崩塌危岩体稳定性定量评价及防治对策

THE QUANTITATIVE EVALUATION AND COUNTERMEASURES OF THE STABILITY OF ROCKFALL

对迪那某桥梁旁的危岩体进行勘查,在分析其地质环境条件下查明了该处危岩体的发育分布特征、裂隙发育特征和其形成的主导因素和诱发因素,在现场勘查和室内试验取得的岩体物理力学参数的基础上对其在天然状态、暴雨状态和地震状态下以及不同位置后缘裂隙进行了数值模拟计算,定量地对该危岩体进行了稳定性评价。结果显示:在目前状态下距陡崖面35m范围内处于欠稳定状态,距陡崖面42m处为基本稳定状态,在暴雨工况及地震工况下,距陡崖面35m范围内处于不稳定-欠稳定状态,距陡崖面42.0m处为基本稳定-不稳定状态。并根据研究结果对该危岩体提出了预应力锚索加固和削坡加载、加桩抗滑的防治对策。

An investigation which found out the development and distribution characteris-tics,the characteristics of fracture development and the leading factors and inducing factors of the dangerous rock mass based on the analysis of geological conditions was conducted on dangerous rock body near the bridge in Dina.Based on the physical and mechanical parame-ters of rock mass obtained in the field investigation and laboratory test,an numerical simula-tion was completed under natural conditions,storm conditions and earthquake status,frac-ture of posterior border in different positions,and we evaluate the stability of the dangerous rock mass.The results show that：the dangerous rock mass is nearly stable state in the range of 35 m under current state,and basically stable state in the range of 42 m;the dan-gerous rock mass is unstable-nearly stable state in the range of 35 m under current state un-der storm conditions and earthquake state,and basically-unstable stable state in the range of 42m.According to the results of the study,the prevention and control measures of pres-tressed anchor reinforcement,cutting load and adding pile anti slide were put forward.