山区高速公路顺层岩质边坡稳定性研究

发布时间：2018-12-15 03:43

【摘要】：工程实践表明:顺层岩质边坡是失稳最多、危害最大的一类边坡,给山区高速公路建设和运营造成了巨大的损失。本文依托国家科技支撑计划课题“西南山区干线公路路基灾变过程控制与动态调控技术(2015BAK09B01)”展开研究,以渝黔高速公路某段顺层岩质边坡滑塌为例,对顺层岩质边坡破坏机理、稳定性计算、工程处治设计等进行分析和研究,同时结合项目特点,在施工过程中进行实时监控,确保施工安全,并采用快速旋挖机械成桩施工方法,快速形成“抗滑桩+斜撑墙+锚索”联合防护,利用FLAC数值模拟加固方案,对加固效果进行稳定性评价。其主要研究主要成果如下:(1)归纳总结了顺层岩质边坡稳定性研究现状及处治技术,基于文献查阅及广泛调研总结了顺层岩质边坡失稳的两种形式:变形和破坏。(2)基于FLAC中的有限差分分析方法,采用摩尔-库伦(Morh-Coulomb Model)准则,建立了多个不同坡角、坡高、岩层倾角组合模型,分析对顺层边坡安全系数的影响。数值模拟结果表明:边坡的安全系数随着坡高的增加、坡率的增加呈单调递减状态,随着岩层的倾角的增加呈现出先增大后减小的趋势,模拟结果与极限平衡法得到的结果变化趋势基本吻合。(3)以渝黔高速某段顺层边坡滑塌事故为工程背景,根据其工程特点,采用了“云眼”可视化边坡智能监控系统对边坡全方位监控,根据稳定性计算和数值模拟分析边坡最大位移量,设置监测数据阀值,数据超过设定阈值时及时预警,实现了抢险决策过程的信息化,因地制宜地制定联合加固方案,达到处治目的。(4)应用FLAC数值分析软件,对西南地区渝黔高速公路某顺层岩质边坡进行模拟分析,通过对垮塌之后未防护、防护之后顺层边坡应力场、位移场进行对比分析,可以发现:顺层岩质边坡采用“抗滑桩+斜撑墙+锚索”联合加固后,提高了边坡的稳定性,使受力更趋合理,解决了锚杆(索)或抗滑桩单独使用所存在的弊端。
[Abstract]:The engineering practice shows that the bedding rock slope is the most unstable and harmful slope, which has caused huge losses to the construction and operation of highway in mountainous area. Based on the national science and technology support project "disaster process control and dynamic control technology (2015BAK09B01) of highway subgrade in southwest mountainous area", this paper takes the landslide of a rock slope in a section of Chongqing and Guizhou Expressway as an example. The failure mechanism, stability calculation and engineering treatment design of bedding rock slope are analyzed and studied. At the same time, combined with the characteristics of the project, real-time monitoring is carried out in the construction process to ensure the construction safety. By adopting the method of quick pile construction of rotary excavating machine, the combined protection of "anti-slide pile inclined braced wall anchor cable" was formed quickly, and the stability of the reinforcement effect was evaluated by using FLAC numerical simulation reinforcement scheme. The main research results are as follows: (1) the present research situation and treatment technology of bedding rock slope stability are summarized and summarized. Based on literature review and extensive investigation, two types of instability of bedding rock slope are summarized: deformation and failure. (2) based on the finite difference analysis method in FLAC, several different slope angles are established by using the Morh-Coulomb Model criterion. The influence of slope height and slope angle combination model on the safety factor of bedding slope is analyzed. The numerical simulation results show that the slope safety coefficient decreases monotonously with the increase of slope height, and increases first and then decreases with the increase of slope angle. The simulation results are in good agreement with the results obtained by the limit equilibrium method. (3) based on the engineering background of slope collapse accident in a section of high speed in Chongqing and Guizhou, according to its engineering characteristics, The "cloud eye" visual slope intelligent monitoring system is used to monitor the slope in all directions. According to the stability calculation and numerical simulation, the maximum displacement of the slope is analyzed, the monitoring data threshold is set, and the warning is timely when the data exceeds the set threshold. The information of emergency decision process is realized, and the joint reinforcement scheme is worked out according to local conditions. (4) the numerical analysis software of FLAC is used to simulate and analyze a bedding rock slope of Chongqing and Guizhou Expressway in Southwest China. Through the comparative analysis of the stress field and displacement field of the bedding slope after collapse and protection, it is found that the slope stability is improved by the combined reinforcement of "anti-slide pile inclined braced wall anchor cable". The force is more reasonable and the disadvantages of anchor rod (cable) or anti-slide pile are solved.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.14

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