某金沙江大桥顺层岩质岸坡稳定性分析

顺层岩质边坡的稳定性常常影响到山区高速公路建设的顺利开展。通过对金沙江某拟建大桥的工程地质和岩体结构分析，采用基于地质强度指标（GSI）的等效Mohr-Coulomb强度参数法确定了桥基岩体力学参数，并用极限平衡法分析了四川侧岸坡拉裂-滑移破坏模式的稳定性。计算结果表明:四川侧岸坡在天然工况和暴雨工况下是稳定的，但在暴雨+地震工况下处于欠稳定状态，需要采取支挡措施。

Stability Analysis of Bedding Rock Bank Slope along a Large Bridge on Jinsha River

The stability of bedding rock slope always impacts the construction of mountainous highway. Herein the engineering geology and rock structure of a bridge intended to be built on Jinsha River were analyzed, thus the mechanical parameters of the bridge foundation rock were determined by the equivalent Mohr-Coulomb strength parameter method based on geological strength index (GSI); then the stability of cracking-sliding failure mode of the bank slope in Sichuan was analyzed by limit equilibrium method. The result shows that the bank slope in Sichuan is stable in natural and rainstorm conditions, but is understable in rainstorm plus earthquake conditions and needs retaining measures at that time.