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岩质边坡的地震响应是当前岩土工程界所关注的重要问题之一。以紫坪铺工程进水口边坡为研究对象,以现场监测数据为基础,从时间和空间的角度综合分析了汶川地震前、后支护荷载和边坡位移的变化特征,并讨论了坡体形态、岩体结构以及支护荷载对地震力作用的协同影响。研究结果表明:受地震力作用影响,坡体变形和支护荷载发生突变,主要受主震影响;地震引起的支护荷载变化量在100 k N以内,未超出设计荷载的5%;边坡水平向产生的永久位移在12 mm范围内,岩体变形深度受结构面分布控制;边坡中部变形最大,沿水平方向具有明显的临空面放大效应,而沿高程方向,没有明显垂直放大效应。研究成果可加深对锚固岩体动力响应机制的认识,同时为以位移控制的边坡工程抗震设计提供参考。
Seismic response of rock slope is one of the most important issues concerned by geotechnical engineering. Based on the on-site monitoring data, the change characteristics of support load and slope displacement before and after Wenchuan earthquake are analyzed from the perspective of on-site monitoring data. The slope characteristics of slope Shape, rock mass structure and supporting load on the synergistic effect of seismic forces. The results show that the deformation and supporting load of the slope change suddenly and are mainly affected by the main shock due to the earthquake force. The variation of the supporting load caused by the earthquake is less than 100% of the designed load and the slope does not exceed 5% The permanent displacement produced by the horizontal direction is within 12 mm, and the deformation depth of rock mass is controlled by the distribution of structural plane. The deformation of the middle slope is the largest, with obvious enlargement effect of the freeboard surface along the horizontal direction, and no obvious vertical enlargement effect along the elevation direction . The research results can deepen the understanding of the dynamic response mechanism of anchored rock mass and provide a reference for the seismic design of slope engineering with displacement control.