郭二庄9~#煤带压开采底板突水灰色风险评价

针对郭二庄井田下组9#煤带压开采中存在的底板突水风险影响因素的不确定性,采用灰色风险计算模型和方法,结合井田已有突水、出水点水位标高、矿井最大涌水量及单位涌水量等相关信息统计,构建灰色风险计算模型,对井田受采动影响后煤层底板发生突水风险的概率和风险性变异进行评价。计算结果表明郭二庄井田下组9#煤带压开采存在底板突水风险性大,煤层开采前应慎重作出避让和分区隔离开采、探治结合等有效的补救措施,减少突发水害事故的发生。     

米村矿一_1煤底板奥灰水突水危险性分析

带压开采过程中,防止底板突水是安全生产的关键.为了解突水原因,通过对生产现场地质资料进行疏理,并运用地质理论和矿山压力理论,对拟开采的一1煤层突水危险性进行了分析,认为煤层直接底板本溪组铝土质泥岩隔水层厚度过薄,井田内小断层比较发育,间接底板奥陶系灰岩的富水条件是矿井突水的主要因素.分析结果可为今后预测一1煤底板突水危险性提供理论依据.     

米村矿一1煤底板奥灰水突水危险性分析

带压开采过程中,防止底板突水是安全生产的关键.为了解突水原因,通过对生产现场地质资料进行疏理,并运用地质理论和矿山压力理论,对拟开采的一1煤层突水危险性进行了分析,认为煤层直接底板本溪组铝土质泥岩隔水层厚度过薄,井田内小断层比较发育,间接底板奥陶系灰岩的富水条件是矿井突水的主要因素.分析结果可为今后预测一1煤底板突水危险性提供理论依据.     

突水系数法在煤矿深部开采中的应用

结合目前的采煤实践,设想了突水系数公式的发展趋势。通过磁西一号井田实例,证实了突水系数法在预测开采深部煤层突水危险性评价中的局限性。表明在深部煤层突水危险性评价应用时,其它方法作为突水系数法的补充,可为含水层富水性较弱而突水系数较大的深部开采底板突水安全评价提供参考依据。     

开采煤层底板"四带"划分理论与实践

简述了国内外开采煤层底板突水机理的研究现状．基于损伤力学、断裂力学和矿山压力理论，在开采煤层底板“三带”划分理论基础上，提出了开采煤层底板“四带”划分理论，即开采煤层底板可以划分出I矿压破坏带；Ⅱ新增损伤带；Ⅲ原始损伤带；Ⅳ原始导高带．对比分析了上述2种理论的共同点和不同点，推导出开采煤层底板“四带”理论中各带厚度的计算公式，给出了底板突水判别方法．结合肥城煤田开采煤层底板探测实例，说明开采煤层底板“四带”存在的客观性．     

基于可拓物元模型的煤层底板突水危险性评价

针对深部煤炭资源开采受底板奥陶系灰岩高水压的威胁问题,基于可拓学理论将9个因素作为物元模型的事物特征,利用层次分析法确定影响底板突水各因素的权重,建立了底板突水四级危险性物元评价模型,确定合适经典域和节域,并对盘道煤业3210工作面进行了底板突水危险性评价。结果表明物元模型能够定量化反映突水危险性程度。根据该模型,3210工作面突水危险性等级为较安全,突水系数为0.024 5~0.026 0 MPa/m,远远小于构造破坏块段突水系数临界值。2种方法均表明煤层底板能有效阻隔奥陶系灰岩水,可以实现安全带压开采。     

王河煤矿矿井突水特征与防治水对策

王河煤矿位于荥巩矿区中部,单一开采太原组一1煤层,属带压开采,为荥巩矿区矿井水害最为严重的矿井之一.该矿自投产以来累计发生突水事故达50余次,并造成淹井2次.本文通过对王河井田地质、水文地质条件、突水点分布规律和突水强度特征的分析研究,阐明了矿井突水事故频发的原因,论述了地质构造条件、一1煤层底板隔水层厚度、含水层富水性、矿山压力、水压与突水的关系.在此基础上,提出了矿井防治水害的方法和措施,为今后该矿的安全生产指明了方向.     

王河煤矿矿井突水特征与防治水对策

王河煤矿位于荥巩矿区中部,单一开采太原组一1煤层,属带压开采,为荥巩矿区矿井水害最为严重的矿井之一.该矿自投产以来累计发生突水事故达50余次,并造成淹井2次.本文通过对王河井田地质、水文地质条件、突水点分布规律和突水强度特征的分析研究,阐明了矿井突水事故频发的原因,论述了地质构造条件、一1煤层底板隔水层厚度、含水层富水性、矿山压力、水压与突水的关系.在此基础上,提出了矿井防治水害的方法和措施,为今后该矿的安全生产指明了方向.     

冯营矿矿井突水机理分析

针对冯营矿矿井水文地质条件复杂、水害严重的现状,研究了矿井充水水源、充水通道等充水条件,认为石炭系L8灰岩水、顶板砂岩空隙裂隙水和L2灰岩水是主要充水水源,断裂构造是主要的导水通道．研究表明：煤层顶板砂岩含水性相对较弱,太灰和奥灰含水层属中等-强富水性;断裂构造是沟通煤层底板太原组L8,L2灰岩和奥陶系（O2）灰岩的主要通道,也是矿井突水且突水量较大的主要因素之一．井田断层发育且导水良好,形成矿井突水的潜在威胁;对煤层底板采动裂隙影响的计算表明其有效隔水层较薄,加之矿压对底板的破坏,可构成煤层底板导水通道．以上因素导致冯营矿水害频发．     

冯营矿矿井突水机理分析

针对冯营矿矿井水文地质条件复杂、水害严重的现状,研究了矿井充水水源、充水通道等充水条件,认为石炭系L8灰岩水、顶板砂岩空隙裂隙水和L2灰岩水是主要充水水源,断裂构造是主要的导水通道．研究表明：煤层顶板砂岩含水性相对较弱,太灰和奥灰含水层属中等-强富水性;断裂构造是沟通煤层底板太原组L8,L2灰岩和奥陶系（O2）灰岩的主要通道,也是矿井突水且突水量较大的主要因素之一．井田断层发育且导水良好,形成矿井突水的潜在威胁;对煤层底板采动裂隙影响的计算表明其有效隔水层较薄,加之矿压对底板的破坏,可构成煤层底板导水通道．以上因素导致冯营矿水害频发．     

Influential factors and control of water inrush in a coal seam as the main aquifer

In this paper, a combination of field measurement, theoretical analysis and numerical simulation were used to study the main control factors of coal mine water inrush in a main aquifer coal seam and its control scheme. On the basis of revealing and analyzing the coal seam as the main aquifer in western coal mine of Xiao Jihan coal mine, the simulation software of PHASE-2D was applied to analyze the water inflow under different influencing factors. The results showed that water inflow increases logarithmically with the coal seam thickness, increases as a power function with the permeability coefficient of the coal seam, and increases linearly with the coal seam burial depth and the head pressure; The evaluation model for the factors of coal seam water inrush was gained by using nonlinear regression analysis with SPSS. The mine water inrush risk evaluation partition within the scope of the mining field was obtained,through the engineering application in Xiao Jihan coal mine. To ensure the safe and efficient production of the mine, we studied the coal mine water disaster prevention and control measures of a main aquifer coal seam in aspects of roadway driving and coal seam mining.     

Risk assessment of fault water inrush during deep mining

With the gradual depletion of shallow coal resources, the Yanzhou mine in China will enter the lower coal seam mining phase. However, as mining depth increases, lower coal seam mining in Yanzhou is threatened by water inrush in the Benxi Formation limestone and Ordovician limestone. The existing prediction models for the water burst at the bottom of the coal seam are less accurate than expected owing to various controlling factors and their intrinsic links. By analyzing the hydrogeological exploration data of the Baodian lower seam and combining the results of the water inrush coefficient method and the Yanzhou mine pressure seepage test, an evaluation model of the seepage barrier capacity of the fault was established. The evaluation results show the water of the underlying limestone aquifer in the Baodian mine area mainly threatens the lower coal mining through the fault fracture zone. The security of mining above confined aquifer in the Baodian mine area gradually decreases from southwest to northeast. By comparing the water inrush coefficient method and the evaluation model of fault impermeability, the results show the evaluation model based on seepage barrier conditions is closer to the actual situation when analyzing the water breakout situation at the working face.     

高瓦斯煤层群保护层开采卸压效果数值模拟

为合理选择保护层,针对高瓦斯突出煤层群安全开采问题,分析了保护层开采的保护作用机理,即保护层开采可对被保护层起到卸压增透作用,改善被保护层的瓦斯抽放效果是解决煤与瓦斯突出问题及瓦斯灾害的重要技术手段;卸压对煤与瓦斯突出及瓦斯问题的解决具有决定作用.针对某矿高瓦斯突出煤层群生产地质条件,采用FLAC3D数值软件模拟2个非突出煤层作为保护层开采时的卸压效果,并对其进行了分析比较,研究结果可为保护层的合理选择提供参考依据.     

Time-domain characteristics of overlying strata failure under condition of longwall ascending mining

Ascending mining is one of the most effective ways to solve problems of water inrush, gas outburst and rock burst in coal seams mining. In order to reveal the law of motion and spatiotemporal relationship of overlaying strata, field measurement has been done in a mine. Long distance drillings were constructed from 4# coal seam to 6# coal seam at several certain typical positions, and movement and failure law of overlying strata after mining was analyzed by drilling video and observing the fluid leakage. Besides, we also analyzed the spatiotemporal development law of overlying strata failure with different mining heights and time intervals in the lower coal seam. The results show that: ascending mining is significantly affected by time-domain characteristics of overlaying strata failure after the lower coal seam’s mining, height equations of caving zone and fractured zone are given in this paper, and the feasibility of ascending mining was compartmentalized concretely according to the spatiotemporal relationship. Research methods and conclusions of this paper have certain referential significance for the study of ascending mining, mining under water, mining under building, mining under railway and stress-relief mining.     

岱庄煤矿近距离煤层微量元素赋存特征研究

煤矿开采的主要对象是煤层,煤层对比清楚与否,直接影响煤矿安全生产和经济效益.岱庄煤矿3上1、3上及3下煤层相距较近,区分不明显,容易造成采掘巷道串层现象.对岱庄煤矿可采煤层中微量元素赋存特征开展研究,掌握不同煤层中微量元素的赋存状况,可很好地判断岱庄煤矿煤层层位,能有效避免地质构造等因素造成近距离煤层采掘串层现象,对合理设计开采方案和采掘进度有重大意义,从而为岱庄煤矿安全、高效生产提供科学依据和保障.     

厚煤层全煤巷采区巷道布置关键技术研究

在分析煤矿开采过程中大量矸石排放造成矿区土地资源浪费、水资源破坏和大气污染现状的基础上，根据采煤技术发展现状，提出了厚煤层采区全煤巷布置系统，并对厚煤层采区煤层上山(或煤层大巷)的维护、采空区排水和防灭火等关键技术进行了研究，以实现厚煤层矿井的安全、高效、洁净开采。     

综合物探的奥陶系灰岩突水预警技术

为克服单一物探手段的局限,更准确地预测奥陶系灰岩突水风险,新安煤矿13151工作面采用瞬变电磁、直流电法、槽波地震和无线电波坑透等4种手段进行了综合物探.经比对物探结果,并结合地质与水文地质资料分析,4种物探异常区的重叠区域奥陶系灰岩水向上导升,低阻区条带分布,存在突水危险;煤厚变薄,可能受剪切滑动构造影响;槽波波速1 800 m/s以上,地应力(矿压)集中,利于围岩破坏.多种物探异常区的重叠区域的突水风险最大,是工作面防治水工作的重点.实例证明,综合物探可以弥补单一物探方法之不足,有效指导钻探验证、底板注浆及突水治理工作.     

青东矿10煤层水文地质特征及充水因素分析

为了评价10煤层开采可能产生的水害影响,根据矿井含、隔水层的水文地质特征,指出10煤层受采动破坏,顶底板砂岩裂隙水、太原组和奥陶系岩溶水沿采动裂隙和断层溃入矿井,对矿井开采形成威胁。根据对矿井充水因素的分析,得出矿井的充水强度不大,充水通道主要为隔水层薄弱地段采动裂隙和断层破碎带。