摘要
ⅡB ⅢJ变形体位于黄河拉西瓦水电站左坝肩下游。地质分析表明,变形体的形成是上游F29楔形滑体破坏过程牵动所致。地下水对这一楔形滑体的破坏及ⅡB ⅢJ变形体的形成起了重要的控制作用。通过相似材料地质力学模拟试验,短期内动态地再现了该变形体的形成过程。模拟所得变形破裂特征与变形体实际变形破裂特征具有很好的对应性,验证了对其破坏机制地质分析的客观认识。同时得出F29楔形体单纯在自重应力下不会产生整体失稳。失稳下滑之原因主要是因大量降雨、冰雪融水渗入F29断层及楔形体后缘陡倾裂面,并产生异常空隙水压力所致。ⅡB ⅢJ变形体是在楔形体失稳下滑的牵引作用下,产生旋转拉裂松动变形所致。同时也证明变形体在自然状态下已处于稳定状态。提出在不利条件下对该变形体的处理措施。
ⅡBⅢJ deformationfracture situates in the left bank of the Laxiwa Hydroelectric Station on the Huanghe River. The geological analysis indicates that the sliding movement of the Fracture 29th is the forming cause of the deformationfracture. The ground water play an important role in the course of gliding mass formed and damaged. Depending on the geologymechanic modeling test, we can reappear the integral damage process. The deformationfracture damaged feature in modeling test is similar to the practical deformation. This truth tests and verifies the objective cognition of this damage mechanism. At the same time, we can conclude that the Fracture 29th will not lose its integral stability just under the gravity. The major cause of the wedge destabilization resulted from water come from rainfall and snowfall infiltrated into the Fracture 29th and theafteredge of the abnormal interstitial hydraulic pressure. Besides this, we can testify that the deformationfracture is stable under the nature station and we put forward the measure to curb the formation of this deformationfracture under the disadvantage condition.
出处
《中国地质灾害与防治学报》
CSCD
2003年第4期86-89,共4页
The Chinese Journal of Geological Hazard and Control
基金
中国博士后基金(2001)资助项目
关键词
变形破裂体
旋转滑移
变形破裂机制
地质力学模拟
拉西瓦水电站
deformation-fracture
rotation-sliding
mechanism of deformation and cracking
Geomechanical modeling
Laxiwa Hydroelectric Station
