岩质高陡边坡动力响应及失稳机制大型振动台模型试验研究

针对岩质高陡边坡动力响应和失稳机制问题,设计并完成了含不连续节理的岩质高陡边坡大型振动台模型试验.对主要岩性特征,采用水泥、沙、铁粉、黏土与混合剂配制岩体材料.对岩质边坡的不连续节理,在边坡内部按照一定的规律设置表面摩擦系数极低的特氟龙布.试验表明,含顺向不连续面的高陡岩质边坡地震作用下的破坏形态主要有三个阶段:裂缝开展,坡面剥落,崩塌滑动;主要滑动面沿特氟龙开展,发生在2/3坡高的位置;加速度响应沿坡面向上有明显放大,水平向加速度占主导;当地震烈度加大时,离坡尖越近,加速度放大效应越强.

Shaking Table Test on Earthquake Response of Discontinuous Medium High and Steep Rock Slope

Abstract： Seismic response of rock slope with discontinuous is mainly affected by its geometrical and mechanical properties. Due to its reverse or bedding joints, high and steep rock slope is at high risk of collapse and damage. To solve this problem, the dynamic response and failure mechanism were studied using a large scale shaking table test. The rock material was prepared with cement, sand, iron powder, clay and mixture. The discontinuous joint was imitated using Teflon fabric with low skin-friction coefficient. The experimental results indicate that there are three steps during the failure, that is, development of cracks, spalling of the slope, collapse and sliding. The main slide surface appears at the height of 2/3 of the slope, along the Teflon fabric. The internal acceleration of the slope shows an obvious amplification effect along the slope surface, and horizontal acceleration is more effective. Besides, as the earthquake intensity increase, the acceleration amplification increases near the tip of the slope.