深层承压水降水回灌规律研究

Research on the Deep Confined Water Precipitation Recharge Patterns

以上海地铁某车站为工程背景,利用MIDAS数值计算软件,针对上海地区第二层承压水的抽取与回灌引起的地下水水位变化及地层沉降进行数值分析,分析中主要考虑的影响因素为承压水含水层厚度及回灌井滤管长度,采用双井降压双井回灌来模拟抽取与回灌共同作用效果。分析结果表明,回灌有利于保护地下水位减小沉降。在一定的抽灌井规格下,回灌保护区域内随着承压含水层的厚度增加,降压后的地下水位呈现先增大后减小的趋势,相应地层沉降则表现为先减小后增大;随着回灌井滤管长度的增加,地下水位单调增大地表沉降则单调减小。本文的成果对研究承压水抽取与回灌对环境的影响因素有较高指导价值。

In this paper, a nalysis software MIDAS is used to station of Shanghai metro is used as engineering background, and numerical aanalyze the groundwater level change and ground settlement caused by the extraction and recharge of the second layer of confined water in Shanghai area, the main consideration of the influence factors in the analysis are the aquifer thickness of the confined aquifer and the length of the filter tube in the recharge well, with double well step -down double well injection to simulate the extraction effect together with the recharge. The results indicate that recharge is beneficial to protect the underground water level and reduce ground settlement. Under a certain pumping Wells specifications, recharge protection area with the increase of the thickness of the confined aquifer, and groundwater level after the decompression showed a trend of decrease after the first increase, and the corresponding subsidence will decrease firstly after the pumping well specification. The groundwater level increases monotonically with the increase of the length of the filter pipe. The results of this paper have a high guiding value to study the factors influencing the environment of confining water extraction and recharge.