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清江隔河岩水利枢纽大坝采用下拱上重的型式,与岸坡相接的重力拱坝,重力坝段基础采用台阶式边坡,拱坝基础采用连续边坡,边坡最大高度达180余米。大坝基础主要为石龙洞灰岩,虽强度高,但岩层为软硬相间,且有断层、裂隙、夹层将岩体分割,破坏了它的整体性。边坡岩体失稳的主要形式是沿断层、裂隙及软弱结构面发生剪切位移,施工期间使用钻孔倾斜仪对两岸坝肩开挖边坡稳定性开展了监测工作,监测重点放在爆破振动、卸荷以及各种因素的综合作用下,断层、裂隙、软弱结构面及由它们切割组成的楔形体的稳定性。通过对监测成果的整理分析,说明施工过程中引起边坡岩体位移的主要原因是爆破振动与应力松驰。位移的主要部位是岩体软弱结构面。只要严格控制开挖过程中的爆破振动,且没有不利于稳定的软弱结构面,施工中采用1∶0.3的边坡基本上是稳定的。
The Qinghe Geheyan Water Control Dam adopts the type of heavy arch under the arch. The gravity arch dam connected with the bank slope and the gravity dam section foundation use the step-type slope. The arch dam foundation adopts the continuous slope with the maximum height of 180 I meters. Dam foundation is mainly Shilong cave limestone, although the intensity is high, but the rock is soft and hard, and have faults, cracks, dissection of the rock mass division, undermining its integrity. The main form of slope rock mass instability is shear displacement along faults, fissures and weak structural planes. During the construction, drilling slope inclinometer is used to monitor the stability of the excavation slope along the both banks. The monitoring is focused on blasting Vibration, unloading and the combination of various factors, the stability of faults, fissures, weak structural planes and wedges made by cutting them. Through the collation and analysis of the monitoring results, the main reason that caused the displacement of slope rock mass during construction is blasting vibration and stress relaxation. The main part of displacement is the weak structure of rock mass. As long as the blasting vibration during excavation is strictly controlled and there is no weak structural plane that is not conducive to stability, the slope with 1: 0.3 construction is basically stable during construction.