某水电站坝前堆积体稳定性的三维数值模拟分析  

Study on stability of talus slope in front of a dam in a huge hydroelectric station by using 3D numerical simulation

作　　者：朱继良[1] 黄润秋[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家专业实验室,成都610059

出　　处：《岩土力学》2005年第8期1318-1322,共5页Rock and Soil Mechanics

摘　　要：某水电站坝前堆积体边坡的稳定性关系到该大坝的建设与运营.野外工作发现,它是深切冲沟型崩塌式堆积体,由下伏基岩和松散的堆积物组成.在1360～1450 m高程之间堆积体有一个较为明显的收口转向特征,这有利于增加其稳定性.在野外工作的基础上,采用目前较为通用的两种三维有限元软件(3D-Sigma和3D-Flac)对其稳定性进行数值模拟研究.结果表明:(1)堆积体的应力场主要表现为以自重应力场为主,其应力分布主要受岩性控制;(2)堆积体的潜在滑动面为堆积体与其下伏基岩接触部位的一定范围内;(3)堆积体的位移表现为向坡外(临空面方向)滑移,且中前缘的位移量相对较大;(4)堆积体前缘的收口效应改善了其应力状态,增加了稳定性;(5)堆积体的整体稳定性较好,在1472～1610 m高程之间的堆积体有可能发生局部的中浅层破坏.The stability of the talus slope is important to its construction and operation. We draw a conclusion on site that it is a incised gully collapsing talus slope that are consisted of bedrock and unconsolidated deposit. There are evidence close up and turn around between the elevations of 1360-1450 m, the elevations of elevation which are contributed to its stability. The data that by using 3D numerical simulation (3D-Sigma and 3D-Flac) show that (1) Stress field of the talus slope is main weight field, its stresses distributes is mainly controlled by lithology; (2) Latent sliding surface is the interface of talus and the bedrock and above it in some height. (3) The displacement is toward to limit surface; and the displacement of the middle-front part of the talus slope is large; (4) The front zone's close up improves stress state and raises the stability of talus slope; (5) It is wholly stable, but it maybe occurs middle-superficial layer failure between the elevations of 1472-1610 m.

关 键 词：水电站 堆积体 三维数值模拟 稳定性 

分 类 号：TV74[水利工程—水利水电工程] TB115[理学—数学]