锚固边坡楔体稳定性地质力学模型试验研究

GEOMECHANICAL MODEL TEST RESEARCH ON STABILITY OF REINFORCED WEDGE-SHAPED ROCK SLOPE

以李家峡水电站左岸岩质高边坡加固工程为背景,采用地质力学模型试验方法,完成了预应力锚索加固边坡模型和无锚索加固边坡模型的对比试验,研究边坡双滑面楔体稳定性和锚固效应的问题。给出了复杂岩体边坡和预应力锚索体的相似物理模拟方法,锚固和未锚固状态下边坡双滑面楔体的相对位移和绝对位移的变化形态、锚索预应力时程变化特征、锚索轴力变化特征以及边坡不同部位的锚索的受力破坏特点等结果。在此基础上,对上述两种状态下边坡楔体的安全稳定性进行了计算和对比分析,结果表明锚固边坡比无锚固边坡安全系数高1.4倍以上,并总结给出了预应力锚索对边坡双滑面楔体的加固效应。

On the background of reinforcement engineering of the left-bank of Lijiaxia Hydropower Station, two models, one of which is reinforced by prestressed cable and the other is not reinforced, are compared by geomechanical model experiment techniques. The stability and reinforcing effect on wedge-shaped rock with double sliding Surfaces in the slope are researched. The method of simulating complex rock slope and prestressed cable are given. Some results, the variety of relative displacement and absolute displacement of the wedge-shaped rock with double sliding surfaces of the two above models, the prestressed force variation rules of cable with time, the axial force variation rules of anchor cable with time, and the deformation and damage characteristics of cable in different areas of slope are presented. Based on the results, the safety factor of two models are calculated and analyzed. The calculated results show that the safety factor of reinforced slope is 1.4 times higher than that of not reinforced one. Finally, the reinforcement effect on the wedge-shaped rock with two sliding surfaces in the slope reinforced by prestressed cable is summarized.