某大型水电站水文站滑坡蓄水后的稳定性三维数值模拟研究

STUDY ON THE STABILITY OF SHUIWENZHAN SLOPE IN A LARGE HYDROSTATION AFTER IMPOUNDMENT BY USING 3D NUMERICAL MODELING

水文站滑坡蓄水后的稳定性状况,直接关系到大坝的运营与安全,一直是各部门都十分关心的重要问题。通过三维有限元(FLAC3D)对其蓄水后滑坡体的稳定性状况进行数值模拟分析,结果表明:在蓄水初期,滑坡体的变形量小,滑坡体的整体稳定性较好。随着蓄水位的增加,其变形量也逐渐呈增大的趋势。当蓄水位达到1850m高程时,滑坡体就开始发生了局部的较大变形或破坏。当达到正常蓄水位(1880m高程)时,变形与破坏现象进一步加剧,范围也进一步有所扩大。但总的来说,水文站滑坡整体稳定性较好,属中浅层滑坡。

The stability of Shuiwenzhan slope after impoundment is very important to each correlative department because it affects the dam safety and its usage. The results by 3D numerical modeling indicate that there are three failure planes in the slope, a major failure plane and two secondary ones. The connectivity of the major one is low and the others are high. The results also indicate that its deformation is little and it is stable in general in the primary stage; With the impounded water level rising, its deformation increases. There is a large local deformation or damage while the impounded water level reaches 1850 m. The deformation and damage become bigger and wider leading to partial failure while the impounded water level is up to 1 880 m, but in a whole, it is still stable, and it could only slide in middle-superficial layer.