【摘要】 通过试验建立了同时考虑危岩主控结构面贯通率和防治工程安全等级的危岩主控结构面抗剪强度参数贯通率法;按照出现频率,将作用在危岩体上的荷载拟定为三种荷载组合(工况)。认为处于特大型水利工程区或高频率强烈地震区的一级防治工程,应将设计荷载组合调整为"自重+裂隙水压力(暴雨状态)+地震力";基于极限平衡理论详细推导了滑塌式危岩、倾倒式危岩和坠落式危岩在不同荷载组合下的稳定系数计算方法,结合稳定性评价标准,系统建立了危岩稳定性分析方法。应用这种危岩主控结构面抗剪强度参数贯通率法确定的c、φ值比规范推荐的长度加权方法随机性要小,经2001~2007年现场观测验证计算结果是比较符合实际情况的。更多还原

【Abstract】 A method to identify anti-shear strength parameters,considering the joint ratio of the control fissure and the safety grade for control engineering simultaneously is established in accordance with a quantity of tests and observations.In views of appearance frequency of loads acting on perilous rock,three types of load composites are designated.For any top grade engineering sitting in giant hydraulic project or strong earthquake region,the design loads must be adjusted as weight & fissure pressure in rainstorm status & earthquake force.For the sliding perilous rock,the toppling perilous rock and the falling perilous rock,methods for calculating the factor of stability under various load composites are deduced in detail with the limit equilibrium theory,which are the reasonable stability analyses together with appraisal criteria for stability of perilous rock.Comparing with the randomicity of the values of c and φ,the value obtained by the linking ratio method for the anti-shear strength parameters of control fissure is smaller than the based on weighting methods suggested in the criterion.And the result is more consistent with the fact than the criterion site observation from 2001 to 2007.更多还原