疏排桩-放坡组合支护的应用分析  

Application Analysis of Composite Supporting of Scattered Piles and Step-Slope

作　　者：张锡治[1] 何明华[2] 

机构地区：[1]天津大学建筑设计研究院,天津300072 [2]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第9期817-822,共6页Journal of Tianjin University：Science and Technology

摘　　要：针对某基坑放坡开挖不满足稳定性要求的问题,提出采用疏排桩与放坡组合支护的方案.通过有限元强度折减法,分析了疏排桩加设前后的土坡稳定性及疏排桩的位置、桩径、桩距、桩长对土坡稳定性的影响.在给定的目标下统一考虑各因素的影响,根据经济性比较得出优化方案.分析表明有限元强度折减法分析非均质土坡稳定可行,加设疏排桩能加深滑裂面、提高土坡稳定性.工程应用表明疏排桩与放坡组合支护的方案是经济有效的支护方式.A composite supporting of scattered piles and step-slope was proposed to deal with the problem that the slope stability of a step-slope excavation engineering cannot meet the requirement. Numerical analyses were per-formed on the stability of reinforced and unreinforced slope by the finite element strength reduction method. The in-fluence of scattered pile＆#39;s location,diameter,space and length on slope stability was also analysed,and accordingly an optimal scheme was obtained considering all influencing factors under a given target. Analyses show that the finite element method is feasible in analyzing non-homogeneous slope stability is available and that the application of scat-tered pile can deepen the slip surface and increase the safety factor of slope. The application of optimal scheme in the engineering indicates that the composite supporting of scattered piles and step-slope is an economical and effective supporting method.

关 键 词：疏排桩 土坡稳定 强度折减法 有限元分析 方案优化 

分 类 号：TU457[建筑科学—岩土工程]