摘要
以济南市槐荫区某基坑工程进行双排桩支护设计为例,分别采用有限差分数值软件中弹塑性实体单元和线性桩单元模拟开挖-支护-施工全过程,且考虑桩土相互作用并进行三维动态分析。对基坑坡面水平位移、桩身弯矩、桩身剪力等变化规律进行研究,分析双排桩支护体系的受力机理。通过土体力学参数、桩径、桩长、桩距、连梁等设计参数对基坑变形影响的敏感性进行对比,并就"实体"和"结构"单元桩的计算结果进行比较。研究表明,模拟过程能较好展示双排支护桩施工过程的受力机理,且计算精度较高;不可控参数中土体的黏聚力、摩擦角以及可控因素中的桩身长度、排桩距离等对支护效果影响较大,计算结果可为双排支护桩设计参数选取提供参考。
This manuscript took the design of double-row pile support for a foundation pit project in Huaiyin District of Jinan City as an example. Elastoplastic solid elements and linear pile elements in finite difference numerical software was used to simulate the whole process of excavation-support-construction. The pile-soil interaction was taken into account and three-dimensional dynamic analysis carried out. In this paper, the design parameters of soil mechanics parameters, pile diameter, pile length, pile spacing, and coupling beam used to compare the sensitivity of foundation pit deformation. The calculation results for the "entity" and "structure" unit piles used for comparison. The research showed that the simulation process could better show the force mechanism of the double-row supporting pile construction process, and the calculation accuracy was high. The cohesive force, friction angle of the soil and the length of the pile and the distance of the pile in the controllable parameters had a great influence on the support effect. The calculation results could provide a reference for the selection of design parameters of double-row support piles.
作者
高阳
孙浩凯
刘日成
GAO Yang;SUN Haokai;LIU Richeng(Chongqing Rail Transit( Group) Co.Ltd.,Chongqing 401120,Chongqing,China;Hebei Province Key Lab of Structural Health Monitoring and Control,Shijiazhuang 050043,Hebei,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《山东大学学报（工学版）》
CAS
CSCD
北大核心
2019年第3期86-94,共9页
Journal of Shandong University（Engineering Science）
基金
国家自然科学基金委青年基金资助项目(51608336)
中国博士后科学基金面上基金资助项目(一等)(2017M610170)
重庆市博士后研究人员特别资助(二等)(Xm2016015)
河北省高等学校科学技术研究青年基金资助项目(QN2016080)
西藏科技计划项目(XZ201801-GB-07)
关键词
双排支护桩
桩土相互作用
敏感性分析
实体单元桩
结构单元桩
double-row supporting piles
interaction between soil and pile
sensitivity analysis
entity unit pile
structural unit pile
