某水电站DM金洞采空区场地稳定性研究
摘要
某水电站具有水库长(库岸线200km)、两岸居民多(三万人)、地貌差异大、工程地质问题复杂多样等特点,沿岸分布有煤窑、金洞、防空洞等二十余处不同类型的采空区。大坝上游55km的DM金洞采空区规模最大,共集中分布37个采金洞,采金历史达百余年,下部金洞分布密集,上部地表民宅多。水库蓄水后DM金洞采空区将被淹没,在库水位升、降过程中金洞采空区内壁发生垮塌时,地面是否会发生变化,进而引起地表建筑物产生变形破坏,是库岸稳定性评价时需关注的重要工程地质问题。本次研究工作主要通过地质测绘、调查、试验及采空区场地渗流场、应力状态、变形状态的三维数值模拟等技术手段,研究和预测了采空区场地在水库蓄水后的破坏情况和影响范围,水库运行后也逐步得到了实践检验。本次研究成果为水库征地移民搬迁工作提供了重要依据,对同类工程项目具有借鉴意义,对规程规范的完善也有一定参考价值。
The hydropower station is a long reservoir with 200 km shoreline, more than 30,000 inhabitants on both sides, great different landforms, complex and diverse engineering geological conditions, and other characteristics. There are more than 20 different types of goaves along the banks, such as coal pits, gold mines and air-raid shelters. The 55 km long DMGold Mineson the upstream of the damis the largest goaf, which with 37 gold mines distributed densely and more than a hundred years of history. The gold mines are densely distributed underground, and there are many houses on the ground. The goaves will be submerged after the reservoir impoundment. Whether the ground will change when the inside wall of the goaves collapse during the process of reservoir water level rising and falling, and then cause the deformation and destruction of the surface buildings, is an important engineering geological problem to be concerned in the stability evaluation of the reservoir bank. Through geological mapping, investigation, test and three-dimensional numerical simulation of seepage field, stress state and deformation state of the goaves, this research has studied,analyzed and predicted the damage situation and influence scope of the goaves after reservoir impoundment, and the results has been gradually tested in practice after actual reservoir operation. The research results will provide an important basis for land expropriation and resettlement in the reservoir area, and it provides reference for similar projects and for the improvement of regulations and norms.
The hydropower station is a long reservoir with 200 km shoreline, more than 30,000 inhabitants on both sides, great different landforms, complex and diverse engineering geological conditions, and other characteristics. There are more than 20 different types of goaves along the banks, such as coal pits, gold mines and air-raid shelters. The 55 km long DMGold Mineson the upstream of the damis the largest goaf, which with 37 gold mines distributed densely and more than a hundred years of history. The gold mines are densely distributed underground, and there are many houses on the ground. The goaves will be submerged after the reservoir impoundment. Whether the ground will change when the inside wall of the goaves collapse during the process of reservoir water level rising and falling, and then cause the deformation and destruction of the surface buildings, is an important engineering geological problem to be concerned in the stability evaluation of the reservoir bank. Through geological mapping, investigation, test and three-dimensional numerical simulation of seepage field, stress state and deformation state of the goaves, this research has studied,analyzed and predicted the damage situation and influence scope of the goaves after reservoir impoundment, and the results has been gradually tested in practice after actual reservoir operation. The research results will provide an important basis for land expropriation and resettlement in the reservoir area, and it provides reference for similar projects and for the improvement of regulations and norms.
引文
[1]王玉涛.下伏采空区对水库坝基稳定性和渗漏性的影响[J].煤田地质与勘探,2016,44(4):86-92.
[2]张志沛,王红.某高速路下伏煤矿采空区稳定性分析[J].煤田地质与勘探,2005,33(1):46-48.
[3]王湘锋,李天斌,王小群.成都市大邑县干岩子滑坡成因机制及稳定性评价[J].水土保持研究,2006,13(1):92-94.
[4]胡新丽,DavidM.Potts,LidijaZdravkovic,等.三峡水库运行条件下金乐滑坡稳定性评价[J].地球科学,2007,32(3):403-408.
[5]李守礼,陈则连,付新平.采空区工程地质勘察设计实用手册[M].2004.
[2]张志沛,王红.某高速路下伏煤矿采空区稳定性分析[J].煤田地质与勘探,2005,33(1):46-48.
[3]王湘锋,李天斌,王小群.成都市大邑县干岩子滑坡成因机制及稳定性评价[J].水土保持研究,2006,13(1):92-94.
[4]胡新丽,DavidM.Potts,LidijaZdravkovic,等.三峡水库运行条件下金乐滑坡稳定性评价[J].地球科学,2007,32(3):403-408.
[5]李守礼,陈则连,付新平.采空区工程地质勘察设计实用手册[M].2004.