In the natural state , the confined water is mainly the palaeowater which was recharged in the past , and its circulation is slow ; but in the urban area where groundwater is exploited persistently , large volume of new water entered into the confined aquifer , and the rate of recharge from the upper aquifer accounts for 50 % 天然状态下，承压水为古地质时期补给形成的“古水” ，地下水交替缓慢；开采状况下，平原东部承压水受到了现代补给水的影响，潜水越流量占补给量的50 %左右。
Honghu lake has a little direct impact on groundwater , but the indirect impact of which is powerful . 3 . the impact on confined water from changjiang river is depressive with the distance to the riverside increasing . the confined water level changes differently in different season and region while the water level of changjiang river changes each unit 研究结果表明： 1 、地下水埋深较浅，月平均水位以年为周期变化，年平均水位变化较小； 2 、在近岸地区降水不是影响地下水的主要因素，洪湖对地下水的直接影响范围较小，间接影响大； 3 、长江对承压水的影响强度是随着距离增加而递减的，长江水位每变化一个单位，不同季节、地区的承压水位的响应变化不同。
As a whole , the research work of this dissertation can be summarized as follows : ( 1 ) based on the porous media elastic unstable theory , the interfering well flow model of soft soil two - layer structure underground confined water is inferred , and consequently , the basic dewatering calculation method of soft - soil two - layer deep excavation dewatering is inferred 具体研究内容如下： (一)从弹性多孔介质渗流理论出发，推导出二元结构承压含水层群井干扰稳定流模型，进而导出软土地区二元结构地层深基坑降水的基本计算方法。
The water level of changjiang river under the dam will change from present condition in different seasons after the three gorge project is finished , which will affect dynamic change of groundwater in the middle and lower reaches district because changjiang river has cut in the confined water layer everywhere , however , it will have a great influence to the whole ecologic environmental condition , especially to the soil ' s evolvement in sihu district , jianghan plain , due to dynamic change of groundwater 三峡工程建成后坝下江段流量、水位的季节分布将发生改变，由于长江在中下游多处切穿了承压含水层，长江干流水位的季节改变必然会造成地下水动态的变化，地下水动态变化又会影响到整个中下游流域的生态环境状况，特别是长江中游平原湖区的涝渍土壤的发展演化。
At the meantime , the rock mass may alternate between loading and unloading and it exists in certain kind of liquid , such as surface water , unconfined water , confined water etc for its intrinsic crannies . the practical rock mass concerned project must solve the key stability pr oblem after the understanding of the complicated mechanical characteristic and the deformation trends to guide the following project design and construction for the demand of security , economy , feasibility and validity . however , the intrinsic nonlinearness and complexity of the engineering rock mass become the main difficulty to predict the stability and deformation , the corresponding structure design must ensure enough safety with all the determinate or random force combination , so a model without the geometry distortion and constitutive equation warp is necessary to be built for the quantificational analysis of practical structure ' s stress , for the simulation of the real process and for the determinate evaluation system and optimization 由于实际工程岩体其固有的非线性和复杂性，使得求解对应的诸如其稳定性、变形等问题面临较大的困难，而有关的工程结构的设计必须保证该结构在外来因素的作用下具有足够的安全度、经济性和合理性，这必然要求对岩体及其工程结构的受力与变形有一套量化评判体系和优化技术，抓住实际工程问题的本质特征并建立可行的符合几何仿真、本构仿真、受力仿真、过程仿真四原则的求解模型，通过该模型的数值模拟成果来指导岩体工程的设计、施工及运营、管理；而岩体结构面的存在使得基于传统连续介质力学理论的理论分析和数值模拟面临巨大的挑战，物理模拟的试验周期和成本也大大增加，而岩土体工程问题则成为典型的数据有限、了解程度有限类问题，这类问题的解决需要综合应用理论分析、经验判断、物理模拟和数值模拟等方法，数值模拟可以完成目前许多技术手段无法完成的实验，如参数控制，复杂条件下的边界条件的处理，同时数值模拟具有高可重复性，且数值模拟的成本和人力开销等远低于物理模拟，因此研究岩土体工程问题的流形元数值模拟方法是一项具有理论和实际工程应用价值的重要课题。
