千将坪滑坡变形特征及其机理研究

通过三维有限元方法研究千将坪滑坡.建立滑坡三维有限元计算模型,模拟库水位上升和降雨过程引起的千将坪滑坡变形破坏机理.对千将坪滑坡在不同工况下的计算结果进行比较分析,得出在库水位上升和降雨条件下的滑坡位移场和塑性区的变化规律,从而揭示千将坪滑坡的整体变形破坏机制.     

Assessment and Risk Zonation of Landslides in Panxi Area Based on 3S Technology

0IntroductionThe Panxi Area is situated at the Valley ofJialing River with rich products and hugedeveloping potentials,anditis ani mportant ecolo-gy barrier of maintaining the ecological environ-ment stable of Sichuan Province and even that ofthe whole China[1].At the same ti me,the PanxiAreais an ecology frail area,andits one of obvi-ous expressionsis the frequent occurrence of geo-logical disaster[2,3].According to the investigation[4],there are5148debris flows with drainage area above0.…     

Occurrence Conditions and Process Analysis on Fluidization of Valley Type Landslide： Example of the Fluidization of Landslide in Qiongshan Ravine, Danba

0IntroductionFluidization of landslideindicates the action andprocess of an alivelandslide motion of conver-ting fromsliding state to fluidal disposition due tovibration and watering function occurred in processof landslide’s mediumand high velocity movement.Research onfluidization of landslide is a major sub-ject inthe field of landslide and debris flowstudies,which has a significance of deepening people’s un-derstanding of landslide disaster and rules of debrisflow occurrence.For example,S…     

梧州长洲岛竹湾段3号滑坡勘测与治理

滑坡是危害防洪堤安全最常见的一种形式,因此确定堤基是否存在滑动和如何经济地治理滑坡是水利工程设计者最为关注的.基于3号滑坡的特点,运用三种测试手段准确地确定了滑动面,经过对形成滑坡的因素进行分析及稳定性评价,提出可供设计的滑坡整治方案,施工后的防洪堤段经受了百年一遇的洪水侵袭,已安全度汛,说明勘测、设计与治理都是成功的.     

Landslides and Slope Aspect in the Three Gorges Reservoir Area Based on GIS and Information Value Model

Slope aspect is one of the indispensable internal factors besides lithology, relative elevation and slope degree. In this paper authors use information value model with Geo graphical Information System （GIS） technology to study how slope aspect contributes to landslide growth from Yunyang to Wushan segment in the Three Gorges Reservoir area, and the relationship between aspect and landslide growth is quantified. Through the research on 205 landslides examples, it is found that the slope contributes most whose aspect is towards south,southeast and southwest aspect contribute moderately, and other five aspects contribute little. The research result inosculates preferably with the fact. The result of this paper can provide potent gist to the construction of Three Gorges Reservoir area in future.     

金沙江中游滑坡堵江事件及古滑坡体稳定性分析

金沙江中游某拟定水电站坝址区下游发育一段非基质结构岸坡,岸坡覆盖层厚度巨大,物质组分均由白云质灰岩构成,其结构密实,表部胶结良好,形成呈似角砾状堆积体结构特征。对这套堆积体物质结构特征进行了研究,确定为平推式滑坡的成因模式。该滑坡造成了金沙江中游一次大规模的堵江事件,采样进行¹⁴C测年分析,结果显示滑坡发生时代约为19,000a前。对该岸坡段调查分析表明,该古滑坡堆积体结构长期处于稳定状态,现今并无变形复活迹象,其整体不存在失稳条件。     

灌溉诱发高速黄土滑坡的运动机理

针对黄土高原灌溉诱发的高速黄土滑坡所出现的各种迹象, 本文建立了滑坡体的运动模型。利用变分原理推导出了滑坡体的滑动轨迹、滑速、滑距以及黄土泥流 (液化物质)的流速公式。用这些公式对刘家峡、盐锅峡及八盘峡库区黑方台高速黄土滑坡群发生的全过程进行了模拟计算, 其结果与实际情况-致。     

滑坡防治的应力重塑方法

对于开挖土方引起的滑坡问题 ,文章提出应力重塑方法对坡面进行初始应力状态的重塑及恢复 ,使得边坡土体回复到原本未开挖的稳定应力状态。应用此方法 ,并与膨胀锚相配合 ,进行滑坡治理 ,可以增加坡面土体的抗滑能力。采用膨胀锚作为阻止土体抗滑的结构措施 ,可使坡面滑坡标本兼治 ,并可大大降低治理滑坡的费用     

三峡工程库区淹锅沙坝滑坡体特征及稳定性分析

淹锅沙坝滑坡位于长江南岸,跨三峡工程坝51.30km,滑坡体上部为土夹碎块石松散堆积体,下部为基岩滑动形成的块裂体,经对滑坡体进行稳定性分析与计算表明,滑坡体目前状态是基本稳定的,在三峡水库蓄水后,滑坡体前部可能失稳,进而影响滑坡体后部的稳定性。     

基于GIS的地震滑坡危险性的模糊综合评价研究

地震滑坡的形成机制复杂,影响因素众多,但各个因素对滑坡稳定性的影响却不一样。以往的研究中,对影响因素权重的确定主观因素有很大的影响。在前人研究的基础上,利用层次分析法对地震滑坡各影响因素的权重进行确定,较好地克服了主观因素的影响,在此基础上利用模糊数学的方法对研究区域的地震滑坡危险性进行评定,编制了地震滑坡危险性评价图。