地震条件岩体结构面抗剪强度参数等效弱化研究

来源 :第四届全国水工岩石力学学术会议 | 被引量 : 0次 | 上传用户:gengboy
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  岩质边坡稳定一般受结构面控制,在地震作用下其稳定性会下降,如何有效的评价地震边坡的稳定性非常重要。对于受结构面控制的边坡在地震作用下的稳定问题,基于极限平衡原理和受力分析,把地震造成边坡稳定的劣化等效考虑为结构面抗剪强度参数的弱化。针对二维滑动块体和三维楔形体问题,提出了地震荷载作用下结构面抗剪强度参数等效弱化的计算方法。计算结果表明:结构面抗剪强度参数的降低程度主要取决于地震加速度的大小,与边坡体型、结构面形式等关系不大;参数等效弱化方法计算得到边坡的安全系数与常规地震力荷载方法基本一致。最后给出了结构面抗剪强度参数弱化比例和地震加速度之间的非线性关系式,可用于地震条件下结构面抗剪强度参数等效弱化的快速估算。
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