库水位升降速率对雅安双家坪堆积体滑坡稳定性影响模拟分析

发布时间：2018-04-04 03:53

本文选题：滑坡　切入点：库水位升降速率　出处：《地质力学学报》2017年02期

【摘要】：水库蓄水后库岸边坡的稳定性一直是研究的热点,库水位周期性涨落使得坡体内部渗流场发生变化进而影响其应力场,应力场作用于岩土体产生变形,其中水库水位升降速率对滑坡稳定性的影响尤为显著。本文以瀑布沟水电站库区双家坪滑坡为研究对象,在调查分析的基础上,基于非饱和土力学理论,考虑水—土特征曲线与渗透特性,对库水作用下的双家坪堆积体滑坡稳态—瞬态进行渗流场—稳定性数值计算。运用GeoStudio软件中的seep模块模拟库水作用下滑坡体地下水变化,计算出不同库水位升降速率条件下堆积体滑坡内部渗流场的变化并将结果耦合至slope模块中进行稳定性计算,研究结果表明:水位抬升阶段,滑坡的稳定性表现为先升高再降低,且水位抬升速率越大,滑坡稳定性升高后衰减的程度越大;水位下降阶段,滑坡的稳定性表现为先降低再逐渐回升的趋势,且水位下降速率越大,滑坡稳定性下降后再回升的程度越低。该研究结果对于库区地质灾害防灾减灾、监测预警以及水库合理调蓄具有重要的意义。
[Abstract]:The stability of reservoir bank slope after reservoir impoundment is always a hot topic. The periodic fluctuation of reservoir water level causes the change of seepage field in the slope and then affects its stress field, and the stress field acts on the deformation of rock and soil.The effect of reservoir water level rise and fall rate on landslide stability is particularly significant.In this paper, the Shuangjiaping landslide in the reservoir area of Pubugou Hydropower Station is taken as the research object. On the basis of investigation and analysis, based on the theory of unsaturated soil mechanics, the characteristic curve and permeation characteristics of water-soil are considered.The steady-transient seepage field-stability of Shuangjiaping landslide under the action of reservoir water is numerically calculated.The seep module in GeoStudio software is used to simulate the groundwater change of landslide body under the action of reservoir water, and the variation of seepage field in landslide is calculated under the condition of different rise and fall rate of reservoir water level, and the results are coupled to the slope module to calculate the stability.The results show that the stability of landslide increases first and then decreases at the stage of water level uplift, and the greater the rate of water level uplift, the greater the degree of attenuation after the rise of the stability of the landslide, the lower stage of the water level,The stability of landslide shows the tendency of decreasing first and then rising gradually, and the more the rate of water level drops, the lower the stability of landslide is.The results are of great significance for geological disaster prevention and mitigation, monitoring and early warning and reasonable reservoir regulation and storage in the reservoir area.
【作者单位】：成都地质矿产研究所;
【基金】：中国地质调查局地质调查项目(1212011220131,121201010000150015)
【分类号】：P642.22

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