INSTABILITY MODEL OF VERTICAL LAYER ROCK SLOPE BASED ON THE STATISTICAL CONSTITUTIVE DAMAGE MODEL
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摘要:
根据直立层状岩石边坡的实际失稳模式，基于欧拉压杆失稳模型建立了直立层状岩石边坡在自重荷载作用下的失稳计算模型及临界高度计算方法。同时基于岩石内部含有初始损伤的客观事实，建立了基于统计损伤模型的直立层状岩石边坡失稳模型，并对两种不同模型的计算结果进行了讨论。研究结果表明，根据自重荷载作用下的失稳计算模型计算得到的直立岩质边坡溃屈失稳破坏临界高度约为其他研究者相应计算结果的75%，更符合边坡的实际受力特征及破坏情况。基于岩石统计损伤本构模型提出的直立层状岩石边坡失稳模型不但考虑了岩石的弹性模量等参数，而且结合了应力-应变曲线等特征，得出的结果也更符合实际。研究还发现计算参数m、ε0的变化对计算结果有较大影响，说明在类似问题中考虑岩石的损伤演化特性十分必要。
Abstract:According to the actual instability mode of the vertical layer rock slope, the instability calculation model and critical height calculation method under self-gravity load for the vertical layer rock slope on the basis of the Euler pressure bar instability failure method are established. Meanwhile, based on the fact that rock has initial damage, the instability model of the vertical layer rock slope based on the statistical damage model is set up, and the calculation results based on the two models above are discussed. The study result shows that the critical height of the vertical layer rock slope calculated by the method proposed in this paper is about 75% that of other researchers, which is more suitable for the actual loading characteristic and failure condition. The instability model of the vertical layer rock slope based on the rock statistical damage constitutive model not only considers the rock mechanical parameters such as elastic modulus, but also combines the characteristic of the stress-strain curve, from which the calculation result is more suitable for the actual condition. It is also found that the change of the calculation parameters m andε0 has much effect on the calculation results, which indicates that it is very necessary to consider rock damage evolution in the similar problem.
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