大岗山水电站边坡抗剪岩-洞相互作用研究

大岗山水电站右岸边坡地质条件复杂,地应力较高,发育有辉绿岩脉、中倾坡外的断层、卸荷裂隙密集带等不利组合体,边坡稳定性问题极为突出。将实际微震监测技术与有限差分数值软件FLAC~(3D)结合,对抗剪洞加固前、后的边坡稳定性以及岩-洞两体的相互作用进行分析。指出边坡开挖过程中岩体空间损伤劣化的微震活动规律和可能发生坡体失稳的潜在滑动面位置。研究发现抗剪洞起到了很好的加固作用,加固后潜在滑体产生的位移几乎不到加固前的一半、坡体的安全系数提高了36.2%及微震监测得到的微震事件降低了约66.4%。

Rock-gallery Anti-shear Interaction of Dagangshan Hydropower Station Slope

The geological conditions of the right bank slope of Dagangshan hydropower station is complex with high in-situ stress.The geological defects in this slope include diabase dikes,faults moderately dipping outside slope,dense belts of unloading fissures,which make the stability problem of the slope serious.The stability of the slope before and after reinforcement and the interaction of rock-gallery were analyzed by the microseismic monitoring technology in combination of numerical simulations,i.e.the finite difference software FLAC3D.The potential sliding surface of slope failure was determined by microseismic events of rock mass spatial damages during slope excavation.The results show that the anti-shear gallery reinforces the slope markedly.The displacement after reinforcement of the slope is less than half of the slope before reinforcement.Safety factor of slope increases 36.2％ and the microseismic events reduced by 66.4％.