双排桩支护结构土压力数值模拟摘要：双排桩支护结构是一种新的深基坑支护形式，在进行双排桩支护结构设计时，土压力的取值正确与否对支护体系设计是否合理起着决定作用，为了更准确的进行双排桩支护结构的设计必须了解作用在桩上的土压力的分布情况，本文利用岩土工程分析软件FLAC3D，运用数值模拟方法研究了双排桩土压力的分布情况，得出前排桩桩前土压力大致呈S形分布，其值比较接近于静止土压力；前排桩桩后土压力大致与静止土压力一致，基坑开挖面以上小于静止土压力，大于朗肯主动土压力，以下大于静止土压力；后排桩桩前土压力大致呈线性分布并大致与静止土压力一致，在基坑开挖面以上小于静止土压力，以下大于静止土压力；后排桩桩后土压力较接近静止土压力，大于朗肯主动土压力，在基坑开挖面以上小于静止土压力，以下有大于静止土压力的部分；桩间土对前后排桩桩侧的土压力大致相等。在此基础上并考虑了排距的影响，得出双排桩的排距有合理的排距范围。关键词：双排桩；有限差分；土压力；数值模拟中图分类号：TU47文献标识码：ANumericalsimulationonsoilpressureofdouble-rowpileretainingstructuresNIUShuangjian1,YANGDafang2,MAHuan1(1.SchoolofArchitecture&CivilEngineering,ChinaUniversityofMiningandTechnology,Xuzhou221008,China;2.SchoolofCivilEngineering,HenanPolytechnicUniversity,Jiaozuo454003,China)Abstract:Double-rowpilesupportingstructureisanewformofdeepfoundationditchsupport,inthisdesign,thecorrectnessofthevalueofsoilpressureonthepileplaysacriticalroleinsupportingsystemdesign,inordertomoreaccuratelytodesignthisstructure,wemustknowaboutthesoilpressuredistributionofthedouble-rowpile,thispaperusingthegeneralinternationalgeotechnicalengineeringanalysissoftwareFLAC3D,throughnumericalsimulationmethods,studysoilpressuredistributionofthedouble-rowpile,cometotheconclusionthatthesoilpressurebeforeformerrowpilewasroughlyS-shapeddistribution,itsvaluewasclosetothestaticsoilpressure;thesoilpressurebehindformerrowpliewasconsistentwiththestaticsoilpressure,upwardoftheexcavationoffoundationditchwaslessthanthestaticsoilpressure,andgreaterthantheRankinesoilpressure,undersideoftheexcavationoffoundationditchwasgreaterthanthestaticsoilpressure;thesoilpressurebeforerearrowpilewasroughlylineardistributionandconsistentwiththestaticsoilpressure,upwardoftheexcavationoffoundationditchwaslessthanthestaticsoilpressure,undersideoftheexcavationoffoundationditchwasgreaterthanthestaticsoilpressure;thesoilpressurebehindrearrowpilewasclosetothestaticsoilpressure,andgreaterthantheRankineactivesoilpressure,intheexcavationoffoundationditchwasmorethantnestaticsoilpressure,undersideoftheexcavationoffoundationditchwasgreaterthanthestaticsoilpressureinpartofpile,thepressureofthesoilbetweenrowsonpilesidewasroughlyequal.Onthisbasisandtakingintoaccounttheimpactofthearraypitch,wecanconcludedthatthearraypitchofdouble-rowpilehaveareasonabledistancerange.Keywards:double-rowpile,finitedifference,soilpressure,numericalsimulation0引言1高层建筑的蓬勃发展，使深基坑支护新技术不断1收稿日期：2008-03-03作者简介：牛双建（1983-），男，河南省开封市人，硕士研究生，研究方向：深基坑支护，E-mail：sjniu2006@163.com。涌现，双排支护柱形式便是其中之一。双排桩支护形式在一定环境和施工条件下，具有侧向刚度大、能有效限制侧向变形、整体稳定性好、便于挖土和缩短工期等优点[1]，与单排桩相比受力更加合理但也更复杂。目前，对双排桩的研究一般多集中在对桩顶侧移、桩身内力方面[2-6]，很少有文献研究双排桩土压力的分布。由于土压力的取值直接影响桩身的设计，因此，研究双排桩所受土压力分布有重要的工程实际意义。笔者利用岩土工程分析软...
