基于改进伏斯列夫线的超固结土本构模型  

Constitutive model of over-consolidated clay based on improved Hvorslev envelope

作　　者：姚仰平[1] 李自强[1] 侯伟[1] 万征[1] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100083

出　　处：《水利学报》2008年第11期1244-1250,共7页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(10672010);国家基础研究计划(2007CB714203);国家科技支撑项目(2006BAK12B12)

摘　　要：基于作者提出的超固结土的统一硬化模型,本文进一步提出了以抛物线近似代替Hvorslev线的方法,该抛物线将零拉应力线与Hvorslev线表达成一条统一的剪切强度包络线,其在超固结比很大时斜率趋近于3;而对于中度超固结土、弱超固结土,抛物线接近于Hvorslev线;当超固结度为1时,与临界状态线一致。由于对土的潜在强度直接采用抛物线来计算,在模型中没有引用Hvorslev线斜率,故改进后的超固结土模型参数与修正剑桥模型的参数相同。通过对不排水三轴试验和排水三轴试验数据的预测,表明基于改进的Hvorslev线超固结土模型合理可行。Based on the model of over-consolidated clay suggested by the authors, an improved Hvorslev envelope is proposed. The proposed envelope is a parabola which is not only compatible to the high OCR （over consolidation ratio） situation but also closely approximate to the Hvorslev curve in mid-low OCR region. When the OCR is equal to 1, the parabola superposes the critical state line. Because of using the parabola as the potential strength envelope, the slope of Hvorslev envelope Mh is not necessary to be adopted as the parameter anymore. The parameters in the proposed model are the same as those in the Modified Cam-clay model. The comparison between test data and predicted results confirms the rationality of the over-consolidated model based on improved Hvorslev envelope.

关 键 词：Hvorslev线 超固结土 统一硬化模型 土力学 

分 类 号：TU43[建筑科学—岩土工程]