砾石土强度和变形的平面应变试验研究  

Test of plane strain and study on of strength and deformation of gravel soil

作　　者：陈鸥[1,2] 左永振[2] 孔宪勇 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《人民长江》2010年第9期69-72,共4页Yangtze River

摘　　要：平面应变试验至今仍属于非常规试验。采用新研制的大型平面应变仪和常规三轴仪对砾石土进行了两组对比试验。由于考虑了中主应力,平面应变试验更加逼真地模拟了工程实际。试验结果表明:①平面应变试验验证了土体的非线性、应力硬化特性和剪缩性;②对于平面应变问题,实际工程在选取强度指标时,可采用稍高于三轴试验测得的强度指标;③由广义胡克定律推导的,用大主应力与中主应力算出的泊松比仅为土体固有泊松比的弹性部分。Plane strain test is still non-conventional test until now.We conducted and compared two groups of tests with gravel soil by a new developed plane strain apparatus and normal triaxial apparatus.As considering the intermediate principal stress,the result of plane strain test is more closed to the practical projects.The test results indicate： ① plane strain test confirms the nonlinear feature,stress-hardening feature and dilatancy;② for plane strain in practical project,the larger strength index than the test result by triaxial test can be selected;③ according to generalized Hooke law,Poisson ratio calculated by large principal stress and intermediate principle stress is the elastic part of the inherent Poisson ratio of soil.

关 键 词：平面应变仪 应力应变 体变 中主应力 抗剪强度 泊松比 

分 类 号：TV641[水利工程—水利水电工程]