地震荷载作用下抗滑桩加固边坡动力稳定性分析

发布时间：2018-10-04 22:37

【摘要】：边坡工程是与人类生活安危戚戚相关的重要工程,每年因边坡失稳而引发的灾害给人类带来了巨大的损失,因此边坡稳定性研究成为了岩土工程领域研究的重要课题。地震是导致边坡发生失稳的一个重要因素。抗滑桩作为一种有效加固措施已大量运用于边坡工程,然而抗滑桩对边坡抗震加固效果的研究才刚开始起步,有必要开展深入研究。本文通过一个概化土质边坡模型探讨抗滑桩加固参数对边坡动力响应及稳定性的影响,运用FLAC3D对加固前后的边坡在多种地震工况下响应进行数值模拟研究,为理论研究和工程实践提供参考。本文主要开展了如下研究工作:通过对不同幅值、不同时刻、不同频率的地震工况下边坡动力响应的对比分析,从位移、应变、加速度及速度四个方面探讨三个重要的地震动参数——幅值、持时、频率对边坡动力响应的影响,并对各地震工况下边坡的动力响应规律进行总结。研究了在不同地震工况下抗滑桩支护边坡桩参数(桩长、桩位、桩间距)对边坡动力响应的影响,通过不同抗滑桩支护方式加固后与未加固前边坡的对比,从位移、应变、加速度及速度四个方面说明了不同抗滑桩加固方式对加固效果的影响。叙述了强度折减法基本原理,重点对边坡失稳的判定方式进行了探讨,并提出本文对边坡失稳状态的判断流程。运用基于毕肖普(Bishop)的拟静力法对强度折减法及失稳判定方法计算的动力稳定系数进行了验证,并运用该方法得出了不同桩长及桩位抗滑桩加固方式的边坡动力稳定系数,与未加固的边坡进行对比,根据动力稳定系数评价地震工况下抗滑桩加固效果。
[Abstract]:Slope engineering is an important project related to the safety and security of human beings. The disasters caused by slope instability bring huge losses to human each year, so slope stability research has become an important subject in the field of geotechnical engineering. Earthquake is an important factor causing slope instability. Anti-slide pile, as an effective reinforcement measure, has been widely used in slope engineering. However, the research of anti-slide pile on the effect of anti-slide pile on slope seismic reinforcement has just begun, so it is necessary to carry out in-depth research. In this paper, a generalized soil slope model is used to study the influence of reinforcement parameters of anti-slide pile on the dynamic response and stability of the slope. FLAC3D is used to simulate the slope response under various seismic conditions. It provides reference for theoretical research and engineering practice. The main work of this paper is as follows: through the comparative analysis of slope dynamic response under different amplitude, different time, different frequency of earthquake, from the displacement, strain, The effects of three important ground motion parameters, amplitude and frequency on slope dynamic response are discussed in four aspects of acceleration and velocity, and the dynamic response law of slope under various earthquake conditions is summarized. The influence of pile parameters (pile length, pile position, pile spacing) on the dynamic response of slope supported by anti-slide pile under different seismic conditions is studied. Acceleration and speed show the influence of different anti-slide pile reinforcement methods on the reinforcement effect. This paper describes the basic principle of the strength reduction method, discusses the judging method of slope instability, and puts forward the judging flow of slope instability state in this paper. The dynamic stability coefficient calculated by strength reduction method and instability determination method is verified by pseudostatic method based on Bishop (Bishop), and the slope dynamic stability coefficient of different pile length and pile position anti-slide pile reinforcement method is obtained by using this method. Compared with the unreinforced slope, the reinforcement effect of anti-slide pile under seismic condition was evaluated according to the dynamic stability factor.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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