【作者】 魏雪斐；

【导师】 涂兴怀；

【作者基本信息】 西华大学 ， 水利水电工程， 2010， 硕士

【摘要】 边坡稳定性问题涉及矿山工程、道桥工程、水利工程、建筑工程等诸多工程领域。边坡的稳定性受诸多因素的复合作用,各因素对边坡稳定性的影响程度决定了边坡工程的复杂性、不确定性和模糊性,能否正确评价其稳定性是确保工程安全和降低建设费用的关键环节。近年来,随着我国基础建设的大力发展,边坡稳定性的研究及其维护显得越来越重要。高边坡特别是岩质高边坡的稳定性分析与研究也越来越受到重视。其中预应力锚索加固技术在提高边坡稳定性中发挥着重要的作用,它能充分发挥岩体的自承能力,调节和提高岩土的自身强度和自稳能力,减轻支护结构的自重,节约工程材料,保证施工期的安全与稳定,具有显著的经济和社会效益。本文以典型的大渡河泸定水电站3#泄洪洞进、出口边坡为例,首先,采用岩质边坡分析软件EMU计算在无支护开挖和采用预应力锚索加固后边坡的稳定安全系数,分析计算所得稳定安全系数的变化规律,评价边坡的稳定性。为了更好的分析预应力锚索的加固机理,采用加锚节理岩体有限单元法中的等效力学模型和离散力学模型,分别对无支护条件及有支护条件下3#泄洪洞进、出口边坡的施工开挖进行有限元模拟计算,分析施工开挖过程中边坡位移和应力分布规律。最后,将数值模拟计算的位移与实测位移进行对比分析发现:数值模拟计算的位移与实测位移较吻合。从而可以进一步地验证两种模型的准确性与合理性,为工程设计和施工方案提供一定的参考。更多还原

【Abstract】 The stability of the slope in engineering circle is a much concerned question. The stability of a slope contains a lot of factors; and each of them plays an important role in the analysis. The correct result will be a fundamental factor and will offer useful suggestions to the engineering safety and the reducing of construction cost.Pre-stressed anchor cable technology can enhance the bearing capacity of the rock mass, thus the intensity and stability of the rock are reinforced as well. Therefore the pre-stressed anchor cable is widely used in slope engineering, and it will bring remarkable economic and social benefits.Two typical slopes are brought into this article as examples to calculate their stable parameters with EMU (Energy Method Upper Bound Limit Analysis): No.3 flood outlet and inlet slope in Daduhe Luding hydroelectric power station. Through checking the coincide degree with the actual measured data, the calculated data are compared with the measured results. In order to deal with this problem, two finite element models are introduced into this article to analyze the two slopes in this situation. One is called equivalent model and the other one is called separated model. And then outcomes are verified with the practical data to find which model is more rational and accurate. The conclusion may be a great reference to designers and workers.更多还原