邢汾高速类土质边坡经两次削坡对比分析
发布时间：2018-08-24 15:54
【摘要】：类土质边坡是当前边坡领域的一种新型边坡，属于人工边坡的范畴，本文研究的类土质边坡是通过开挖天然地面形成的路基。在邢汾高速类土质边坡的一次削坡结束后，土体受到了一定的扰动使得一部分边坡发生了轻微的垮塌现象。为保证工程的安全性，决定进行二次削坡。 作者以邢汾高速类土质路堑高边坡稳定性分析与支护研究项目为依托，经过现场勘察，总结了地层岩性、工程地质特征，建立二维FLAC-2D节理化模型。通过现场勘察—节理分析—数值模拟—稳定性分析这一基本研究方法，，选取九组代表性边坡，对类土质路堑边坡开挖进行模拟，从理论角度对比了在两组节理的共同作用下一、二次削坡前后路堑应力场、位移场和安全系数，探究边坡的稳定性。希望对日后的实际工程实践提供一定的借鉴。 类土质路堑边坡内部存在有软弱结构面和节理面，并对其稳定性起主要控制作用。目前，FLAC软件大部分应用于处理简单层理边坡的分析中，在处理包含不同岩质多组节理的复杂边坡上存在一定的局限性。本文在运算过程中采取了“不同节理分开建模，数据分析权重求和”的方法进行数据处理，通过对一、二次削坡前后坡体监测点的位移场和应力场进行对比分析，并综合安全系数，得出了二次削坡能够提高此边坡坡体稳定性的重要结论。
[Abstract]:The soil-like slope is a new type of slope in the field of slope at present and belongs to the category of artificial slope. The soil-like slope studied in this paper is a subgrade formed by excavation of natural ground. At the end of a slope cutting at Xingfen high speed soil-like slope the soil was disturbed to a certain extent and some of the slopes collapsed slightly. In order to ensure the safety of the project, it was decided to cut the slope twice. Based on the research project of stability analysis and support of high speed soil-like cutting slope in Xingfen, the author summarizes the stratigraphic lithology and engineering geological characteristics, and establishes a two-dimensional physical and chemical model of FLAC-2D joint. Through the basic research method of field survey, joint analysis, numerical simulation and stability analysis, nine groups of representative slopes are selected to simulate the excavation of soil-like cutting slopes. The stress field, displacement field and safety factor of the cutting before and after the second slope cutting are studied to explore the stability of the slope. Hope to provide some reference to the practical engineering practice in the future. There are weak structural planes and joints in the slope of soil-like cutting, which play a major role in controlling the stability of the slope. At present, most of FLAC software is used in the analysis of simple bedding slope, and there are some limitations in the treatment of complex slope with different rock mass and multiple joints. In this paper, the method of "separate modeling of different joints and summation of data analysis weights" is adopted in the operation, and the displacement field and stress field of slope body monitoring points before and after the first and second slope cutting are compared and analyzed. By synthesizing the safety factor, it is concluded that the secondary slope cutting can improve the stability of the slope.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14
本文编号：2201300
[Abstract]:The soil-like slope is a new type of slope in the field of slope at present and belongs to the category of artificial slope. The soil-like slope studied in this paper is a subgrade formed by excavation of natural ground. At the end of a slope cutting at Xingfen high speed soil-like slope the soil was disturbed to a certain extent and some of the slopes collapsed slightly. In order to ensure the safety of the project, it was decided to cut the slope twice. Based on the research project of stability analysis and support of high speed soil-like cutting slope in Xingfen, the author summarizes the stratigraphic lithology and engineering geological characteristics, and establishes a two-dimensional physical and chemical model of FLAC-2D joint. Through the basic research method of field survey, joint analysis, numerical simulation and stability analysis, nine groups of representative slopes are selected to simulate the excavation of soil-like cutting slopes. The stress field, displacement field and safety factor of the cutting before and after the second slope cutting are studied to explore the stability of the slope. Hope to provide some reference to the practical engineering practice in the future. There are weak structural planes and joints in the slope of soil-like cutting, which play a major role in controlling the stability of the slope. At present, most of FLAC software is used in the analysis of simple bedding slope, and there are some limitations in the treatment of complex slope with different rock mass and multiple joints. In this paper, the method of "separate modeling of different joints and summation of data analysis weights" is adopted in the operation, and the displacement field and stress field of slope body monitoring points before and after the first and second slope cutting are compared and analyzed. By synthesizing the safety factor, it is concluded that the secondary slope cutting can improve the stability of the slope.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14
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