考虑应力水平的胶凝砂砾石坝安全分析

Safety analysis of cemented sand and gravel dam considering different stress levels

采用对称梯形剖面的胶凝砂砾石坝整体安全稳定性较高,但在不同结构破坏方法作用下,坝趾、坝基面部位较为脆弱。为具体分析胶凝砂砾石坝的安全特性,针对某100 m级胶凝砂砾石坝,以等高程重力坝作为参照,设计三种水位工况,计算分析不同荷载作用下两种坝型的应力情况,并引入应力水平、点安全系数法分析两种坝型的抗剪、抗滑稳定情况。分析结果表明胶凝砂砾石坝安全性优于等高程重力坝,主要表现为应力受水荷载影响较小,应力水平分布合理,同等地基条件下安全系数较高。

The overall security and stability of cemented sand and gravel dam are better by using thesymmetric trapezoidal profile, but the toe and the foundation of the dam are fragile. In order to analyzethe safety of cemented sand and gravel dam, the stress of a cemented sand and gravel dam with 100 m inheight and the comparison with gravity dam are analyzed under three water levels. And the anti-shearand anti-sliding stability analyses of these two dams are carried out by introducing the stress level andpoint safety factor method. The results show that the safety of cemented sand and gravel dam is betterthan the gravity dam with the same elevation, the stress is less affected by water load, the stress level dis-tribution is more reasonable and the safety factor is higher under the same foundation conditions.