某堆积体开挖后的稳定性三维数值模拟研究  

Study on the Stability of a Talus Slope after Excavation by Using 3D Numerical Modeling

作　　者：朱继良[1] 张诗媛[2] 

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]四川大学生命科学学院,成都610065

出　　处：《水土保持研究》2005年第6期238-241,共4页Research of Soil and Water Conservation

摘　　要：野外现场工作发现,坝前堆积体边坡为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1 360～1 450 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,通过采用目前较为通用的三维有限元软件(3D-Flac),分别对其稳定性采用基座有位移和基座无位移等两种不同的方法进行数值模拟研究,结果表明:(1)堆积体的主应力分布主要受岩性控制,其前缘的收口效应改善了主应力状态,增加了它的稳定性;(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;(2)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)堆积体的整体稳定性较好,在1 387～1 610 m高程之间的堆积体有可能发生局部的中浅层破坏;(5)两种模拟分析方法有较强的对比性和吻合性.因基座无位移法比较直观,所以建议对分析堆积体的变形与破坏情况时,采用后者.A conclusion is drawn on site that it is a incised gully collapsing talus slope consisting of bedrock and unconsolidated deposit. There are evidence close up and turnaround between 1 360-1 450 m elevation which are contributed to its stability. The data that by using 3D numerical modeling （3D-Sigma and 3D-Flac） show that （1）Stress field of the talus slope is main weight field,its stress distribution is mainly controlled by lithology, its front zone＇s close up changes stresses state and improves the stability of talus slopes （2） Latent sliding surface is the interface of talus and the bedrock and above it in some heights （3） The displace is toward to limit surface,and the middle-front part of the talus slope is large; （4）It is wholly stable, but it maybe occurs middle-superficial layer failure between 1 387-1 610 m elevation;（5）The results have good correlation and concordance,because the latter one is visual ,in order to understand its deformation and failure,it is suggested to use it.

关 键 词：水电站 堆积体 三维数值模拟 稳定性 

分 类 号：TV689.11[水利工程—水利水电工程]