粗粒土强度特性及颗粒破碎试验研究  

EXPERIMENTAL STUDY ON STRENGTH AND CRUSHING BEHAVIOR OF COARSE-GRAINED SOIL

作　　者：王子寒[1] 周健[1] 赵振平[1] 张姣[2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海城市管理职业技术学院土木工程与交通学院,上海200432

出　　处：《工业建筑》2013年第8期90-93,14,共5页Industrial Construction

基　　金：国家自然科学基金项目(41272296)

摘　　要：利用大型多功能界面剪切仪对粗粒土进行大型直剪试验,并针对粒径范围在20～50 mm及10～20 mm的特殊试样进行两组对比试验,对粗粒土的力学特性及强度参数进行分析;试验结束后对所有试样进行颗粒筛分,总结颗粒破碎规律。结果表明:粗粒土属于剪切硬化型材料,不良级配材料强度非线性特性明显,呈现较大假黏聚力,摩擦强度变化较小;筛分分析表明,颗粒破碎率随法向应力增加明显增大,二者符合双曲线关系,其拟合参数与级配及颗粒尺寸等密切相关。A series of direct shear tests on coarse-grained soil were performed by large multi-function interface shear apparatus.Two sets of comparative shear tests on special sample with particle diameters of 20~50 mm and 10~20 mm were also performed.Then,the mechanical behaviors and strength parameters of coarse-grained soil were analyzed.After the tests were over,all the samples were sieved,and the particle crushing laws were concluded.The results showed that the coarse-grained soil in shearing tests was a hardening material.The non-linear behaviors in strength and sham cohesions in bad gradation samples were observed.However,there were few changes in frictional strength.The sieving results showed that crushing rates increased obviously with the increasing normal stresses.There were hyperbolic connections between crushing rates and normal stresses.Their fitting parameters were closely related to gradations and particle sizes of the samples.

关 键 词：粗粒土 强度特性 颗粒破碎 直剪试验 

分 类 号：TU411[建筑科学—岩土工程]