义子头滑坡治理设计及数值模拟研究
发布时间：2018-11-19 18:48
【摘要】：本文以银百高速(G69)罗圈沟段义子头滑坡为研究对象,概述了滑坡所在地的气象水文、地形地貌、地层岩性、地质构造等工程地质条件,并通过前期的资料收集、野外实地调绘、钻探及室内试验等手段,对滑坡稳定性和变形机理进行研究,采用极限平衡法对该滑坡进行了稳定性评价和滑坡下滑推力计算,同时对该滑坡进行二维数值模拟,得到其应力、应变、位移云图及稳定性系数、,最后结合滑坡与实际工程的关系对该滑坡进行了治理设计并对该治理方案进行数值模拟,以此来验证具体治理设计方法的合理性。论文的主要研究内容和研究成果如下:(1)根据野外滑坡工程地质调绘和勘探可知,按滑体规模及物质组成划分,义子头滑坡属于巨型黄土滑坡。义子头滑坡在平面上呈簸箕状,滑体中下部较厚,上部较薄,整体形态清晰明显,滑坡表面呈台阶状的一面坡延伸至滑坡前缘,在滑体中后部可见多个次级滑坎及串珠状落水洞、张拉裂缝等。(2)采用极限平衡法对该滑坡在天然工况和降雨工况下分别进行了稳定性计算,由稳定性结果知,在正常工况下,两剖面整体都处于基本稳定~稳定状态;在降雨工况下,Ⅰ—Ⅰ’剖面前部的次级滑面处于不稳定状态,Ⅱ—Ⅱ’剖面后部的沿路基边坡的新剪出口处于不稳定状态。(3)使用Midas/GTS对该滑坡的两个剖面进行二维模拟分析,得到其应力、应变、位移云图及稳定性系数,分析后可知,该滑坡Ⅰ—Ⅰ’剖面的应变和位移主要集中在滑坡前部的次级滑面处,Ⅱ—Ⅱ’剖面的应变和位移主要集中在路基边坡处的新剪出口。对比极限平衡法的结果可知数值模拟结果与其基本吻合。(4)根据滑坡治理原则和该滑坡的基本特征并结合与公路的关系等,确定对义子头滑坡采用抗滑桩+削方,并对该治理方案进行数值模拟,结果显示相对于滑坡治理前滑体的应变和位移都大大减小,且桩顶位移小于允许位移量,滑坡稳定性系数明显提高,滑坡处于稳定状态。这些都表明该滑坡的治理方案合理、防护效果较好。数值模拟同时得到了该滑坡抗滑桩的剪力和弯矩云图,从云图中可以直观的看到抗滑桩在滑面附近和锚固段中部的内力最大,这可以用于指导抗滑桩的配筋计算。
[Abstract]:Taking Yizitou landslide in Luohuangou section of YinbaiExpressway (G69) as the research object, this paper summarizes the engineering geological conditions such as meteorology and hydrology, topography and geomorphology, stratigraphic lithology, geological structure and other engineering geological conditions in the site of the landslide. The stability and deformation mechanism of the landslide are studied by means of field mapping, drilling and laboratory test. The stability evaluation and slide thrust calculation of the landslide are carried out by using the limit equilibrium method. At the same time, the stress, strain, displacement cloud map and stability coefficient of the landslide are obtained by two-dimensional numerical simulation. Finally, the control design of the landslide and the numerical simulation of the treatment scheme are carried out in the light of the relationship between the landslide and the actual engineering. To verify the rationality of the specific governance design method. The main research contents and results are as follows: (1) according to the field landslide engineering geological survey and exploration, according to the size and material composition of the landslide, Yizitou landslide belongs to the giant loess landslide. The Yizitou landslide is dustpan shape on the plane, the middle and lower part of the slide body is thicker, the upper part is thinner, the whole form is clear and obvious, and the slope on the surface of the landslide extends to the front edge of the landslide. In the middle and back of the slider, there are many secondary sliders and beaded caverns, tension cracks and so on. (2) the stability of the landslide under natural and rainfall conditions is calculated by using the limit equilibrium method, and the results of stability are obtained. Under normal working conditions, the whole of the two sections is in a stable to stable state. Under rainfall conditions, the secondary slip surface in front of 鈪，
本文编号：2343113
[Abstract]:Taking Yizitou landslide in Luohuangou section of YinbaiExpressway (G69) as the research object, this paper summarizes the engineering geological conditions such as meteorology and hydrology, topography and geomorphology, stratigraphic lithology, geological structure and other engineering geological conditions in the site of the landslide. The stability and deformation mechanism of the landslide are studied by means of field mapping, drilling and laboratory test. The stability evaluation and slide thrust calculation of the landslide are carried out by using the limit equilibrium method. At the same time, the stress, strain, displacement cloud map and stability coefficient of the landslide are obtained by two-dimensional numerical simulation. Finally, the control design of the landslide and the numerical simulation of the treatment scheme are carried out in the light of the relationship between the landslide and the actual engineering. To verify the rationality of the specific governance design method. The main research contents and results are as follows: (1) according to the field landslide engineering geological survey and exploration, according to the size and material composition of the landslide, Yizitou landslide belongs to the giant loess landslide. The Yizitou landslide is dustpan shape on the plane, the middle and lower part of the slide body is thicker, the upper part is thinner, the whole form is clear and obvious, and the slope on the surface of the landslide extends to the front edge of the landslide. In the middle and back of the slider, there are many secondary sliders and beaded caverns, tension cracks and so on. (2) the stability of the landslide under natural and rainfall conditions is calculated by using the limit equilibrium method, and the results of stability are obtained. Under normal working conditions, the whole of the two sections is in a stable to stable state. Under rainfall conditions, the secondary slip surface in front of 鈪，
本文编号：2343113
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