高填方机场边坡稳定性影响因素分析

发布时间：2018-03-06 19:25

本文选题：高填方边坡　切入点：稳定性　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来随着国家经济实力的快速发展,国家加大了对基础工程的建设,越来越多的机场修建在山区。然而山区地形起伏变化大,机场建设就面临着很多问题,为了满足机场建设场区面积和净空的要求,很多在山区建设的机场就会形成高填方。高填方边坡稳定性是机场修建过程当中面临的一个重大安全性问题。而一个边坡发生失稳的原因并不是单一的,往往是多种因素耦合而成的。本文中主要研究西南地区机场填筑高边坡稳定性影响因素,整个西南地区岩土体具有相似性,因此本文以攀枝花机场和达州机场为例着重选取地震、降雨、地下水以及填筑高度因素来逐个分析对边坡稳定性影响特征,论文主要工作如下:(1)阐明了影响滑坡失稳的几个关键因素的作用方式及作用机理,并针对性的为滑坡治理提供了参考意见。(2)分别研究了攀枝花机场、达州机场在地震单因素影响下的稳定性变化规律,稳定性系数随地震水平加速度a的增加而递减,呈良好的负线性关系,并分析了产生这一现象的主要原因。(3)分别研究了攀枝花机场、达州机场在降雨单因素影响下的稳定性变化规律,当降雨量较小时,降雨量对稳定性系数影响不大,当降雨量达到某一极值时,稳定性系数陡降,并通过数值模拟软件Geo Studio/seep模块对这一现象进行了详细的分析。(4)根据攀枝花机场场地的具体情况,研究了滑坡后缘的地下水入渗对滑坡造成的影响,后缘渗水对该滑坡的稳定性造成了很大的影响,并通过数值模拟软件Geo Studio/seep模块对这一现象进行了详细的分析。(5)分别以攀枝花机场、达州机场为例研究了填筑高度、填料的内摩擦角、填料密度对高填方边坡的影响,并总结了其影响规律。(6)以正交试验为指导思想通过多因素综合分析得出,高填方边坡稳定性影响因素中的敏感程度较强的为:地震水平加速度,地下水渗流,降雨。
[Abstract]:In recent years, with the rapid development of national economic strength, the state has increased the construction of basic projects. More and more airports have been built in mountainous areas. In order to meet the requirements of the airport construction site area area and clearance, Many airports built in mountainous areas will form high fill. The stability of high fill slope is a major safety problem in the process of airport construction. The reason for the instability of a slope is not a single one. In this paper, the influence factors of the stability of the airport filling high slope in southwest China are studied, and the rock and soil in the whole southwest area are similar. Therefore, taking Panzhihua Airport and Dazhou Airport as examples, this paper focuses on selecting factors of earthquake, rainfall, groundwater and filling height to analyze the influence characteristics of slope stability one by one. The main work of this paper is as follows: (1) clarifying the action mode and mechanism of several key factors affecting landslide instability, and providing reference advice for landslide control. (2) studying Panzhihua Airport respectively. The stability variation law of Dazhou Airport under the influence of earthquake single factor, the stability coefficient decreases with the increase of horizontal acceleration a, and shows a good negative linear relationship. The main reasons for this phenomenon are analyzed.) the stability of Panzhihua Airport and Dazhou Airport under the influence of rainfall single factor is studied respectively. When rainfall is small, rainfall has little effect on stability coefficient. When the rainfall reaches a certain extreme, the stability coefficient drops steeply, and the phenomenon is analyzed in detail by the numerical simulation software Geo Studio/seep. 4) according to the concrete situation of Panzhihua Airport, The influence of groundwater infiltration on the landslide is studied, and the stability of the landslide is greatly affected by the seepage of the back edge. The numerical simulation software Geo Studio/seep module is used to analyze this phenomenon in detail. Taking Panzhihua Airport and Dazhou Airport as examples, the effects of filling height, filling internal friction angle and packing density on high fill slope are studied. Based on the orthogonal test, it is concluded that the sensitivity of the factors affecting the stability of high fill slope is: horizontal acceleration of earthquake, seepage of groundwater and rainfall.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43

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