【作者】 李颢；

【导师】 姚环；

【作者基本信息】 福州大学 ， 环境工程， 2004， 硕士

【摘要】 边坡工程是岩土工程三大问题之一；路堑式土边坡是边坡工程中的重要类型之一；迅速发展的山区和丘陵地区的公路、铁路等交通工程建设，必然会遭遇路堑式坡残积土边坡的变形与稳定性问题。而这将是目前乃至今后相当长一段时间内需要解决的重要技术问题之一。因此，本文结合福建省交通厅科研课题《深挖路堑高填路堤的变形与稳定性的研究》以永—漳公路(永安段)K15+183工点残坡积土边坡工程实例为背景，采用非线性理论、现代监测技术和数值仿真模拟技术，从理论计算分析和现场监测分析与评价二大方面，全面系统综合地研究了路堑坡残积土质高边坡的稳定性和变形问题，主要的研究工作和工作成果概述如下：(1)通过了解边坡变形与稳定性研究的国内外动态和发展历程，进行了系统分类和总结，并从影响土质边坡变形与稳定性的因素入手，分析了路堑边坡的地质模式与破坏形式，为路堑边坡的变形与稳定性评价提供指导和依据；(2)通过工程地质建模和数学力学建模，拟订了较为完整的路堑坡残积土质边坡变形与稳定性评价思路，并运用极限平衡法(解析法与简化毕肖普法)与数值法(非线性有限元与Ansys)相结合的复合分析法对永漳公路永安段K15+183工点路堑坡残积土质边坡的变形与稳定性进行了计算分析评价；(3)通过现场位移跟踪监测，了解并掌握了该路堑高边坡随边坡开挖过程中内部位移情况。并分析了其坡体内部土体位移发展规律；(4)基于本文的研究和前人的成果，编制相应的计算程序，进行了计算、分析与比较。并通过K15+183工点路堑土质边坡的各类位移变形的监测成果验证了该程序的正确性及适用性；(5)通过应用大型有限元软件Ansys模拟分析，不仅分析了其随着开挖时间步的应力应变关系，并模拟了与实际测斜管相匹配的测斜路径，通过对各开挖时间步的模拟计算分析，得到了与实测数据较符合的结果；(6)综合监测分析成果和极限平衡理论计算分析成果，对K15+183工点路堑边坡的原设计坡率和几何形态进行了优化计算分析，取得了较为满意的结果。通过计算分析表明：1、该路堑边坡自然稳定性较高，其稳定安全系数为1.47~1.59。2、该路堑边坡开挖后侧向位移最大值为4.70cm(NLFEP)~5.38cm(Ansys)，与实测值3.5cm~5.5cm基本接近。同时边坡开挖后期坡顶会出现回弹现象。3、数值计算成果表明，随着开挖阶数的增加，大小主应力在边坡内也进行不断的调整。边坡开挖后坡脚处大小主应力值NLFEP程序结果与Ansys计算结果较为相似，两者吻合性较好。更多还原

【Abstract】 The slope project is one of the three big problems of geotechnical engineering; Cut soil slope is one of the important types of slope projects; Engineering construction of the traffic, such as highway, railway in the mountain area and hills area etc. is developing rapidly, which will inevitably encounter the deformation and stability of cutting cliff debris and residual soil slopes. And this will be one of the important technological problems to be solved in a quite long time at present and even in the future. Combining with the research task Researching on the deformation and stability of deep excavated cuts and high filled embankment of the Traffic Department in Fujian Province, based on the residual soil slope project on the project site at K15 +183 of Yong- Zhang highway (Yong’an section), adopting non-linear theory, modern monitoring technology and numerical simulation technology, the deformation and stability of cutting cliff debris and residual soil slopes have been studied systemically and synthetically in the thesis. At the same time theory analysis, the analysis and estimate of field monitoring are taken into account in this course. Main research work and working achievement are summed up as follows:(1)With the acquaintance of the trends and development about the deformation and stability of slopes at home and abroad, slopes are classified and summarized systemically. In order to offer the guidance to the deformation and stability of cut slopes, the geological mode and the mode of failure of cut slopes have been analysed, considering the influence of the deformation and stability of soil slopes. (2)By building geological models and mathe-mechanical models, this context has created a clear valuation approach in research, It concluded the deformation and stability of cutting cliff debris and residual soil slopes. Using the balanced method of the utmost limits analytic method (analytic method and simplified Bishop method) and numerical analysis method (non-linear finite element Ansys). And combining with compound analysis, this thesis has calculated and estimated the deformation and stability of slopes of the cliff debris and residual soil slope project on the project site at K15 +183 of Yong’an section of Yong- Zhang highway; (3)In the course of the cut slope excavation Inner displacement has been in control of real time field monitoring. It has analysed the development of inner soil mass displacement, and also analysed the rule<WP=8>of development of displacement of inner soil body of the slope. (4)Based on current research fruits, corresponding calculated procedure was programmed, which was calculated, analysed and compared. Its validity and applicability is validated by the different displacements of the slope of the project site at K15 +183 of Yong’an section of Yong-Zhang highway. (5)By the simulation and analysis of large-scale non-linear finite element soft Ansys, Not only the real tine stress- strain relation with each excavation time step is analysed, but also corresponding with the routes of the actual clinometers are simulated. The result is similar to the facts, which is approved by the simulated calculation and analysis to the each excavation time step. (6)It also uses synthetically monitoring method and utmost limits analytic theory. Through the optimized calculation and analysis of primary designed rate of slope and geometry shape at K15 +183 of Yong’an section of Yong- Zhang highway, the satisfactory achievement is obtained.The calculating and analysis results are shown as follows:1.The cut slope natural stability is higher and its stability safety factor is 1.47~1.592.The maximum lateral displacement is 4.70 cm (NLFEP)~5.38 cm (Ansys) after the excavation of the slope, it’s more close with actual values, at the same time the resilience phenomenon will appear at the top of slope in the later excavation of the slope3.The number value results indicate: with the excavation step number increasing, the major and minor principal stress values of the slope are adjusted constantly,更多还原