节理岩体边坡关键块体的失稳概率研究

The Failure Likelihood of Key Block of Jointed Rock Slope

岩体边坡的破坏一般是由于关键块体的失稳产生的连锁反应而导致的整体失效,因此关键块体是影响边坡稳定性的核心因素。采用块体的失稳概率对关键块体的稳定性进行了评价,失稳概率与2个参数有关:节理交切概率和裂隙锥的不稳定参数,并利用岩体结构面的连通率对节理交切概率进行了修正,修正后的节理交切概率更能反映结构面的尺寸和不连续性。结果表明,用失稳概率评价关键块体的破坏可能性,可以为岩体边坡的支护设计提供依据。

The failure of slope is generally caused by the destabilization of key block which lead to the conducive chain reaction of failure.So the key block is the core factor affecting the stability of slope.The block failure probability,which was related to two parameters： the joint intersection probability and the JP instability parameter to evaluate the stability of the key block.And then,the connectivity rate of rock structural surface was adopted to revise the joint intersection probability.The revised joint intersection probability could reflect the size and discontinuity of structural planes.The result shows that the failure probability of the key block could be evaluated with the block failure likelihood which can provide the basis for the design of rock slope support.