双排桩支护结构土压力数值模拟研究.doc

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-rowpileretainingstructuresNIUShuangjian1YANGDafang2MAHuan1(1.SchoolofArchitecture&CivilEngineeringChinaUniversityofMiningandTechnologyXuzhou221008China;2.SchoolofCivilEngineeringHenanPolytechnicUniversityJiaozuo454003China)Abstract:Double-rowpilesupportingstructureisanewformofdeepfoundationditchsupportinthisdesignthecorrectnessofthevalueofsoilpressureonthepileplaysacriticalroleinsupportingsystemdesigninordertomoreaccuratelytodesignthisstructurewemustknowaboutthesoilpressuredistributionofthedouble-rowpilethispaperusingthegeneralinternationalgeotechnicalengineeringanalysissoftwareFLAC3Dthroughnumericalsimulationmethodsstudysoilpressuredistributionofthedouble-rowpilecometotheconclusionthatthesoilpressurebeforeformerrowpilewasroughlyS-shapeddistributionitsvaluewasclosetothestaticsoilpressure;thesoilpressurebehindformerrowpliewasconsistentwiththestaticsoilpressureupwardoftheexcavationoffoundationditchwaslessthanthestaticsoilpressureandgreaterthantheRankinesoilpressureundersideoftheexcavationoffoundationditchwasgreaterthanthestaticsoilpressure;thesoilpressurebeforerearrowpilewasroughlylineardistributionandconsistentwiththestaticsoilpressureupwardoftheexcavationoffoundationditchwaslessthanthestaticsoilpressureundersideoftheexcavationoffoundationditchwasgreaterthan