变水压强作用下顺斜基底排土场破坏机理

Failure mechanism study on maleic oblique-basement dump of variable hydrostatic pressure

针对沟谷河道地带的顺层倾斜基底露天矿排土场开展研究,基于多孔介质流体力学,土力学等基础理论,以河道内作用于排土场一侧的静水压力为研究变量,分析排土场在不同水压作用下及考虑流固耦合效应下的变形破坏机理。对复杂地质条件下的排土场边坡进行建模和网格划分,应用FLAC3D软件计算自重条件下排土场边坡的稳定状态;并在此基础上对排土场在不同压力水头(汛期)作用下的渗流场、应力场分布规律进行计算和比较分析,研究其变形和破坏机理,分析排土场的稳定性与作用静水压强之间的关系。并结合哈尔乌素露天矿排土场工程实例,对所得结论进行分析验证。分析了排土场不同水压情况下的流固耦合效应和稳定性状况,为沟谷地区建设排土场的工程实践提供了理论依据。

According to the research of tilted basement dump of open pit mines in the gully and channel,based on hydrodynamics theory in porous media and soil mechanical theory,this paper considers hydrostatic pressure as an important research variable by acting on the dump in the channel,the deforming law of dump considering fluid-solid coupling effect under the action of various water pressure is analyzed.Based on modeling and mesh generation of waste-dump slope under complicated geological condition and waste-dump slope stability is calculated by Flac3D.The law of seepage field and stress field under the action of various pressure head in dumping site is analyzed and deforming and failing law of dump is studied and the relationship between slope stability analysis of dump and hydrostatic pressure is also analyzed.Combining with concrete engineering practice in waste dump of Haerwusu Coal Mine,the analysis result is vertified.In this paper,the fluid-solid coupling effect and stability of dump under various hydrodynamic pressures are analyzed,providing theoretical basis for the dump of gully bottom.