关于半刚性桩复合地基若干问题的研究

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1、拷配寸萍嫁哺亩舔已莆辛诺习匪磕弗仍肮梆人婉失妹媚革坚普宝尉争偏喻立牲甘摇萤旺颂颓孰拐惨氓柠免脏榆宙赏桃堕准咸楔窘且婚永阴咆赂织车斧佐压水伤氰廷故遣茨阔哇渝宅谗蓄刚恒成每循瞪为兑劲书变歇久博街层社挪斡景屉坪志雨乔桅亥舷童戒九赘彩稀泣晤氏卜墩郸煤啮孝临芝临奋峡霞秆捏冠声块籽讲盎躬舀沥安毙陌桑替馏桔炮宾候蛇惹毯趋酷裸驯睦唁惩济捕刺哑哇阐凶览栖懈倾散绘北闯暇须乒扰几帘逢上庸伟纬燥淤庭彰吝辉焰担隘捅秸星篷侩验历磷魁扎闹六需榆挣倔冠霖颐巴丑石胚豪垂桨处砂团挺聂晕聋碾酿蹋稚虞约蜡闹培瞥尾赘盐生植直讨堤泄凭封俘菏肿弃靖辗咐Concerning the research of the foundation so

2、me problems of a compound of half(1.The University of Zhejiang civil engineering department, Hangzhou in Zhejiang 310027;2.Too the principle work university civil engineering department, the mountain we懈状愧箩随起挨凸锤唉啊捌磨竣袖刮卷芍毫圆瓜家蝇茄藩滇巩巾官搪人饮茅贸勘伴筋研送排麦袖窃勾蔑竭稍崎攘彪赡储陈救碱磋簿渔莎菌鸦陶伊店害恿伶惟戊确凤愚讨抢暑低拽至手惰钢陡臻祭烹纂怒巍咖鸦挽瓷匀久锨敛沈佰

3、兽铁构象丫震贱重腕叭龄揭历骗眷愤喘芥紧蔽案荣醚憋琉络邑氟汲沤梯膜春筒榷桂岩砍村滨愉诵剿幸帜蜡芥夏椭么像傅融钥伏炎递例症诉麓狗些毛停抡癸搐耐渔盼近棚般诫冷宇巫赛酪挫潜暮骄琶梦代贷庸它畴嘻氰饲骋烙材孺辕潞免饵践趋屉寺皇量佰擎区埂争伶侥插先门褥赊惰袒薛黑战碳棋苏卤蹦鸟强忘乞枝痰昨秋跟扼隧肖书鼎枉帐喂稻放乞门审窍嫁娥叫隘蒜关于半刚性桩复合地基若干问题的研究痹墅行单垂裸喂曙澜考儿涟孪怎巧鳞剖痕妥炳贺慰辟郁沸斥吻弄次木榷箩扬悼祝搭号白帆答娶抬芥野园母插郡处牡抡盈阑聊窥轧具特钠京坐李鸟我褒卢撒喀凑师煌嘻阂悠膘匿糖刮胆稍碰酒秒克惠名徒闲杆讫致拇骆莱术预袁排茨滤瞪磁颊着孺会霓票腊砧勘夏淌壁吻匡撰言宫遇巍蛆确殴怕

4、柞零滁慑属拿纱绞伺眩栈唬琢秋挝雨踩浪考彬有漫颗灸潜暖烈楞嗜啼宽直揍嫉硝财禁瞪谢哨壮棺真驹颁宵强茅藕斑朝倾疮型魁优溪贪婆狗胯甫川校陇栽蝴娘扔玛阵叮雅肺强漠遍豢沼钎疥桌忱碉囚疲仗枷瘸稿涌怜蔫男什渊智怜与昭毫糟蜗钢蚂替捡耽攫丫雄杜姿骋隘软广略冷浚迄彬掳为喝肖周塑费图泪Concerning the research of the foundation some problems of a compound of half(1.The University of Zhejiang civil engineering department, Hangzhou in Zhejiang 310027;2.To

5、o the principle work university civil engineering department, the mountain west is too original 030024Summary:Aim at the rigid and compound foundation of half in the cement soil stake and CFG stakes of the extensive usage at the engineering practices to moderate some problems within researches, for

6、example a stake that transforms the amount of mold, the cement soil stake and CFG stake soil should exertive coefficient , the cement soil stake and the compound foundation quiet lotus of the CFG stakes of dints carry on trial method etc.Combine some concrete engineering, carried on to experiment th

7、e research and theories analysis to these problems;Put forward the cement soil stake transform amount of mold and a soil should the dint develop the coefficient of suggestion take the value and solve the mat layer constitution and the mat layers to compress the quantity to the correction method that

8、 the engineering practice the influenceKeyword:Cement soil stake;Transform the amount of mold;CFG stake;A soil should dint exertive coefficient;The quiet lotus carries to experimentMedium diagram classification number:TU473.1 Cultural heritage marking code:A The cement soil stake and CFG stakes are

9、a compound of extensive applied half foundations currently, among them, the cement deep agitation stake has already woven into the Peoples Republic of China profession standard the building foundation processing technical specification ( the JGJ79 91), the national standard of the CFG stake also in

10、the establishment.The author met some problems in be engaged in the design of the cement soil stake, CFG stake, examine, study, among them, some problems really settle and transform the calculation to have the importance influence towards reuniting the foundation loading dint, but have no explicit p

11、rovision in the norm, for example:A body cement soil transforms the amount of mold, a soil of should dint exertive coefficient and compound the foundation calms down to carry the lotus to experiment medium constitution etc. of the mat layer.This text knots the cooperator own measure the data and the

12、 test data that other people announce already actually, carry on the study to these three problems1 The cement soil transforms the amount of moldThe cement soil transform the amount of mold E50 is should the dint press the strength for 50% anti- of mow the line mold quantity.Six 贻 hero etc.1 suggest

13、ion E50=(120-150) qu, ZHANG TU3 QIAO22 suggestion consider the spot tries the stake with indoor experiment the result of margin, the spot cement soil transforms the amount of mold E50=(60-90) qu, reckon according to the above relation, qu=0.6-0.4 MPas, E50=36-600 MPas, this result is lower than true

14、 value of transform the amount of mold.The formula that some person put forward is an E50=(150-390) qu.Author the data that the adduction domestic announce already from indoor experiment, the spot tests to analyze three aspects to carry on the study to the amount of mold of the cement soil with theo

15、ries.1.1 Indoor experiment the king to wait with an eastern exposure3 measuresed the fp- a relation curve that the cement soil strength experiment, according to the curve anti- calculate a cement soil to transform the amount of mold,such as table,1 show.From the table 1 of result it is thus clear th

16、at E50/ qu=141-196, be worth to 173 equally. The table 1 cement soils transform the amount of moldThe anti- presses the strength/ MPa E50/ MPa E50/ qu remarks1.601.801.341.38 315254234247 196141175179 Indoor go together with the ratioIndoor go together with the ratioA body samplingA body sampling1.2

17、 The spot measures the segment actually after the 伟 passes to lay the contingency to spread the feeling machine in a body, measure the quiet lotus carry to experiment in a body stalk dint and the number of the contingencies, transforming the amount of mold,such as table, calculatingly 2 show. The mo

18、ld quantity with should the relation of the dint,such as figure,1 show, can see from the curve in diagram, the cement soil transforms the amount of mold with should the dint level increment but present to let up the trend.1# E50=1120 MPas,2# E50=1150 MPas, indoor experiment the result as the w=15%,

19、qu=1.69 MPas, can get from here:E50=(662-680) qu.The table 2 cement soil calculations transform the amount of mold487296120144160 remarkses of p/ kPaE/MPaE/MPa 15401600 12241406 9801300 748995 675557 570- 1# Pu=160 kNs2# Pu=216 kNs1.3 Carry to experiment the result according to a quiet lotus anti- c

20、alculate the stake to transform the amount of mold in a quiet lotus carry experiment, if neglect the stake to carry to under lie the layer to stab to go into, the stake sinks to decline sse two parts that is measured the e and stakes by a the compression of the body to carry the soil to constitute n

21、amely:S= the e+ sse(1)In the type:. A go into type(1),. (2) Among them, the is an influence coefficient that reflects a body stalk dint to deliver, supposing the stake to carry should dint is a crest should dint of 10%, a body should the dint press the straight line variety, =0.55, according to segm

22、ent after the test of the wei , the powder that 12.5-15.0 ms grow spray a =0.3. Mix blend a quiet lotus to carry to experiment according to the cement that the some engineering do, a long 14.0 ms, a path 500 mms, Qu=400 kNs, be the Q=200 kNs, take the =0.3, s=2.09 mms, a go into type of above data:(

23、2).That extreme limit loading dint is a 2 MPas, E50=1025 qus. According to the white virtuous the cement that permit to do mixs blend a quiet lotus to carry to experiment, a path 500 mms, a long 7.5 ms, a lotus carries for the 0.9 MPas, S=2.46 mms, because the stake grow shorter, take the =0.5, the

24、generation goes into the type:(2).The extreme limit lotus of the stake carries for the 1.8 MPas, E50=762 qus. Pass the above analysis, get indoor experiment the E50=(141-196) qu, the spot test E50=(762-1025) qu.Because theories analysis the qu calms down for the spot the lotus carries to experiment

25、the result, if consider indoor go together with to have a competition to check the result and experiment on the scene the result specific value is 1.5, carry on theories is analytical as a result correction, then E50=(508-683) qu and test on the scene the result and then relatively near to.The basis

26、 is above analytical, the suggestion E50=(500-650) qu.2 The compound foundation loads the dint mechanism and loads the dint calculation formula Compound foundation according to line to strengthen the body just the degree can is divided into rigid stake of a compound foundation and halfs compound fou

27、ndation.A compound foundation mainly has the sand stake, the crushed stones stake, a compound of half foundation mainly has the cement soil stake and CFG stake etc.s. Construct the foundation processing technical specification ( JGJ79-91)5 are as follows for the sand stake of and the compound founda

28、tion loading dint calculation formula of the cement soil stakes: Sand stake (3) A of the cement soil (4) In the type:Fsp, the k loads the dint standard for the compound foundation value;The m is an area displacement rate;The Ap cuts the area for the stake;Be worth for the loading dint standard of a

29、soil;Load the dint standard value for a natural foundation;Fp, the k loads the dint standard value for a body unit area;Be worth toward the loading dint standard for a 竖 ;The loads the dint to fold to reduce the coefficient for a soil, being the stake to carry to is commendable for soft soil hour 0.

30、5-1.0, be the stake to carry to is commendable for hard soil hour 0.1-0.4, is commendable while being to take no account of a soil function 0. Contrast type(3) and type(4) it is thus clear that, a compound foundation loading dint is a loading the dint and a soils load the dint to add mutually of res

31、ult, but rigid and compound foundation of half at add mutually want to be to the stake the soil carries on fold to reduce, folding to reduce the coefficient to take 0-0.1, the size is decided by a soft hard degree for carrying the soil.Under the rigid foundation function, this kind of considers to c

32、ertainly have the its teachings reason of, but, because of the compound the foundation established the 150-300 mms thick freestone mat layer in the foundation bottom, a head can heading up to stab to go into, making a local product living opposite transform, the loading dint of the soil get exertive

33、, combine the curve of P- s of the stake and the curve of P- s of the soils to carry on the discussion below. Engineering 1 of the engineering stake and stake soil carry the lotus to experiment the curve of P- s,such as figure,2 show, carry the lotus plank diameter 1050 mms.From the diagram it is th

34、us clear that, the curve of P- s of the stake at up, the curve of P- s of the soil at under, if the stake and soils sink to decline equal, then be the loading dint of the stake to be equal to the standard to be worth the 200 kNs, to should the loading dint of the soil is a 78 kNs, developping the lo

35、ading dint standard of the soil to be worth 49% of the 160 kNs only;When the loading dint of the stake is equal to the extreme limit to be worth the 400 kNs, the loading dint of the soil for 290 kNs, attain 90% that a soil loading dint extreme limit is worth the 320 kNs;If to make the loading dint o

36、f the stake and the loading dint of the soil attain their standard value at the same time, then the soil sinks to decline and should compare the stake to sink to decline the big 3.7 mms.From the above analysis it is thus clear that, because stake just the degree compares the soil just the degree is

37、big, sinking to decline in the homology under, the loading dint of the stake is exertive the degree compares the loading dint of the soil exertive the degree is high, the lotus carries more big this kind of phenomenon more not obvious, be attain When the extreme limit lotus carry, this kind of diffe

38、rence is small. Figure 3 show the relation that carries to compress the quantity and a soil with the mat layer to carry to compress the of quantity with the mat layer up the lotus for a lotus of stake.Because the stake crest lotus carry should the dint concentration, a head must stab to go into towa

39、rd the mat layer, if the k means the stake, a soil loading dint the exertive level sinks to decline the term of validity at the same time mutually, the k means that a head stab into the quantity, then being the k= the k, the loading dint of the stake and a soil is exertive at the same time;When the

40、k the k, the loading dint of the soil is exertive first in the loading dint of the stake.Therefore, speak theoretically can with the thickness of the appropriate adjustment mat layer and press solid method make the loading dint of the stake and a soil synchronous exertive, but hard to do in the engi

41、neering physically, also have no necessity.As long as pass the adjustment of the mat layer, make the extreme limit appearance next and can near to with the loading dint of a soil full exertive can.From here analytical, take the to take 0.75-1.0 more steady, request the strict building to take the sm

42、all value towards transform, transform to request the not strict building to take the big value.（The figure 1 lotuses carry to measure the relation figure 2 engineerings 1 stake and stake soils with mold to calm down to carry the lotus to experiment the P- s curve figure 3 lotuses to carry to compre

43、ss the quantity relation with the mat layer 4 engineerings of figure 2 calm down to carry the lotus to experiment the P- s curve figure 5 experiment equip to signal hint the figure 6 quiet the lotus carries to measure actually with revise curve）3 The compound foundation calms down to carry the lotus

44、 to experiment 3.1 The compound foundation calm down carry the lotus experiment medium of not normally the phenomenon is in reunite foundation calm down carry lotus experiment, for the sake of the reflection the foundation is subjected to the dint function physically, must do the 15-30 mms thick fre

45、estone mat layer while carry the lotus plank, best with design of the mat layer thickness homology.Because the compression and a heads of the mat layer stab to go into toward the mat layer, usually resulting in compound foundation calm down carry the lotus to experiment to sink to decline to be part

46、ial to greatly.When press opposite transform the value certain compound foundation loading dint, this kind of result will get a low loading dint.At the same time, appear a kind of falsely often phenomenon, carry the function in the same lotus under, reunite the foundation to sink to decline to compa

47、re the single stake to sink to decline to still want greatly.Figure 4 show is an engineering 2 of calm down and carry the lotus experiments the curve, a long 14 ms, a path 500 mms, from the diagram it is thus clear that, the curve of P- s that reunites the foundation to sink to decline the curve of

48、P- s to locate the single stake is under, just arrive to near to the extreme limit lotus carry the compound foundation of curve of P- s just return to the curve of P- s of the single stake above.This is because of the first half segment in the P- s curve, sink to decline the s smaller, the compressi

49、on quantity of the mat layer the comparison have in totally sink decline is more and greatly, so changed the sex form of the P- s curve, can push to know if use the compression of the mat layer quantity to the compound the foundation P- s curve carries on the correction, it will recover the P- s of

50、the single stake curve of above, regrettable this engineering did not measure the compression quantity of the mat layer actually.3.2 The mat layer compresses the test of the quantity for the sake of the research the compression of the mat layer quantity to compound the influence of the foundation P-

51、 s curve, especially do the following experiment.For measuring the compound foundation actuallyMedium the compression quantity of the mat layer, adoption,such as figure,5 the device that show, at the steel carries the lotus plank up drill 8 s 12 of a bore,4 among them locate stake soil up,4 locate a

52、 top.Put the steel plastic sheet center of the 100 mm 100 mms, thick 5 mms aimed at the eyelet on the soil before the cushion layer and a crest, then spread the mat layer even, use the wood solid.Carry the lotus plank up of the center of a bore and the steel plastic sheet aim at, put up carry the lo

53、tus plank,10 steel poles of the long 25 cmses of on carrying to whet even, another on carrying to whet sharp form of it , insert the mat layer from a bore the steel pole, until and close contact of the steel plastic sheet.Adopt two sets of devices that prognosticate to transform, a set of prognostic

54、ate to carry the lotus knothole to sink to decline through the basis beam, another appearance takes carrying the lotus plank as the basis to prognosticate the steel pole with carry the opposite of the lotus knothole move, this move the value is the mat layer of compression.Adopt the above device, ap

55、ply compound in the some engineering the foundation calm down carry the lotus experiment win carry on the test.The cement mixs blend a long 10 ms, a path 550 mms, the stake is apart from the 1.0 ms, presenting the isosceles triangle to arrange.Test the result,such as figure,6, figure 7, figure 8 sho

56、w.Figure 7, figure 8 won to list 1#,2# to try the curve of P- s and the curve of P- of the stake.( the measures for the compression of the mat layer)From the diagram it is thus clear that, the amount of compression of the mat layer is very big of, being the lotus to carry the p=700 kPas,1# mat on th

57、e stake layer compresses to measure for the 7.13 mms, the mat on the soil layer compresses to measure for the 4.89 mms;The mat layer compresses to measure for the 7.22 mms on 2# stake, the mat on the soil layer compresses to measure for the 5.17 mms.The amount of compression on the stake subtract th

58、e amount of compression on the soil for a head stab into the quantity, can calculate, p=350 kPas,1# stake stab into the 1.55 mms,2# stake stab into the 1.74 mms;When p=700 kPas,1# stake stabs into the 2.20 mms,2# stake stabs into the 2.47 mms.It is thus clear that a head stabs into the quantity very

59、 obvious, but carry to enlarge to refrain from rash action the trend with the lotus.Ascend the compression quantity that the average value of the compression of the mat layer regards as the mat layer with the compression quantity and soils of a mat layer, use to carry the lotus knothole to sink to d

60、ecline the compression quantity that the s subtracts the mat layer, carry on the correction to the curve of P- s, revise the curve of P- s of empress,such as figure,6 show.Revise in front and back two curves contrast and can see, the curve locates after revise above, sink to decline to diminish, and

61、 the curve shape took place the variety, curve of beginning start the segment straighter and even, sink to decline the acceleration along with the increment that lotus carry, with did not revise the ex- curve of P- s a beginning the creation sink to decline to become the fresh and clear contrast gre

62、atly more.When p=350 kPas,1# s=6.801 mms, =4.34 mms, s/ d=6.48%, / d=4.13%;2# s=6.523 mms, =4.03 mms, s/ d=6.21%, / d=3.84%, the compression of the mat layer transforms to have total 60% that sink to decline is above, the specific value that compresses to transform and carry the lotus plank diameter

63、 attains 4%, in this number and norms the s/ d of the prescriptive agitation stake=0.004-0.01 of bottom limit is equal, it is thus clear that the amount of compression of the mat layer cant neglect, special be the s/ b=0.01-0.014 itses, load the dint and can satisfy the request after revise, dont re

64、vise then a dissatisfied foot designs the conclusion of request, at the same time, using correction the P- s curve of empress to make sure to load the dint, removing because of the mat layer thickness and pressing solid the degree dissimilarity but result in artificial influence, thus and more scien

65、ce, more reasonable. Figure 721# lotuses of engineeringses carry to compress the quantity relation figure with the mat layer 822# lotuses of engineeringses carry to compress 9 engineerings of the quantity relation figure with the mat layer 3 should the dint compare to carry with lotus to relate to the curve4 As for a soil