共查询到19条相似文献,搜索用时 281 毫秒
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基于大埋深高承压岩溶水上巷道开拓近断层破碎带,底板岩层变形破坏加剧,导致有效隔水层厚度锐减,从而发生突水事故的规律特征。通过分析某煤矿下组煤首采区暗斜井开拓范围内岩体结构、力学性质等地质及水文地质条件,采用力学计算、数值模拟方法,对暗斜井开拓井巷底板岩层导水破坏深度及奥灰含水层导升带高度,进行了理论计算和数值模拟分析。结果表明,随着开挖深度的增加,底板破坏深度增加幅度不同,越接近断层底板岩层导水破坏深度越大。预测行人暗斜井施工至400 m时,存在底板突水隐患。根据井巷底板岩层破坏规律及水害预测结果提出了相应的水害防治措施,保证了暗斜井开拓工程的顺利施工。 相似文献
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李国富 《采矿与安全工程学报》2005,22(1):109-111
实践表明,当巷道通过有水力联系的松软破碎带、断层裂隙带或直接揭露含水层时,常造成掘进中或掘进滞后突水,影响矿井生产安全。通过巷道导水及突水机理分析研究,提出井巷预注浆强化围岩防突水为主和掘后封堵小量出水点为辅的方法,优化出预留防水岩柱和人工混凝土岩帽的解析计算及参数确定,实践中能有效控制围岩突水,并取得较好的技术经济效果。 相似文献
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李国富 《矿山压力与顶板管理》2005,22(1):109-111,114
实践表明,当巷道通过有水力联系的松软破碎带、断层裂隙带或直接揭露含水层时,常造成掘进中或掘进滞后突水,影响矿井生产安全。通过巷道导水及突水机理分析研究,提出井巷预注浆强化围岩防突水为主和掘后封堵小量出水点为辅的方法,优化出预留防水岩柱和人工混凝土岩帽的解析计算及参数确定,实践中能有效控制围岩突水,并取得较好的技术经济效果。 相似文献
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为了确保龙王沟煤矿回风大巷安全通过导通承压水的断层,阻隔底板奥灰水与巷道间的导水通道,有效提高断层破碎带的岩石强度,避免断层滞后突水和发生冒顶事故,采用对奥灰纪灰岩顶界面以下10~30 m范围内的岩层注浆和对断层破碎带巷道围岩帷幕注浆的方法,对巷道过断层治理技术进行了研究。回风大巷通过该断层后,该段巷道顶板只有少量淋水,总淋水量仅为0.5 m3/h。结果表明:通过对该断层的注浆治理,有效地封堵了奥灰水的导水通道,提高了巷道的围岩强度,治理方案能够满足巷道安全掘进的需要。 相似文献
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为了预防矿井巷道掘进前方构造导通承压水而造成突水事故,在朔州国强煤矿采用瞬变电磁法“五横一纵”探测试验方案超前探测突水构造,分析剖面图、平面图及立体图,精确圈定导水通道及富水区位置,确定水害类型及关联性,在此基础上进行超前钻探探放水设计,提出岩溶承压突水构造超前探放措施。结果表明:矿井瞬变电磁法可以实现巷道掘进前方富水构造全方位覆盖探测,根据全方位数据形成三维立体图,以此分析富水区分布及联通情况,推断国强煤矿掘进迎头前方可能存在断层或陷落柱等地质构造,且与砂岩、灰岩等含水层联通形成岩溶承压构造富水区|针对高承压岩溶区水压大、水量足的特点,钻探探放水设计采取 “15横9纵”的加密钻孔布置方式,在孔口安装止水套管、闸阀、水压表、水门、三通、泄水短管及防喷逆止阀等安全装置,才能进行安全探放水工作,并及时进行安全分析,采取相应的安全措施,保证工作面的安全采掘。 相似文献
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煤矿深部巷道高水压和高地应力下掘进,水害和破碎围岩是面临的主要水文和工程地质问题,以淮北邹庄煤矿87采区系统大巷群穿推覆体高压灰岩含水层和F25断层为研究对象,提出利用地面定向多分支孔顺巷探查和分段高压注浆技术,对巷道群穿含水层和断层破碎带进行超前区域治理。查明了太原组灰岩和断层破碎带的空间位置和形态。通过分段高压注浆在巷道周边形成了隔水圈带,含水层有效改造范围大于30m,改造后验证钻孔出水率降低约50%,单孔最大涌水量小于2m3/h。高压劈裂注浆固结了断层破碎岩体,巷道在断层带掘进未发生片帮、掉顶,采用锚喷支护即顺利穿过。地面定向多分支孔注浆技术是解决深埋巷道掘进面临的破碎围岩和水害问题的有效手段,实现了由井下治理到地面治理,边掘边治到掘前治理,逐段治理到区域治理的治灾理念转变,可广泛应用在巷道穿深大断裂或高承压含水层的超前治理。 相似文献
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针对九里山马坊泉大断层上下盘岩层极为破碎、裂隙极为发育,二水平3条暗斜井在开拓中存在极大突水风险的现状,结合矿井实际情况,通过井下探测钻孔确定断层准确位置,并在此基础上,先在井下使用高水双液速凝堵水材料加固断层破碎带、切断断层导水通道、封堵突水点,然后在地面使用水泥黏土材料大范围注浆,截断冲积层含水层涌水通道及深部L2、O_2灰岩含水层向上的补给通道。结果表明:巷道涌水量降低至0.7 m~3/min,有效的降低了巷道涌水量;含水层水压由2.8 MPa降至1.2 MPa以下,水位下降40 m左右。实现了九里山矿井巷工程穿过大断裂构造过程中"零突水、零淹面、零影响"的水害治理目标。 相似文献
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本文针对屯兰矿南翼8#煤胶带巷过断层破碎带防治水的工程,对巷道过断层破碎带的巷道掘进与防治水实际出发,运用现场观测、实地调研的方法分析了土地沟断层的水文地质情况,提出了"超前预注浆+‘U’型钢拱架+二次注浆"的巷道过断层破碎带综合防治水措施,并应用于屯兰矿南翼8#煤胶带巷的具体实践中,实践证明该方法有效控制了巷道涌水量,防止了巷道突水事故的发生,保证了该矿的安全高效生产。 相似文献
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Yanchun Xu Ermeng Zhang Yaqi Luo Lin Zhao Kang Yi 《Mine Water and the Environment》2020,39(2):320-330
Floor heave and water inrush accidents are likely in fault-traversing roadways above highly confined aquifers. In this paper, the deflection curve equation for the key floor stratum of a fault-traversing roadway in the Zhaogu no. 2 coal mine was derived based on the cantilever beam model, and the line strain in the failure zone, ε, was introduced to characterize the relationship between floor heave and deformation of deep intact rock layers. Then, three- dimensional pre-grouting technology was established for floor reinforcement. Analysis indicated that the rock surrounding the fault-traversing roadway was highly fractured, increasing the risk of water hazards. Numerical UDEC simulations showed that the plastic zone of the roadway was greater due to the faults; the floor heave, in this case, was 2.6 times greater than without faults. However, water pressure applied to the floor had a limited impact on deformation of the surrounding rock. The measured maximum deflection of the stratum was 644 mm, and the line strain ε in the failure zone in the floor was 67 mm, which resulted in a difference of 3.5% compared with the modelled results. The apparent resistivity in the grouted areas, observed through comprehensive geophysical explorations, was increased, suggesting that the grouting reinforcement had been successful. 相似文献
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About 75% water-inrush accidents in China are caused by geological structure such as faults, therefore, it is necessary to investigate the water-inrush mechanism of faults to provide references for the mining activity above confined water. In this paper, based on the fluid-solid coupling theory, we built the stress-seepage coupling model for rock, then we combined with an example of water-inrush caused by fault, studied the water-inrush mechanism by using the numerical software COMSOL Mutiphysics, analyzed the change rule of shear stress, vertical stress, plastic area and water pressure for stope with a fault, and estimated the water-inrush risk at the different distances between working faces and the fault. The numerical simulation results indicate that: (1) the water-inrush risk will grow as the decrease of the distance between working face and the fault; (2) the failure mode of the rock in floor with fault is shear failure; (3) the rock between water-containing fault and working face failure is the reason for water-inrush. 相似文献
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针对地下矿突水因素的不确定性与时空的随机性,主要应用改进D-S算法开展地下矿突水隐患识别与风险预测,以期为地下矿突水隐患识别和水灾预测与防治等提供有效的理论依据。在考虑地质突水因素的同时,更加注重在生产管理中的人为因素。通过采用专家打分法获取各突水因素的基本概率赋值(BPA),基于改进D-S算法,构建识别框架Ω={突水、临界、不突水、不确定},建立以富水性系数、隔水层系数、水压系数、构造系数、矿压系数、勘探系数、开采系数、预防管理系数为证据体的突水融合决策模型。最后,通过国内某典型矿山进行实际应用,结果与实际情况基本一致,说明所建立的预测模型是可行的。 相似文献