土抗力法计算深基坑支护桩弯矩及实测分析  

Soil resistance calculating method of deep foundation pit supporting pile and test analysis

作　　者：李建军[1,2] 韩杰 梁仁旺[1] 白晓红[1] 韩云山[2] 

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024 [2]中北大学土木工程系,太原030051 [3]中机国际设计研究院广州分院,广州511340

出　　处：《建筑结构》2010年第3期52-54,共3页Building Structure

基　　金：山西省自然基金项目(2008011055)

摘　　要：通过在基坑支护桩中埋置应力计,跟踪测试基坑在开挖过程中桩身弯矩和桩顶位移的变化,研究支护桩荷载传递规律。同时选择上三角、全三角、梯形三种土压力分布模式,分别应用土抗力法的m法、c法和k法对支护桩的桩身弯矩进行了理论计算,并把计算结果与实测结果进行对比分析。结果表明:对于支护桩弯矩而言,无论采用何种土压力模式,m法的计算结果与实测结果相差较大;k法计算的最大正弯矩与实测值比较接近,但最大负弯矩偏大;c法计算的最大正弯矩偏于不安全,最大负弯矩过大。Load transfer behavior of supporting pile for foundation excavation was studied through testing the change of bending moment of the pile with the deep foundation pit excavation program.Meanwhile,the moment and displacement of the pile were calculated by applying the soil resistance methods m, c and k and selecting earth pressure model of up triangle,triangle and trapezoid.The calculation and test results were compared and it got some conclusions.For the moments,the deviation of the calculation results and test results of the method m is relatively great.The results of the method k are checked fair well with the experimental data,but the maximum negative moment is bigger than measured value.The maximum positive bending moment by the method c is not safe and the maximum negative moment is so great.

关 键 词：深基坑 支护桩 M法 c法 k法 

分 类 号：TU43[建筑科学—岩土工程]