基于试样中部变形的p-q-s空间临界状态面试验研究  

Critical state surface in p-q-s stress space based on deformation of middle part of specimens

作　　者：董建军[1] 邵龙潭[2] 

机构地区：[1]燕山大学建筑工程与力学学院,河北秦皇岛066004 [2]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《岩土工程学报》2009年第10期1607-1613,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金专项基金项目(50527803);国家自然科学基金项目(50608014);河北省自然科学基金项目(E2009000383)

摘　　要：在一系列控制吸力的非饱和压实土三轴剪切试验中,应用数字图像测量技术获得了避开端部效应影响的试样中部1/3区域的强度及变形试验数据。由试验结果对非饱和土p–q–s三维应力空间临界状态面与LC屈服面交线在p–q平面、q–s平面和s–p平面的投影曲线进行了研究,进而全面地描述了非饱和土三维应力空间中的临界状态面的合理形态,修正了Alonso模型中的临界状态线表达式并进行了验证。The digital image measurement technique is employed in a series of suction-controlled unsaturated compacted soil triaxial tests to get the strength and deformation test data of the middle part of specimens, avoiding the end effect. The projective shape of the spatial critical state lines on the three two-dimensional planes is further discussed, and the rational critical state surface shape of the unsaturated soil in the three-dimensional p-q-s space is fully demonstrated. The formula expression of the three-dimensional critical state surface in Alonso model is improved and also validated by use of the related data.

关 键 词：非饱和土 吸力 三轴试验 数字图像测量:临界状态面 

分 类 号：TU43[建筑科学—岩土工程]