统一强度理论在地基承载力确定中的应用研究  

Research on application of unified strength theory to determining of bearing capacity of foundations

作　　者：隋凤涛[1] 王士杰[1] 

机构地区：[1]河北农业大学城乡建设学院,河北保定071001

出　　处：《岩土力学》2011年第10期3038-3042,共5页Rock and Soil Mechanics

基　　金：河北省建设科技研究计划(No.2009-114)

摘　　要：基于统一强度理论,考虑中间主应力对地基承载力的影响,给出了静止侧压力系数K 0≠1条件下的地基临塑与临界荷载公式。结合实例,对基于统一强度理论和Mohr-Coulomb准则的地基承载力计算结果进行了对比分析。新的理论公式更为确切地反映了地基承载力的实质,有利于地基土体强度的充分发挥。基于河北境内177组不同土质地基的土性指标及载荷试验资料的统计分析,对中间主应力系数b的取值进行了深入细致的探讨,研究表明,对于粉土及黏性土地基,b的取值范围在0～0.5之间变化,理论计算所得地基承载力特征值与载荷试验实测值间的相对误差一般不超过5%。Based on the unified strength theory,a new formula of critical edge pressure and critical load of subsoil considering the effect of intermediate principal stress ？2 and the static lateral pressure coefficient is deduced.After contrasting the results of the unified solutions with those based on the Mohr-Coulomb criterion,it is shown that this method can reflect the essentials of foundation bearing capacity more accurately and be conducive to make full use of the strength of foundation.A thorough study of the intermediate principal stress coefficient b has been made through statistical analysis for 177 groups of soil indices and the loading test data of different foundation soils in Hebei province.The result proves that the value of b changes from 0 to 0.50 for the silt and clay soil foundation;and the relative error between the theoretical values of the foundation bearing capacity and the measured values of loading test is generally less than 5%.

关 键 词：临塑荷载 临界荷载 统一强度理论 中间主应力 静止侧压力系数 

分 类 号：TU471.12[建筑科学—结构工程]