Forming Mechanism of the Loess Landslides in Xiji of Ningxia with Low-Angle,High Speed and Far-Distance

袁丽侠

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Forming Mechanism of the Loess Landslides in Xiji of Ningxia with Low-Angle,High Speed and Far-Distance

更新时间：2025-12-11

- Forming Mechanism of the Loess Landslides in Xiji of Ningxia with Low-Angle,High Speed and Far-Distance
- Issue 2, Pages: 219-223(2006)
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  CLC： 642.22
- Published：2006
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[1]袁丽侠.宁夏西吉县低角高速远程黄土滑坡及其形成机理分析[J].防灾减灾工程学报,2006(02):219-223.

袁丽侠. Forming Mechanism of the Loess Landslides in Xiji of Ningxia with Low-Angle,High Speed and Far-Distance[J]. 2006, (2): 219-223.
[1]袁丽侠.宁夏西吉县低角高速远程黄土滑坡及其形成机理分析[J].防灾减灾工程学报,2006(02):219-223. DOI：

袁丽侠. Forming Mechanism of the Loess Landslides in Xiji of Ningxia with Low-Angle,High Speed and Far-Distance[J]. 2006, (2): 219-223. DOI：

摘要

地震诱发黄土滑坡是1920年宁夏海原8.5级大地震在宁夏西吉县西南部的最严重地震次生灾害

该区域内滑坡规模大、密度高、类型全

主要类型是低角度、高速、远程黄土滑坡。经对典型滑坡进行野外地面调查、黄土层位划分、黄土显微结构测试和对滥泥河左右两岸的滑坡形态进行综合分析后认为:西吉地处中国黄土高原干旱地带

黄土堆积以大孔隙发育的非饱和黄土为主

地震时突发水异常使地下水位瞬间上升、黄土中孔隙水压增高、黄土自重加大

在地震力和水动力的共同作用下

导致黄土发生液化

这是该区地震诱发黄土滑坡的综合形成机理。

Abstract

The loess landslides are serious earthquake-induced secondary disasters

which are caused by a strong earthquake with magnitude 8.5 on the Richter scale in Haiyuan 1920.In this area

the loess landslides have special character not only in kind

but also in scale and density.After investigating in field of landslides

researching loess′s micro structure

dividing the loess layer and researching the shape of landslides located in lanni river

the mechanism of loess landslides is summarized in this article as follow.The local unsaturated loess had abundant hole and before the earthquake the ground water rose suddenly

which made hole water pressure increase and loess dead weight rose.Both the earthquake and the waterpower had effect on the loess liquefaction which caused loess landslides finally.All of above are forming mechanism of loess landslides in Xiji Ningxia.

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references

典型高速黄土滑坡群的系统工程地质研究[M]. 四川科学技术出版社 , 王家鼎,张倬元著, 1999

海原活动断裂带[M]. 地震出版社 , 国家地震局地质研究所,宁夏回族自治区地震局编著, 1990

宁夏回族自治区地震历史资料汇编[M]. 地震出版社 , 宁夏回族自治区地震局编, 1988

一九二○年海原大地震[M]. 地震出版社 , 国家地震局兰州地震研究所, 1980

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