深基坑扩大头锚杆支护体系数值模拟  

Numerical Simulation on Expanded Anchor Rod Supporting System for Deep Foundation Pit

作　　者：林观茂 张丽娟[1] 温忠义[2] 

机构地区：[1]广东工业大学土木与交通工程学院,广州510006 [2]广州市城市规划勘测设计研究院,广州510060

出　　处：《路基工程》2015年第5期92-98,111,共8页Subgrade Engineering

摘　　要：为了研究广州某深基坑工程扩大头锚杆支护体系的工作性状,运用MIDAS/GTS软件对该支护体系进行了有限元数值模拟,并与相同情况下的普通锚杆支护体系的有限元模拟结果以及实际监测结果进行了对比分析。结果表明:与普通锚杆相比,扩大头锚杆的锚固效果较好,基坑支护桩桩顶的水平位移较小,支护桩附近的坑底土体隆起较小,坑外地表土体沉降较小。扩大头锚杆由于端部扩大而使锚固力增大,使得轴力在锚固段处最大值比较大,且在扩大头锚固段处能迅速减小。To study the behavior of bit expanded anchor Guangzhou, finite element numerical simulation was made rod supporting system for a deep foundation pit in on this supporting system with MIDAS/GTS, and its result was compared with the results from the FEM simulation of common anchor supporting system under the same condition, and the actual measurements, respectively. The result of the analysis shows that, compared with common anchor rod, expanded anchor rod has better anchorage effect so that the pit support pile has smaller horizontal displacement on the top, the uplift of soil at the pit bottom is small near the support piles, and the soil mass on the surface outside the pit has less down moving. The expanded anchor rod, due to its expanded end, has the anchoring force increased, thus allowing the axial force to get larger peak value at the anchorage section and decrease rapidly at the anchorage section of the expanded head.

关 键 词：基坑工程 桩锚支护 扩大头锚杆 数值模拟 

分 类 号：TU473.2[建筑科学—结构工程]