基坑应变软化的桩锚支护数值计算  

Numerical calculation for pile-cable reinforcement in strain softening foundation pit

作　　者：刘自由[1] 

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《中南大学学报（自然科学版）》2012年第7期2833-2837,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50774093)

摘　　要：通过理论分析,建立相应基坑应变软化模型,并对桩锚支护过程中的基坑稳定情况和桩锚结构响应进行数值模拟。研究结果表明:利用FLAC3D建立的应变软化模型,能够较好地反映土的特性;基坑安全系数随锚杆长度的增大而呈线性增大;若锚杆的长度较短,则基坑的稳定性受到锚杆倾角的影响较小;锚固力沿杆体方向逐渐减小,最大值出现在锚头位置;随着锚杆长度的增大,锚固力最大值往杆体内移动,并沿杆体呈先增大后减小的趋势;支护桩主要承受压力作用,随着锚杆长度的增大,支护桩所承受的压力逐渐减小;锚杆倾角增大导致支护桩轴向压力逐渐增大。By theoretical analysis, the strain softening foundation pit model was founded, and the stability situation of foundation pit reinforced by pile-cable and its response were numerically simulated. The results show that the strain soften model built by FLAC3D can reflect the characteristic of soil mass; the factor of safety of foundation pit increases with the increase of bolt length; the bolt inclination has little effect on the safety factor of foundation pit, and the maximum anchoring force exists at the bolt head. With the increase of the bolt length, the maximum bolt force moves to the middle of bolt shaft, which causes the anchoring force to first increase and then decrease. The reinforcement pile mainly resists the compression in the axial direction. With the increase of bolt length, the compression along the pile shaft decreases gradually. With the increase of the bolt inclination, the axial compression along pile increases gradually.

关 键 词：基坑 桩 锚杆 稳定性 数值模拟 

分 类 号：TU457[建筑科学—岩土工程]