西南地区深切河谷形态及边坡应力场研究OA

To investigate the control mechanism of slope gradient,elevation and denudation history on the formation and evolution of the slope stress field in the deeply incised valley areas of Western China,and to provide a reference for the site selection of underground cav-erns in the high-stress regions of Western China,this paper analyzed the slope gradients and elevations of 12 deeply incised valleys in Western China based on statistical investigation and FLAC3D numerical simulation,which were generalized into three typical models:nearly V-shaped,nearly Y-shaped and nearly U-shaped.Furthermore,the distribution of the valley slope stress field was analyzed by simulating the valley denudation process.First,three-dimensional numerical calculation models for the three typical valley morphologies were established,and the typical numerical models were constructed based on the measured valley morphologies.Different denudation processes of the valleys were simulated to analyze the evolutionary characteristics of the slope stress field.The results show that with the deepening of denudation,the three principal stresses increase linearly with depth.After the completion of denudation,the nearly V-shaped valley has the smallest unloading range and better stability than the nearly Y-shaped and nearly U-shaped valleys.The site selec-tion of underground caverns should comprehensively consider valley morphology,slope gradient,elevation and denudation history,and the nearly V-shaped valley should be prioritized as the layout area.The research results can provide a certain reference for the site selection of underground caverns in the high-stress regions of Western China.