摘要
细粒尾矿在堆坝过程中由于尾矿坝高度不断增大,其固结度也在不断改变,相应的抗剪强度指标也随之改变,抗剪强度指标对堆积坝的稳定性分析至关重要。对尾矿砂进行相应的固结试验及直剪试验,以及不同压实度下的直剪试验,推导了固结度与压实度之间表达式。结果表明:随固结度增大,土体粘聚力减小而内摩擦角增大;随压实度增大,粘聚力及内摩擦角均有增大趋势;尾矿砂固结度与压实度之间满足一定的关系。不同固结度下尾矿抗剪强度指标可以方便地通过不同压实度下的直剪试验获得。
Due to the increasing height of the tailings dam during the stacking process, the consolidation degree of fine-grained tailings is constantly changing, and its corresponding shear strength index is also changing, and the shear strength index is very important for the stability analysis of the accumulation dam. In this paper, the expression between the degree of consolidation and the degree of compaction was derived by the corresponding consolidation test and direct shear test of the tailings sand, as well as the direct shear test under different compaction degrees. The results show that with the increase of consolidation degree, the cohesion of soil decreases and the internal friction angle increases;with the increase of compaction degree, the cohesion and internal friction angle have a tendency to increase;the relationship between the consolidation degree of tailings sands and the degree of compaction is satisfied. The shear strength index of tailings under different consolidation degrees can be easily obtained by direct shear test under different compaction degrees.
作者
刘建永
LIU Jianyong(China Railway Construction Group Co.Ltd.,Beijing 100040,China)
出处
《铁道建筑技术》
2023年第1期12-15,共4页
Railway Construction Technology
基金
中铁建设集团有限公司科技研究开发项目(LX22-11b)。
关键词
尾矿
固结度
压实度
粘聚力
内摩擦角
tailings
degree of consolidation
degree of compactness
cohesion
internal friction angle
作者简介
刘建永(1981-),男,河北阜城人,高级工程师,硕士,主要从事工程管理,E-mail:648387391@qq.com。
