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

ZHU Ji-liang; HUANG Run-qiu

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

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- Study on stability of talus slope in front of a dam in a huge hydroelectric station by using 3D numerical simulation
- Vol. 26, Issue 8, (2005)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TV74
- Online First：26 December 2013，
  
  Published：2005
- 稿件说明：
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ZHU Ji-liang, HUANG Run-qiu. Study on stability of talus slope in front of a dam in a huge hydroelectric station by using 3D numerical simulation[J]. 2005, 26(8).
DOI：

ZHU Ji-liang, HUANG Run-qiu. Study on stability of talus slope in front of a dam in a huge hydroelectric station by using 3D numerical simulation[J]. 2005, 26(8). DOI：

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，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1 472~1 610 m高程之间的堆积体有可能发生局部的中浅层破坏。

Abstract

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 1 360－1 450 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 ⑴Stress field of the talus slope is main weight field

its stresses distributes is mainly controlled by lithology; ⑵ Latent sliding surface is the interface of talus and the bedrock and above it in some height. ⑶ The displacement is toward to limit surface; and the displacement of the middle-front part of the talus slope is large; ⑷ The front zone’s close up improves stress state and raises the stability of talus slope; ⑸ It is wholly stable

but it maybe occurs middle-superficial layer failure between the elevations of 1 472－1 610 m .

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