基于马迹山边坡开挖工程的稳定性研究

发布时间：2018-11-04 13:30

【摘要】：开挖和降雨是在工程建设中对边坡稳定影响较大的因素,其作用机理十分复杂,与工程地质条件、施工过程等多种因素有关。本文以舟山市马迹山码头D16边坡工点作为研究对象,利用工程地质勘查和物理力学实验等结果以及类似工程条件下的水-土特征曲线建立了降雨入渗模型。首先,利用Geo-slope软件分析了不同降雨条件下的孔隙水压力、位移、应变等分布特征,分析降雨对边坡稳定影响研究;其次,对开挖过程进行了模拟,研究了开挖对边坡的影响;最后,模拟了在降雨条件下开挖对降雨下边坡的变形以及稳定性的影响。主要工作如下:(1)利用Geo-slope软件分析0.005m/hr、0.01m/hr、0.02m/hr、0.025m/hr的降雨条件下持续48小时工况下的边坡内孔隙水压力、位移、应变等分布特征,分析降雨对边坡稳定影响研究。研究表明开挖前边坡在强降雨条件下会发生滑动,对边坡稳定不利。(2)建立了概化的马迹山岩质边坡工程地质剖面,利用软件分析了开挖对边坡的影响,主要根据位移、剪应力、剪应变、稳定性系数等因素分析了开挖对坡体的影响;同时,运用概率密度分析方法计算了开挖过程中边坡失效概率与可靠性系数。分析表明该开挖工程对边坡影响很小。(3)以降雨强度0.025m/hr持续48小时为计算工况,分析了开挖后边坡稳定性变化、孔隙水压力、含水量、位移、应变等特征,分析表明:降雨对开挖前边坡稳定性影响,且易于引起滑坡;而降雨对开挖后的边坡稳定性影响很小。
[Abstract]:Excavation and rainfall are the factors that have great influence on slope stability in engineering construction. The mechanism of excavation and rainfall is very complex, which is related to engineering geological conditions, construction process and other factors. In this paper, the D16 slope site of Majishan Wharf in Zhoushan City is taken as the research object, and the rainfall infiltration model is established by using the results of engineering geological survey and physical and mechanical experiments, as well as the characteristic curves of water-soil under similar engineering conditions. Firstly, the distribution characteristics of pore water pressure, displacement and strain under different rainfall conditions are analyzed by Geo-slope software, and the influence of rainfall on slope stability is analyzed. Secondly, the excavation process is simulated and the influence of excavation on slope is studied. Finally, the influence of excavation on slope deformation and stability under rainfall is simulated. The main work is as follows: (1) the distribution characteristics of pore water pressure, displacement, strain and so on in the slope under the condition of rainfall of 0.005 m / h, 0.01m / h, 0.02m / h, 0.025m / hr, lasting for 48 hours, are analyzed by using Geo-slope software. The influence of rainfall on slope stability is analyzed. The research shows that the slope will slide under the condition of heavy rainfall before excavation, which is unfavorable to the stability of the slope. (2) the engineering geological profile of the Matrace rock slope is established, and the influence of the excavation on the slope is analyzed by software, mainly according to the displacement. Factors such as shear stress, shear strain and stability coefficient are analyzed to analyze the influence of excavation on slope body. At the same time, the probability density analysis method is used to calculate the slope failure probability and reliability coefficient. The analysis shows that the excavation works have little influence on the slope. (3) the slope stability change, pore water pressure, water content, displacement, strain and so on after excavation are analyzed with rainfall intensity 0.025m/hr for 48 hours. The analysis shows that rainfall affects the stability of slope before excavation, and it is easy to cause landslide. Rainfall has little effect on slope stability after excavation.
【学位授予单位】：浙江海洋大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U656.1

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