真空管井降水机理研究

发布时间：2018-06-14 23:49

本文选题：真空 + 渗流　；参考：《中国地质大学（北京）》2014年博士论文

【摘要】：本文对真空管井降水法引起的地下水真空渗流场的几个主要方面进行了研究,研究方法和主要结果如下：开展了现场实验研究。依托北京地铁14号线工程,开展了真空管井降水的现场实验,对出水量、真空度在水平和深度方向的传递、孔隙水压力以及真空沉降等方面进行了监测,得到了各项指标的变化规律。进行了真空度分布规律研究。在气体运动符合达西定律的前提下,对气体的平面渗流模型和Paul C.Johnson模型进行了分析,得到了井径、井室压力和影响半径等对真空度传递规律的影响。建立了饱和土孔隙水真空渗流场模型。将土体中气体的渗流规律与Dupuit等经典的地下水渗流理论相结合,得到了真空潜水完整井、真空承压水完整井以及真空潜水-承压水井作用下的出水量、水位和水头的分布、水力梯度的变化规律和解析解。为了验证理论分析的正确性,开展了室内抽水实验和数值模拟对理论分析模型进行了验证。对非饱和土孔隙水真空渗流进行了研究。通过分析孔隙水受力情况,得出了重力排水的极限条件；通过分析非饱和土孔隙水的渗流条件,分析了气体补充量对孔隙水排出的作用机制,并通过实验进行了验证；通过对非饱和土土水特征曲线的研究,提出了将进气值作为真空渗流场影响半径的观点：运用有限差分法,对非饱和土孔隙水一维水平真空渗流模型进行了求解。建立了真空条件下的沉降模型。基于真空度传递规律和水位分布模型,讨论了真空作用下仅考虑水位下降情况的沉降计算；建立了真空条件下的Imai模型、Chai J C模型、弹性力学模型和饱和土稳定渗流有效应力模型。进行了真空管井降水的沉降预测。运用回归分析法、灰色理论模型GM(1,1)法和BP神经网络法对真空降水现场实验的沉降数据进行了预测分析。对层间滞水真空渗流规律和降水方法进行了探讨。提出了层间滞水分布的3种形式：水平分布、凹陷分布和倾斜分布。提出了隔水层倾斜分布时真空井“爬坡”运行的降水施工方法。
[Abstract]:This paper studies several main aspects of groundwater vacuum seepage field caused by vacuum tube well precipitation method . The research methods and main results are as follows :

Based on line No . 14 of Beijing Metro Line 14 , the field experiment of vacuum tube well dewatering was carried out . The water output , the transfer of the vacuum degree in the horizontal and deep directions , the pore water pressure and the vacuum deposition were monitored , and the change law of each index was obtained .

According to Darcy ' s law , the plane percolation model and the Paul C . Johnson model of the gas are analyzed , and the influence of the well diameter , the pressure of the well chamber and the radius of influence on the degree of vacuum transfer is obtained .

In order to verify the correctness of the theoretical analysis , the theoretical analysis model is verified by means of indoor water pumping experiment and numerical simulation .

In this paper , the vacuum seepage of pore water in unsaturated soil is studied . By analyzing the stress of pore water , the limit conditions of gravity drainage are obtained .
By analyzing the seepage condition of pore water in unsaturated soil , the mechanism of gas replenish on pore water discharge was analyzed , and the experiment was verified .
Based on the study of the characteristic curve of unsaturated soil water , this paper puts forward the viewpoint that the inlet value is used as the influence radius of the vacuum seepage field : using finite difference method , the one - dimensional horizontal vacuum seepage model of unsaturated soil pore water is solved .

The settlement model under vacuum condition is established . Based on the rule of vacuum transfer and the model of water level distribution , the settlement calculation considering the decline of water level is discussed under vacuum .
The effective stress model of Imai model , model J C model , elastic mechanics model and saturated soil under vacuum condition is established .

Based on the regression analysis , the grey theory model GM ( 1,1 ) method and the BP neural network method are used to predict the settlement data of the vacuum precipitation field experiment .

In this paper , three forms : horizontal distribution , sag distribution and inclination distribution are put forward in this paper .
【学位授予单位】：中国地质大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：P641.2;TU463

【参考文献】