共查询到19条相似文献,搜索用时 63 毫秒
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桃园矿底板灰岩突水因素分析 总被引:3,自引:2,他引:1
在桃园矿抽水试验资料及观测太灰水位变化情况的基础上,分析了底板灰岩水突水的影响因素,结合矿井水文地质条件,分区域计算出不同标高的突水系数,提出了底板灰岩水的防治措施。 相似文献
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华北型煤田防治水工作难度很大,多数煤矿水害事故都与灰岩水有着直接或间接的关系,借鉴煤层瓦斯突出危险性分区的做法,提出并介绍了灰岩水突水危险性分区概念,创立了一种新的防治水技术管理平台,对煤矿底板灰岩水防治工作具有较好的指导作用。 相似文献
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为了研究赵家寨煤矿综采工作面断层对底板突水的影响,根据工作面水文地质条件和岩石力学性能等参数,运用岩石破裂过程分析软件RFPA2D-Flow,模拟不同倾角的正断层在采动影响下工作面底板的裂隙变化规律。模拟结果在一定程度上揭示了断层倾角对底板突水的影响规律。模拟结果表明,断层倾角越小,断层越容易活化与突水。 相似文献
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针对创日泊里煤矿生产中出现的工作面突水问题,从理论层面上分析了其发生原因,建立了断层影响下的工作面底板力学模型对其进行受力分析。采用RFPA2D-Flow软件建立了断层工作面的数值模型,通过模拟不同断层倾角以及正逆断层对工作面底板突水情况,得出不同断层对突水情况的影响。 相似文献
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采场底板断层突水判别方法 总被引:1,自引:0,他引:1
根据“以岩层运动为中心”的矿山压力理论,煤体在矿山压力作用下将出现非弹性区。矿山压力高峰应力在底板中的传播不是垂直向下的,而斜向煤壁前方。位于底板高峰应力线前方(煤壁前方)的岩石具有隔水性能,承压水只能通过断层从位于底板高峰线后方(采空区方向)的底板中突出。采场断层发生突水的条件为煤层开采造成的底板破坏深度不小于底板高峰应力线与断层交点的深度。 相似文献
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在开采干河井田2号煤层过程中曾多次发生断层突水事故,对矿井安全生产造成极大影响。通过对井田断层发育规律、主要含水层赋水特征及断层突水机理进行分析研究,总结出干河井田断层突水的规律,对今后煤层开采时防止断层突水具有现实指导意义。 相似文献
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为了研究在断层附近布置工作面时,底板突水的危险性,对断层附近底板的力学性质进行了分析,并进行了理论计算。结果表明,若P断
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Shichuan Zhang Weijia Guo Yangyang Li Wenbin Sun Dawei Yin 《Mine Water and the Environment》2017,36(3):443-451
Mine water inrush is very common in China and can cause hysteresis and severe damage. The entire process of crack formation, concealed fault propagation, and evolution of a water inrush channel with high pressure water directly beneath the mine floor was physically simulated based on fluid–solid coupling mechanics and solid materials research. Activated materials were used to simulate fault damaged rock, including soybeans, sand, Vaseline, and calcium carbonate. The results indicate that water channels are mainly caused by the connection between tectonic rock zones and coal floor cracks, which are the direct cause for water inrush. Furthermore, the lagging water inrush mechanism from the coal floor in a confined water body under both a stress field and a seepage field were revealed. The formation of the water inrush path with temporal and spatial variations was analyzed by interpreting the monitoring data and phenomena. The data showed that the floor stress in front of the working face increased and was affected by the abutment pressure, and that floor stress under the mined-out area began to decrease simultaneously. The stress of the upper wall showed a drastic drop while the stress of the footwall continued to decline and then stabilized after the water inrush. This work provides new approaches and knowledge for research on deep mining water inrush structures. 相似文献
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针对严重威胁矿井安全生产的底板突水事故,通过分析,研究断层对煤层底板突水的影响。结合山西焦煤集团介休正益煤业有限公司11号煤层实际地质构造以及断层特征,研究待开采的11号煤层的地质构造对地板突水影响。首先分析11号煤层断层构造的影响类型,然后对断层防隔水煤柱留设宽度进行计算,并分析隐伏陷落柱的影响。最后利用大井法对11号煤层突水量进行预测,并对11号煤层突水危险性进行评价。 相似文献
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宁武煤田北部平塑矿区煤矿开采受奥灰底板承压水威胁,由于奥陶系灰岩含水层富水性强、水压高、补给水源区域广、隔水层相对薄弱、区内断裂构造及陷落柱发育,致使该区煤层开采受奥灰水严重威胁。煤层开采时,对断层及陷落柱导通奥灰水的危险性分析与研究显得极为重要。文章结合担水沟煤矿9101工作面实际情况,做一些浅析。 相似文献
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Inrush of Ordovician limestone karst water through the mine floor occurs frequently in the Carboniferous-Permian coalfield in northern China. A probability index method was proposed to predict water inrushes using five indices: an aquifer water-bearing index, a structural index, an aquifuge index, an aquifer water pressure index, and an underground pressure index. Expert input was used to obtain weights for these five factors. Expert evaluation and statistical probability were then used to determine weights of the subsidiary factors, allowing the calculation of a water inrush probability index (I) and a threshold water inrush value for the Feicheng coalfield of 0.65. The Dempster-Shafer evidence theory was then used to determine a 74% degree of confidence for this prediction. Finally, the method was applied to the No. 9901 working face of the Taoyang coal mine. A subsequent 1,083 m3/h water inrush that occurred there aligned with the statistical results. 相似文献
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含水层水压对底板断层突水危险性的影响 总被引:2,自引:0,他引:2
随着煤矿开采深度的增加,受奥灰岩溶底板高承压水的威胁日趋严重,矿井突水事故的频率不断增加。建立了弹塑性多孔介质渗流应力耦合模型,并基于多物理场耦合模型软件COMSOL Multiphysics,结合徐州某矿突水实例,分析了含水层水压的变化对含断层底板突水危险性的影响。研究表明:随着含水层水压的增大,岩体介质的有效应力减小,岩体强度降低并容易产生塑性破坏;含水层水压越大,底板的塑性破坏区范围越大,含断层底板的突水危险性越大。研究结果可为承压水上采煤底板断层突水的防治提供参考。 相似文献
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某煤矿10#煤层底板标高为370~620 m,奥灰水位为517.88~520.96 m,低于奥灰岩溶水水位标高,奥灰含水层富水性强、水量大,属于强径流区。10#煤层底距奥灰界面平均距离只有34.81 m,奥灰岩溶水成为煤层底板突水的主要水源。介绍了底板突水的几个通道,分析了对应底板突水的几种防治水措施,最后采用回采工作面斜长缩小、隔水岩段隔水层加固与含水层改造、地面帷幕注浆截流与井田内疏水降压联合工作的防水措施,最终实现煤层在承压下的安全开采。 相似文献