基于SMP准则的改进剑桥模型及其在基坑工程中应用  

Revised Cam-clay model based on SMP criterion and its application to foundation engineering

作　　者：连镇营[1] 韩国城[1] 姚仰平[2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]北京航空航天大学土木系,北京100083

出　　处：《大连理工大学学报》2002年第1期93-97,共5页Journal of Dalian University of Technology

摘　　要：基坑开挖时坑底土体在卸荷作用下会处于三轴拉伸状态 ,剑桥模型采用的扩展 vonMises准则将高估土体的三轴拉伸强度 ,因此利用变换应力法将剑桥模型从三轴试验的轴对称应力状态扩展至一般应力状态 .改进后的剑桥模型采用 SMP准则能较好地反映基坑工程中坑底土体在三轴拉伸状态下的强度和变形特性 。Research shows that the soil on the bottom of excavation is sometimes the triaxial extension state under the unloading condition, so the extended von Mises criterion used by Cam Model grossly overestimates strength in triaxial extension. and predicted result is erroneous as the soil at the bottom of excavation takes on large tension stress. In our paper, the Cam Model is extended to the three-dimensional model by the transformed stress method. which adopts SMP failure criterion and can well reflect the strength and deformation characteristics of the soil in triaxial extension. The predicted heave displacement is more reliable.

关 键 词：基础工程 剑桥模型 三维化 基坑工程 SMP准则 三轴拉伸强度 变形预测 土体 

分 类 号：TU435[建筑科学—岩土工程] TU753[建筑科学—土工工程]