近年来，随着董家河煤矿开采深度的增加，开采环境日趋复杂，水压、地应力等不断增大，太原组下部煤层开采受到奥陶纪灰岩承压水的威胁将更加突出，如何有效预防和控制底板奥灰岩溶水害问题已变得十分迫切和重要。本文围绕带压开采条件下煤层底板突水的影响因素分析、采动支承压力数学模型的建立、流固耦合数值模型的建立、底板注浆改造工程设计依据等科学问题，综合运用理论分析、数值模拟、现场测试及实验室试验等技术途径，对渗流与应力耦合作用下底板采动破坏特征及突水机理展开了全面系统的研究，并取得了如下成果： （1）在分析董家河煤矿工程地质、水文地质及以往突水资料的基础上，系统研究了影响董家河煤矿5号煤层底板突水的主要因素，即奥灰岩含水层水头高度、含水层富水性、底板隔水层岩性、岩层组合特征、地质构造以及矿山压力等，董家河煤矿5号煤层底板突水是这些因素共同作用的结果，在这些影响因素中，地质构造和奥灰水头高度是主导因素、奥灰岩的富水性以及底板隔水层的组合特性是客观因素、采动矿压是促进因素、工作面的倾斜长度及开采面积是工程主观因素。 （2）利用本文的理论分析方法，把理论与现场实测相结合，对董家河煤矿5号煤层底板岩体受采动影响的局部深度进行现场实测，得到了带压开采条件下煤层底板采动破坏深度，实现了用理论方法解决现场实测的关键性技术问题。 （3）采用岩石损伤破裂过程渗流与应力耦合分析系统F-RFPA2D，建立了渗流场与应力场耦合作用下董家河煤矿5号煤层底板岩层结构数值模型，对底板采动应力与渗流影响进行数值模拟分析，揭示了煤层底板隔水层的采动破坏特征、应力分布及渗流特征，为深入研究董家河煤矿5号煤层底板突水规律提供了科学依据。 （4）通过本文的系统分析，将研究成果应用于董家河煤矿5号煤层22507工作面底板注浆加固改造工程中，采用流固耦合数值分析于底板水害防治技术实践，并结合模拟结果提出煤层底板注浆加固改造技术措施，实现了工作面安全回采，取得了巨大的经济效益和社会效益，为今后董家河煤矿乃至澄合矿区太原组下部5号煤层底板奥灰岩溶水害预测和预防提供了宝贵经验。

In resent years, with the increase of mining depth in the Dongjiahe coal mine, the mining environment is becoming more complex, the ground stress and water pressure are increasing constantly, the coal mining under the threat of ordovician limestone water has been outstanding in the lower Taiyuan Formation, it is very imminent and important how to efficiently prevent and control water disaster problem of ordovician limestone karst. This thesis centres on the influenced factors that affected floor water irruption, establishment of mathematical mechanical model coupling seepage field, establishment of fluid-solid coupling numerical model, the distribution of mine karst water inrush danger zone from floor and design consideration of floor gronting reforming engineering. Through comprehensive use of theoretical analysis, numerical simulation, in-situ test and laboratory testing, a systematic research were carried out about the influence of seepage and stress coupling on mining failure features and water inrush mechanism of seam floor, and the main work is as follow: (1) On the base of engineering geological and hydrogeological and the previous inrush data of Dongjiahe coal mine, the influenced factors that affected floor water irruption has been studied systematically in No.5 coal of Dongjiahe coal mine, including head pressure and the water abundance of Ordovician limestone, floor aquifuge lithologic, rock assemblage characteristics, geological structure and ground pressure and so on. The reasons for floor water invasion of No.5 coal of Dongjiahe coal mine is founded on the interactive effect of these factors, Including dominant factors which includes geological structure and head pressure, the subjective factors which includes the water abundance and rock assemblage characteristics, the promotion factors which includes ground pressure, the subjective factors which includes the inclined length and mining area of the coal face. (2) By using the method of theoretical analysis, the paper is the mutual combination of theoretical study and site measurement, based on field test research of mining distortion and failure character of coal seam floor, the evolutional regularity of mining destruction and the maximal failure depth for No.5 coal of Dongjiahe coal mine have been basically grasped, the key technological problems of field measurement is realized by theoretical method. (3) By using of the software of the coupling system of flow and solid in rock failure process anslysis(F-RFPA2D), the bottom board structure for No.5 coal of Dongjiahe coal mine is established based on coupling of seepage field and stress field, the numerical simulation was conducted for the influence of mining and seepage, the change law of mining failure features and percolation characteristics of seam floor aquifuge and is revealed, which provides the scientific basis that will be helpful to the further study for floor faultage's water regularity mining on the top of water pressured. (4) Through the systematic researching from the article, and applying researches all above to the grouting reinforcement project of floor aquifer in No.22507 working face of No.5 coal in Dongjiahe coal mine, the fluid-solid coupling numerical analysis method is used for water disaster control practice, and grouting reinforcement strengthening and rebuilding technical method based on simulated output was put forward, safety mining of No.22507 coal mining face has been realized at present, which have achieved enormous economic benefits and social benefits. These research results have provided the reference experience that will be helpful to the further prediction and prevention for floor water disaster of ordovician karst mining on the top of water pressured in Dongjiahe coal mine and even all over Chen-he coal mine area.