无论是地应力场宏观控制区域水文地质条件，还是微观影响含水介质的渗透特性，都有其深刻的内在发生机制，生产实例和实验室试验表明：在宏观地质大尺度下，岩层以破碎、位移适应地应力场变化并为地下水的富集及运动提供场所，地下水则以流动和压力传递来调整含水空间、扩张岩石裂隙实现流固宏观耦合，尽管地质历史时期构造应力场经历多起叠加改造，但形成区域主要构造骨架时的地应力场与渗流场具有相当的一致性，主渗透方向与最大水平主应力方向一致；在宏观地质中尺度下，应力变化剧烈区、极低地应力区、应力集中区、剪应力集中区等往往与含水介质的主干裂隙相一致，地应力均匀变化区则与基质的三重含水介质对应；在微观地质小尺度下，岩石空隙为三重孔隙介质，包括基质孔隙、裂缝孔隙和管道状孔隙，孔隙度和渗透率是有效应力的函数，孔隙岩块的孔隙度和渗透率随有效应力的变化关系符合指数型数学模型，裂缝型岩石宜用幂指数型数学模型描述，毛细管型岩石则用二次抛物线数学模型描述较为恰当。裂纹有效压缩系数、闭合压力计算揭示了裂缝性岩芯的渗透率和孔隙度损失较孔隙性岩芯损失大的机理，裂纹有效压缩系数计算还说明同一介质渗透率变化总是大于孔隙度变化；厚壁筒理论证实，实验得出的毛细管型岩石孔隙度和渗透率损失与有效应力的二次抛物线关系正确。

For better interpretation of geologic systems using information of 3-D seismic exploration, relations of rocks wave velocity and stresses are studied in rock physical experiment and practice applications. Geologic systems are made up of multi-phase, such as solid, liquid, gas, many kinds of mineral and different types of structures, whatever scale is, they can be simulated by generalized multiple porosity media geologic models, rock wave velocity is equivalent velocity of asymmetry geological systems at some scale. So, geologic settings are key dominate factors of media wave velocity at different scale. Weather in seismic exploration or in experiment, there are relationship of effective stresses with elastic modulus and wave velocity of rocks, coherence of seismic wave velocity and stresses will be base of further studying of geologic systems.

Because some problems could not be resolved, such as singular points, inhomogeneous media, unconfined aquifer, etc, applications of the boundary integral equation method (BIEM) to engineering, even to seepage simulation and management in porous media, get seriously influenced. In order to promote widely its applications, some improved projects have been developed and applied to practice aim at key techniques restricted its applications. (1) Problems of inhomogeneous media and unconfined aquifer could be completely solved by infinite series approach methods in implement of BIEM. It is shown by the case studies that the approach not only take full advantages of traditional BIEM, but also overcome effectively its deadly disadvantages and get enough accuracy. It should be used at suitable conditions; (2) Accuracy of BEM can be convinced by singular treatment and' double nodes one value method' is the best one in all methods; (3) It is shown by solving dewatering practice in a surface mine that compared with the embed method, the response matrix method has advantages of full using inherence relationship in hydraulic system, smaller restrict condition matrix, rapidly calculation. Combined with response matrix method, Laplace transform of BIEM can even more develop advantages of dimensional reduced in solving, being independent of time steps, less workload, excellent accuracy.

Based on their characteristics analyzing in detail of exterior shape and interior substance, basic control factors, hydrogeology and so on, mechanisms of water inrush from Karstic collapse columns is studied, excavation process of working face are simulated with FLAC3D when a collapse column exists in the coal floor. Numerical simulations and experiments show that: (1) because of the collapse column existed in the coal floor, stress and strain distribution are asymmetric, concentrating coefficients of stress become bigger, the closer distant with it, the bigger its influence, but influence for failure modes of rock masses is less. When the border cliff of the collapse column and division of compressive and expand zones on coal floor are superposition on the same line, that is the best state of shear yield and water inrush from coal floor takes place most often. (2) Rock failure mechanism under hydraulic pressure is shear-tension-pressure complex and giving priority to shear. When there is a Karstic collapse column in coal floor, mining pressure and seep intenerating as well as dilatancy cause fractures expanded in all directions. When value of hydraulic pressure is larger than that of the minimum principal stress on key stratum, fractures transfix at last and water inrush takes place.

For water inrush from Karstic collapse columns being effectively simulated and predicted, and prevented measures being effectively took in engineering design, such as design of working faces and water proof columns, the mechanical models for water inrush and the math models for water inrush volumeare studied. The results show that proper hydrogeological settingmake up of necessary condition of water inrush, proper mechanical basics are its sufficient condition, water inrush is caused by supplement each other of twoconditions. They can be imaged as 'thick wall cylinders' when analyzing mechanical basics, water inrush from roof and floor can be regarded as 'lid failure of thick wall cylinder', and water inrush from lateral wall of coal columns as 'lateral wall failure of the cylinder', hydraulic pressure and geo-stress in the paths of waterinrush are inner and outer pressures of the cylinder, thin plate and shear failure theory can be applied for different kinds of key strata, and criterions of water inrush can be separately derived, these are sufficientconditions, namely, water inrush happens when critical states being reached or exceeded based on necessary conditions. According to viewpoint of systems, KCCs are one kind of media in a mine groundwater systemof generalized multiple porous media seepage, and are also special hydro-geological subsystems in which Karstic groundwater is as their recharge, columns are flow pathways, and roadways or working facesare as their discharge. The properties of water-bearing in KCCs, on the other hand,are controlled and influenced by several conditions and factors, such as tectonic movement, groundwater flow conditions, substance, solid and cementation in the columns, as well as confined pressure. According to their hydrogeological propertiesand patterns, KCCs can be taken as equivalent channel models, which can be embedded into mine groundwater system of generalized multiple porous mediaseepage, their hydrogeological parameters can be calculated byinversion of the math models, and water inrush volume be predicted with the models.