期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
大采高综采工作面煤壁位移及控制技术研究 被引量:2
1
作者 张蓓 《矿业安全与环保》 北大核心 2014年第2期45-48,共4页
为了有效控制大采高综采工作面煤壁的位移,以某矿504工作面为研究背景,利用理想弹塑性应变软化模型,建立了大采高工作面煤壁位移的计算模型,得出煤壁表面各点的位移解;建立了大采高工作面数值计算模型,模拟分析了不同采高时工作面煤壁... 为了有效控制大采高综采工作面煤壁的位移,以某矿504工作面为研究背景,利用理想弹塑性应变软化模型,建立了大采高工作面煤壁位移的计算模型,得出煤壁表面各点的位移解;建立了大采高工作面数值计算模型,模拟分析了不同采高时工作面煤壁表面的位移及塑性区变化规律,得出煤壁片帮主要发生在煤壁中上部。根据大采高煤壁片帮的机理,从改进机械装置、优化采矿技术等几个方面提出了应对措施。 展开更多
关键词 大采高 综采工作面 片帮 弹塑性应变软化
在线阅读 下载PDF
An elasto-plastic constitutive model incorporating strain softening and dilatancy for interface thin-layer element and its verification 被引量:1
2
作者 彭凯 朱俊高 +2 位作者 冯树荣 王荣 刘汉龙 《Journal of Central South University》 SCIE EI CAS 2012年第7期1988-1998,共11页
The mechanical behaviors of the interface between coarse-grained soil and concrete were investigated by simple shear tests under condition of mixed soil slurry (bentonite mixed with cement grout).For comparison,the in... The mechanical behaviors of the interface between coarse-grained soil and concrete were investigated by simple shear tests under condition of mixed soil slurry (bentonite mixed with cement grout).For comparison,the interfaces both without slurry and with bentonite slurry were analyzed.The experimental results show that different slurries exert much influence on the strength and deformation of soil/structure interface.Under mixed soil slurry,strain softening and shear dilatation are observed,while shear dilatation appears under the small normal stress of the interface without slurry,and shear contraction is significant under the condition of the bentonite slurry.The thickness of the interface was determined by analyzing the disturbed height of the sample with both simple shear test and particle flow code (PFC).An elasto-plastic constitutive model incorporating strain softening and dilatancy for thin layer element of interface was formulated in the framework of generalized potential theory.The relation curves of shear stress and shear strain,as well as the relation curves of normal strain and shear strain,were fitted by a piecewise function composed by hyperbolic functions and resembling normal functions.The entire model parameters can be identified by tests.The new model is verified by comparing the measured data of indoor cut-off wall model tests with the predictions from finite element method (FEM).The FEM results indicate that the stress of wall calculated by using Goodman element is too large,and the maximum deviation between the test data and prediction is about 45%.While the prediction from the proposed model is close to the measured data,and the error is generally less than 10%. 展开更多
关键词 simple shear test mixed soil slurry DILATANCY particle flow code generalized potential theory constitutive model FEM
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部