摘要
分别对含筋层数为1、2、4层的尾矿中砂和细砂进行三轴压缩试验,给出了不同增强层数下尾细中砂的邓肯-张模型参数。2层以下加筋时,土工织物对尾矿砂的横向变形约束作用较小,尾中细砂均表现为剪切破坏特征;在2～4层增强时,尾中细砂均表现为拉应力破坏特征;拉破坏条件下和剪切滑移破坏条件下,均发现加筋后的尾矿,凝聚力随加筋层数非线性增大,而内摩擦角基本不变。定义了增强效果系数,层数与该系数呈非线性关系。轴向应变小于5%～8%时,尾矿砂处于弹性变形阶段;轴向应变大于8%时,出现弹塑性耦合变形。
Tiaxial compression tests are made with different number of geotexile. It gets the parameters of Duncan-chang model for reinforced sand with l, 2 and 4 geotexie layers. When 1 or 2 layers, the geotexile has a little restraint on the sand＇s lateral deformation and the failure mode is shear failure. When 3 or more layers, the failure mode is tensile failure. Under the two failure modes, the existence of reinforced material can influence the cohension force which is nonlinear increase with the layer＇s number, but not the inner friction angle. It defines the coefficient of the enhanced action which has a nonlinear rise according to the layer＇s number. When axial strain below 5%-8%, the sand is at the elastic distortion stage, but elasto-plastictity stage when above 8%.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第12期3784-3788,共5页
Rock and Soil Mechanics
基金
国家自然科学基金面上项目(No.50374042)
山西省科学技术发展计划基金项目(No.20080321068)
关键词
尾矿砂
三轴试验
抗剪强度
土工织物
邓肯-张模型
tailings sand
triaxial compression test
shear strengh
geotextile
duncan-chang model
