本文選題：TOUGH-FLACD + 地面沉降�。� 參考：《水文地質(zhì)工程地質(zhì)》2017年02期

【摘要】：基于部分耦合原理,采用TOUGH2和FLAC~(3D)建立抽水引起的三維地面沉降彈塑性模型,模型中綜合考慮土體的彈塑性變形特征、滲流-應(yīng)力的雙向耦合作用以及參數(shù)的非線性,探討了持續(xù)抽水和脈沖抽水兩種抽水過程中地面沉降發(fā)展演化過程。研究結(jié)果表明:(1)集中抽水停止后地面沉降會發(fā)生回彈,抽水中心沉降量不斷減小。由于水平方向存在水力梯度,地下水繼續(xù)向地下水位漏斗中心滲流從而導(dǎo)致沉降漏斗的范圍仍繼續(xù)擴大;(2)脈沖抽水導(dǎo)致土體的孔隙水壓力、滲透系數(shù)以及沉降量均呈周期性波動變化,地面沉降會局部回彈,但總體仍隨著抽水的持續(xù),沉降量不斷增加;(3)在抽水量相同前提下,對比持續(xù)抽水與脈沖抽水兩種方式引發(fā)的塑形沉降量可知,抽水速率小、脈沖式多次開采導(dǎo)致的塑性沉降量較小,持續(xù)抽水的抽水速率越小、脈沖抽水間隔越短越有利于控制地面沉降。研究成果為地面沉降數(shù)值模擬提供了一種新方法,其中算例研究能為抽水條件下地面沉降的控制提供參考。
[Abstract]:Based on the principle of partial coupling, a three-dimensional elastic-plastic model of land subsidence induced by pumping is established by using TOUGH2 and FLAC3D. The elastoplastic deformation characteristics of soil, the two-way coupling of seepage and stress and the nonlinearity of parameters are considered in the model.The evolution process of land subsidence in the process of continuous pumping and pulsed pumping is discussed.The results show that when the concentrated pumping stops, the land subsidence will rebound and the subsidence of the pumping center will decrease.Due to the existence of hydraulic gradient in the horizontal direction, the groundwater continues to flow to the center of the funnel of the groundwater table, thus causing the settlement funnel to continue to expand the scope of the subsidence funnel.) the pulse pumping results in the pore water pressure of the soil.The coefficient of permeability and the amount of settlement fluctuate periodically, and the land subsidence bounces back locally, but as a whole, with the continuous pumping, the settlement increases continuously) under the condition of the same pumping capacity,Compared with the plastic settlement caused by continuous pumping and pulse pumping, it can be seen that the pumping rate is small, the plastic settlement caused by pulse multiple mining is smaller, and the pumping rate of continuous pumping is smaller.The shorter the pulse pumping interval, the better the control of land subsidence.The research results provide a new method for numerical simulation of land subsidence, and the numerical examples can provide a reference for the control of land subsidence under pumping conditions.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(U1503282,41672229,41172206)
【分類號】：P642.26

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