库水升降作用下高陡岩质边坡稳定性分析  

Stability Analysis of High and Steep Rock Slope under the Action of Reservoir Water Fluctuation

作　　者：刘兴[1] 付厚利[1,2] 秦哲[3] 冯佰研 

机构地区：[1]山东科技大学土木工程与建筑学院,青岛266590 [2]临沂大学土木工程与建筑学院,临沂276000 [3]矿山灾害预防控制重点实验室-省部共建国家重点实验室培育基地(山东科技大学),青岛266590

出　　处：《科学技术与工程》2017年第24期263-268,共6页Science Technology and Engineering

摘　　要：为有效分析库水升降作用下库岸边坡稳定性,以三山岛金矿的仓上露天坑尾矿库高陡岩质边坡为例,选取库岸边坡岩样分别进行自然状态下和不同"饱水-失水"循环次数下的单轴抗拉强度试验、单轴抗压强度试验。考虑"饱水-失水"循环对岩石的损伤影响,在广义Hoek-Brown强度准则的基础上,引入了"饱水-失水"循环作用后岩石单轴抗压强度累积损伤率,对Hoek-Brown强度准则进行了改进,确定了库岸边坡的岩体力学参数。以此为基础,利用FLAC3D数值分析软件对库岸边坡进行稳定性分析研究。结果表明:库水升降作用对库岸边坡岩体物理力学性质的损伤作用十分明显,随库水升降循环次数的增多,库岸边坡岩体力学参数不断劣化。数值模拟监测情况与实际工程的位移监测数据对比分析整体误差较小,证明岩体力学参数计算的可靠性,以此为基础计算得库岸边坡将在经历30次"饱水-失水"循环作用后最终破坏失稳。其所得结论能够为类似边坡工程的稳定性分析提供参考与指导。In order to analyze the influence of reservoir water lifting to the stability of bank slope,the Open-pit high steep rock slope in the Sanshandao gold mine tailings warehouse was selected as an example,the uniaxial tensile and uniaxial compressive strength test on the bank slope rock under the two scenarios of natural conditions and different ＂water-saturation and water-loss＂cycles respectively were conducted. Additionally,considering the damage of the ＂water-saturation and water-loss＂cycles to the rock,the cumulative damage rate of uniaxial compressive strength of rock was integrated to improve the Hoek-Brown strength criterion,and further determined the mechanical parameters of rock mass of the bank slope. On this basis,the stability analysis of reservoir bank slope is carried out by using FLAC3 D numerical analysis software. The results showed that the reservoir water fluctuation had an obvious effect on the physical and mechanical properties of the rock mass. Further,the mechanical parameters of the rock mass will continuously deteriorate and decrease respectively,with the increase of the water cycle of the reservoir. The comparison between the numerical simulation and the displacement monitoring data shows that the overall error is small,and the reliability of the calculation of rock mass mechanical parameters is proved. On the basis of this,the bank slope will be destroyed after the 30 ＂water-saturation and water-loss ＂cycles. These conclusions aforementioned could provide reference and guidance for the stability analysis of similar slope engineering in practice.

关 键 词：库水升降 岩体力学参数 HOEK-BROWN准则 边坡稳定性 

分 类 号：TU457[建筑科学—岩土工程]