碾压砼重力坝深层抗滑稳定问题探讨

Discussion on Deep Anti-slip Stability of Roller Compacted Concrete Gravity Dam

在概述碾压砼重力坝沿坝基深层缓倾角软弱结构面抗滑稳定设计重要性的基础上,以新疆北疆地区某水利枢纽为例,进行抗力角和抗力体底滑面取值对抗滑稳定安全系数影响的分析。结果表明,抗力角取值的合理性以及抗力体底滑面的确定对于坝体深层抗滑稳定分析结果的可靠性十分关键;抗力角取值上限应不超出坝址基岩竖直面主应力向和水平面夹角以及根据最小抗力原则所确定的抗力体底滑面和水平面夹角;最后通过等安全系数法进行该碾压砼重力坝表孔坝段深层抗滑稳定的量化分析。

This paper summarizes the importance of anti-sliding and stable design of RCC gravity dam along the dam foundation's deep gently dip angle weak structural plane.On this basis,taking a water conservancy project in the northern Xinjiang region as an example,the influence of the resistance angle and the bottom sliding surface of the resistance body on the anti-sliding stability safety factor is analyzed.The results show that the rationality of the value of the resistance angle and the determination of the bottom sliding surface of the resistance body are very important to the reliability of the analysis results of the deep anti-sliding stability of the dam body;The upper limit of the resistance angle shall not exceed the angle between the principal stress direction and the horizontal plane of the vertical plane of the bedrock of the dam site and the angle between the bottom sliding surface and the horizontal plane of the resistance body determined according to the principle of minimum resistance;Finally,a quantitative analysis of the anti-slip stability of the surface hole and dam section of the roller compacted concrete gravity dam is carried out by the method of equal safety factor.