【作者】 陈萍；

【导师】 许江；

【作者基本信息】 重庆大学 ， 采矿工程， 2002， 硕士

【摘要】 长江三峡水利枢纽工程建成蓄水后，库区坝前水位将由现在的几十米海拔高程提高到175m，且由于防洪的需要，库水水位每年还将在175m与145m之间进行周期性调节，这无疑将导致部分古滑体的复活和新滑体的产生，结果势必会对未来三峡库区范围的城镇建设、交通运输、人民生命财产安全等造成一定的影响。因此，有必要针对三峡库区的实际情况，深入系统分析岸坡滑体的稳定性，为确定岸坡滑体整治工程措施提供理论依据。本文针对长江三峡库区特殊的地质环境与工程实际情况，在充分考虑水对库岸滑体稳定性影响的前提下，提出了一个适用于长江三峡库岸滑坡体稳定性分析的综合分析评价体系，并取得了如下几个方面具有工程实际意义和一定科学研究价值的研究成果：(1)研究结果发现，水的活动是新滑坡形成或古滑坡复活的主要因素，一方面是由于地下水位升高降低了滑坡体的有效应力，另一方面是由于地下水的长期浸泡降低滑体及滑带的力学强度，这两方面的因素均将直接降低滑坡的稳定性；(2)针对三峡库区的特殊条件，系统分析了作用于三峡库区滑坡体上的力系和库水位在175m与145m间变化时滑体条块的受力变化，从而使对作用于滑坡体上的力系分析更科学、更全面；(3)通过对滑体处于旱季 (天然状态)、雨季 (暴雨或长期降雨状态)、175m库水位、地震以及库水位由175m调节下降至145m等各种不同情况的有机组合，本文系统地归纳总结出了10种典型计算工况，并具体给出了相应的作用荷载的计算方法，使在库区岸坡滑体稳定性分析评价时对计算工况选择及其作用荷载的计算更具规范性；(4)具体运用C++ Builder开发了关于滑坡体稳定性综合分析评价系统，使对滑坡体稳定性分析计算更方便、更准确；(5)将上述滑坡体稳定性综合分析评价系统应用于重庆市丰都县名山滑坡稳定性分析的具体事例中，分析结果表明，本文所提出滑坡体稳定性综合分析评价方法对三峡库区的滑坡稳定性分析是实用可行的。更多还原

【Abstract】 After the hydraulic project of the Three Gorges of the Yangtze River is completed, the water level in front of the dam of the Three Gorges Reservoir Area will be raised from the now several tens of meters to 175 meters. Furthermore, because of the needs of preventing floods, the water level of reservoir area will be adjusted periodically between 175 meters and 145 meters every year. This will inevitably cause the revival of part ancient landslides and the formation of new landslides, which will definitely influence the urban construction, the traffic transportation, the people’s life and property security, etc. in the Three Gorges Reservoir Area. Therefore, it is necessary, in view of the specific situations of the Three Gorges Reservoir Area, to analyze thoroughly and systemically the stability of the bank landslide, in order to provide the theoretical basis for coming up with the dredging measure of the bank landslide. This paper, in the light of the special geological environment and actual project situation of the Three Gorges Reservoir Area, puts forward a comprehensive analysis and evaluation system suitable for the stability analysis of the bank landslide of the Three Gorges Reservoir Area under the premise of thorough consideration of the water influence on the stability of the bank landslide, and obtains the following achievements in several aspects that have the practical application significance and certain scientific research value: (1) It is discovered that the water activity is the primary factor of the formation of the new landslide and the revival of the ancient landslide. On the one hand, the rising underwater level reduces the actual stress of landslide; on the other hand, the long time soaking of the underwater reduces the mechanics intensity of the landslide and the slide belt, both of which reduce directly the landslide stability;(2) In view of the special condition of the Three Gorges Reservoir Area , this paper analyzes systematically the forces acted on the landslide of the Three Gorges Reservoir Area and the force varieties acted on the divided landslide when the water level changes between 175 meters and 145 meters. Thus it is more scientific and comprehensive for the analysis of the forces acted on the landslide;(3) This paper summaries systematically 10 kinds of typical computation projects by organic combinations of different kinds of situations in the dry season( nature statue), rainy season(rainstorm or rains for a long time condition), with 175m water level in the reservoir, during the earthquake, with the water level of the reservoir adjusted from 175m to 145m and so on, and produces<WP=6>specifically the computational method of the corresponding loads. It is more standard for the selecting of the computation project and the computation of its loads to analyze and evaluate the bank landslide stability; (4) The comprehensive analysis and evaluation system of landslide stability is developed by using C++ Builder. It is more convenient and accurate for the analysis and computation of landslide stability; (5) The above comprehensive analysis and evaluation system of landslide stability is applied to the stability analysis of MingShan landslide in Fengdu County Chongqing. The analysis result indicates that the comprehensive analysis and evaluation method of landslide stability put forward in this paper is applicable and feasible to the landslide stability analysis of the Three Gorges Reservoir Area.更多还原