陡倾岩质边坡灾变机理及风险评估
发布时间：2018-11-09 16:52
【摘要】：随着山区高速公路的不断发展,陡倾角的岩质边坡也越来越多,由于受地形地貌、地质特征、降雨作用等多种因素的影响,其灾变破坏机理比较复杂,在工程建设的过程中,往往会因为对其灾变破坏机理认识的不足而导致防护工程的失败。因而,深入开展陡倾岩质边坡灾变机理的研究,对于陡倾岩质边坡的风险评估、工程防护以及滑坡治理来说,有着非常重大的意义。本文以綦万高速公路K24+800段滑坡工程为依托,采用理论分析与数值模拟相结合的手段,对陡倾岩质边坡的灾变破坏机理及风险评估进行了深入研究,得到的如下成果：①结合岩质边坡几种常见的破坏类型,总结了影响陡倾岩质边坡稳定性的因素,分析了陡倾岩质边坡的基本破坏模式、平面受力状态以及其灾变破坏机理,认为其是滑移一弯曲破坏,即屈服性破坏,并将其灾变破坏过程划分为卸荷回弹、拉裂下错、挤压弯曲与整体滑动四个阶段。②以綦万高速公路K24+800段滑坡工程为背景,系统地分析了滑坡区的水文地质条件,阐述了滑坡的变形特征与结构特征,对其变形破坏的原因进行了深入的研究与分析。③选取K24+800段滑坡最为典型的Ⅲ-Ⅲ断面,采用离散元程序UDEC对其灾变破坏的过程进行了有效的模拟。通过对不同计算时步下坡体的最大不平衡力图、速度矢量图、位移矢量图、应力图以及塑性区分布图进行综合分析,总结出陡倾岩质边坡的破坏主要是剪切破坏,由于上部岩体沿软弱面的滑移破坏导致了下部岩体的挤压弯曲(剪切)破坏,最终造成了边坡的整体失稳。④基于模糊数学理论,选取了合适的评估指标,采用AHP法确定各分类指标和基础指标的权重值,提出并建立了岩质边坡的二级模糊综合评判模型,并用其对綦万高速公路K24+800段滑坡进行风险评估,模型的最终评估结果与工程实际较为吻合,具有一定的指导意义。
[Abstract]:With the continuous development of highway in mountainous area, there are more and more rock slopes with steep dip angle. Due to the influence of many factors, such as topography, geological features, rainfall and so on, the catastrophic failure mechanism is quite complex, and in the process of engineering construction, The failure of protective engineering is often due to the lack of understanding of its catastrophic failure mechanism. Therefore, it is of great significance for the risk assessment, engineering protection and landslide control of steep slope to deeply study the catastrophic mechanism of steep dip rock slope. In this paper, based on the landslide engineering of K24,800 section of Qi-Wan Expressway, the catastrophic failure mechanism and risk assessment of steep inclined rock slope are deeply studied by means of theoretical analysis and numerical simulation. The results obtained are as follows: 1 combined with several common failure types of rock slope, the factors influencing the stability of steep dip rock slope are summarized, and the basic failure mode, plane stress state and catastrophic failure mechanism of steep dip rock slope are analyzed. It is considered that it is sliding bending failure, that is, yield failure, and the process of catastrophic failure is divided into four stages: unloading and springback, tension crack down fault, extrusion bending and integral sliding. 2. The landslide engineering of K24,800 section of Qiqi Expressway is taken as the background. The hydrogeological conditions of landslide area are systematically analyzed, the deformation and structural characteristics of landslide are expounded, and the causes of deformation and failure are deeply studied and analyzed. 3 the section 鈪，
本文编号：2321009
[Abstract]:With the continuous development of highway in mountainous area, there are more and more rock slopes with steep dip angle. Due to the influence of many factors, such as topography, geological features, rainfall and so on, the catastrophic failure mechanism is quite complex, and in the process of engineering construction, The failure of protective engineering is often due to the lack of understanding of its catastrophic failure mechanism. Therefore, it is of great significance for the risk assessment, engineering protection and landslide control of steep slope to deeply study the catastrophic mechanism of steep dip rock slope. In this paper, based on the landslide engineering of K24,800 section of Qi-Wan Expressway, the catastrophic failure mechanism and risk assessment of steep inclined rock slope are deeply studied by means of theoretical analysis and numerical simulation. The results obtained are as follows: 1 combined with several common failure types of rock slope, the factors influencing the stability of steep dip rock slope are summarized, and the basic failure mode, plane stress state and catastrophic failure mechanism of steep dip rock slope are analyzed. It is considered that it is sliding bending failure, that is, yield failure, and the process of catastrophic failure is divided into four stages: unloading and springback, tension crack down fault, extrusion bending and integral sliding. 2. The landslide engineering of K24,800 section of Qiqi Expressway is taken as the background. The hydrogeological conditions of landslide area are systematically analyzed, the deformation and structural characteristics of landslide are expounded, and the causes of deformation and failure are deeply studied and analyzed. 3 the section 鈪，
本文编号：2321009
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