基坑底强夯对侧壁稳定性影响的数值模拟研究  

Numerical simulation of effects of foundation bottom dynamic compaction on the stability of soil-nail supported excavation wall

作　　者：吴燕开[1,2] 胡晓士 胡锐[2] 石玉斌[2] 赵位莹 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《中国科技论文》2017年第13期1537-1542,共6页China Sciencepaper

基　　金：山东科技大学科研创新团队支持计划项目(2015KYTD104)

摘　　要：为降低强夯施工风险并评估其造成的影响,对某工程基坑侧壁稳定性受强夯振动的影响进行数值模拟。结果表明:随着夯击能和夯击次数的增加,在侧壁底部首先出现塑性区,随后顶部向基坑内滑移并带动土钉发生旋转;夯击能为500kN·m以下的强夯施工不会对基坑的稳定造成影响;当夯击能大于1 000kN·m时,随着夯击次数的增加,基坑侧壁会整体向坑内滑移。通过模拟结果可进行指导施工,并对基坑侧壁稳定性进行有效控制。To reduce the construction risk and evaluate its influence, the numerical simulation on stability of the sidewall of a foundation pit against dynamic compaction vibration was performed in this study. The simulation results showed that plastic zone firstly occured at the bottom of the sidewall with the increase of the tamping and ramming times, then the top is sliding to the foundation pit with the rotating of soil-nail. When the dynamic compaction capacity was below 500 kN · m, it will not affect the stability of the foundation pit. When ramming energy is above 1 000 kN · m, the sidewall of the pit will slide into the pit as a whole with the increase of number of tamping. The construction can be guided with simulation results and stability of the sidewall of the pit can be effectively controlled.

关 键 词：基坑 强夯 有限元 夯击能 夯击次数 侧壁变形 

分 类 号：TU433[建筑科学—岩土工程] TU753.8[建筑科学—土工工程]