【作者】 何惠军；

【导师】 杨荣丰； 肖拥军；

【作者基本信息】 湖南科技大学 ， 地质资源与地质工程， 2011， 硕士

【摘要】 三峡工程已于2003年开始蓄水,但是三峡库区的斜坡地质问题仍没有完全解决,该区是滑坡等地质灾害的多发地带,而巴东县新城区是三峡库区地质条件最为复杂的地区之一,巴东组第三段也是三峡库区滑坡发育的主要易滑地层之一。区内发育多个大型滑坡,较为典型的有赵树岭滑坡、红石包滑坡、黄土坡滑坡等多发生在该段,斜坡稳定性问题对人民生命财产安全造成了很大的威胁。因此,对巴东新城区库岸岩质滑坡变形进行研究,具有非常重要的理论价值和社会意义。本文在资料收集和现场调研等工作的基础上,结合巴东新城区的地形地貌、地层岩性、地质构造等特点,对区内大型滑坡进行的统计分析,研究该区岩质滑坡变形机制,并选取枣子树坪滑坡进行稳定性评价和数值模拟,分析不同工况下滑坡稳定性情况。论文取得了以下主要成果包括:（1）通过对资料的收集统计和野外实地踏勘的情况,对巴东新城区的大型滑坡滑体、滑带进行统计分析,研究区内发育在巴东组第三段内的滑坡多发育软弱夹层,软弱夹层内物质多为粘土、粉质粘土,粘土矿物主要由绿泥石、伊利石、高岭石、蒙脱石、石英、长石及方解石组成。（2）通过结合前人的工作,对该区滑坡进行成因分析和滑带演化过程研究。影响库岸岩质滑坡稳定性的主要因素包括地形地貌、地质构造、地层岩性、库水位升降、降雨、地震以及人类工程活动。（3）选取研究区内典型滑坡——枣子树坪滑坡为研究对象,通过极限平衡原理（简布法、Morgenstern-Price法、不平衡推力传递系数法）对其进行不同工况下的稳定性分析,并结合FLAC^3D数值模拟方法,分析滑坡的位移情况和应力分布特征。研究结果表明,库水位变化、地震与降雨对滑坡的稳定性影响很大。更多还原

【Abstract】 The Three Gorges Reservoir has been used for water storage since the year 2003, however, the geological problome of bank slope in Three Gorges Reservoir area is still not completely solved. It is because The Three Gorges Reservoir area is a region prone to geological hazards such as landslides, and especially The new Badong city which is a disitrict with the most complicated geological conditions. The third Member of Triassic Badong Formation is one of the tipical landslide formation zone in The Three Gorges Reservoir area. There exists plenty of large landslides, i.e.the tipical slopes Huangtupo landslide, Zhaoshuling landslide mostly happened there. The slope stablity issue keeps to be the significant problem threating lives and preoperty of local people, therefore the research on Reservoir bank slope deformation stability of new Badong city is with theoretical value and social significance.In the thesis, with the study of new Badong city topography, lithology, geological structure and other characteristics, statistical analysis of large-scale landslide based on data collection, the field suvey, and other work has been made as for the research of landslide deformation mechanism of rock in the area, a typical slope, a large-scale landslide in date trees has been taken into evaluation and numerical sitmulation to analyze its stability under different conditions. Through the above-mentioned research, the conclusions can be drawn as follows:(1)According to the statistical analysis of large landslides and deformed bodies in new Badong city via the field suvey, data collection, bank rock slope of the third Member of Triassic Badong Formation in the study region is main consist of Weak interlayer material, mostly clay, silty clay which mainly composed of chlorite, illite, kaolinite, ymontmorillonite, quartz, feldspar and calcite.(2)Combining with initial efforts of processors, the formation of the landslide are analyzed and the research on the landslide slip zone evolution is carrying out. From the research it includes that main factors influencing slope stability and correspondingly of the reservior rock include Topography, geological structure, Stratum lithology, water level fluctuation, rainfall, earthquakes and ther human project activities, in accordance with landform and geologic formation etc.(3)Selecting dates landslide in the study area as the research object, its stability is analyzed under different conditions by the limit equilibrium principle (briefing method, Morgenstern-Price method, unbalanced thrust transfer coefficient), and landslide displacement and stress distribution situation combined with FLAC3D numerical simulation are analyzed. The results showed that the reservoir water level change, earthquakes and rainfall of the area have a great effect on the stability of landslides.更多还原