基于统一强度理论的管桩挤土效应分析  

Analysis of compacting effects of tubular pile based on unified strength theory

作　　者：罗小艳[1] 刘伟平[2] 

机构地区：[1]江西科技师范学院,江西南昌330013 [2]南昌大学建筑工程学院,江西南昌330031

出　　处：《水利水运工程学报》2011年第2期60-64,共5页Hydro-Science and Engineering

基　　金：江西省教育厅科技计划项目(s00164);江西省研究生创新基金项目(YC08A027)

摘　　要：基于统一强度理论和圆孔扩张理论对管桩的挤土效应进行分析,考虑了中间主应力的影响,并得出了相应的桩周土体弹塑性阶段的应力场和位移场等的解析表达式.通过算例分析,探讨了中间主应力对管桩挤土效应的影响程度.结果表明:与Mohr-Coulomb强度理论结果对比,中间主应力对计算结果有显著影响,随着中间主应力参数b的增大,塑性区半径明显减小,孔内最终压力则明显增大,在相同半径处,孔内的径向压力也增大.强度理论中的参数b对塑性区半径、径向位移及应力分布等均有影响.Based on the unified strength theory and the cavity expansion theory,the compaction effects of the tubular pile are studied in this paper.The elasto-plastic analysis solution of the stress field and displacement field of the soil around the pile is given.The relationships between plastic zone,the limit expansion pressure,the radial stresses and the parameter b are also obtained from analysis.According to numerical results,the effect of intermediate principal stress on compaction effects of the tubular pile is examined.A comparative study is made for the present solution and other solutions based on Mohr-Coulomb criterion.The results show that the parameter b in unified strength theory has significant effects on the radius of plastic zone,the magnitude of stresses and displacement.The radius of plastic zone is decreased and the limit expansion pressure is increased,and at the same radius,the radial stress is also increased because of the effect of intermediate principal stress.

关 键 词：统一强度准则 管桩 挤土效应 弹塑性分析 

分 类 号：TU473.1[建筑科学—结构工程]