共查询到18条相似文献，搜索用时 312 毫秒
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锚索支护主要是将一定长度的低松弛高强度的钢绞线配以专用锚具,用树脂或砂浆进行锚固,通过液压千斤顶在其尾部施加预应力,达到对巷道锚固支护的一项技术。因锚索支护可以独立承担对巷道围岩的控制,该技术主要用于对常规支护的补强和围岩极为破碎的巷道支护,是矿压显现严重巷道的最有效支护方式,可以用于井下任何巷道和硐室,目前已成为青海海西州柴达木盆地海拔3200米的鱼卡公司煤矿7#煤层支护的主要技术手段。本文围绕柴达木盆地鱼卡公司煤矿的地质条件和回采工艺等应用背景,结合鱼卡公司10多年从事锚索支护技术的实际工作,就锚索支护在该采矿中应用进行了介绍和分析,并给出了成功的经验——应用锚索施工的整个工艺过程中存在的问题及其解决的关键技术。这对实际生产应用具有一定的指导意义和实用价值。 相似文献
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总结分析了隧道破碎围岩的力学特性,结合隧道开挖支护施工中容易出现的问题和工作经验,提出了破碎围岩条件下隧道开挖和支护方案的改进意见,以期对同类条件下隧道的施工有借鉴和帮助。 相似文献
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破碎围岩条件下隧道开挖支护方法改进方案探讨 总被引：3，自引：0，他引：3
总结分析了隧道破碎围岩的力学特性，结合隧道开挖支护施工中容易出现的问题和工作经验，提出了破碎围岩条件下隧道开挖和支护方案的改进意见，以期对同类条件下隧道的施工有借鉴和帮助。 相似文献
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黑龙江省黑河市金三角煤矿迫切需要查明该区断层和褶曲等地质构造的分布、发育情况,因而采用二维地震方法对其地质构造进行分析,为下步煤矿生产工作提供指导作用。 相似文献
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在办理临时用地许可之前是否需要办理临时建设用地规划许可存在着不同意见：一种认为不需要办理,另一种认为需要办理,还有一种认为区分不同情况分别予以办理;另外,临时建设用地规划许可已办理是否都要办理临时用地许可也存在着分歧。本文就这两个问题进行分析和探讨,以供参考。 相似文献
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The Muzhailing extra-long highway tunnel and corresponding inclined shafts in Lanzhou,Gansu Province,China passes through structurally complex carbonaceous slate that is under high ground stress.Rationally-designed and effective support is of high importance for achieving safe and efficient tunnel construction.The No.2 inclined shaft of Muzhailing Tunnel was taken as the engineering background prototype,for which,a similar model test was conducted to evaluate the effect of highly pretightened constant resistance(NPR,Negative Poisson’s Ratio)anchor cable support provision to the geologically complex carbonaceous slate at different depths.Two schemes were proposed during testing:one scheme was without support and the second was with asymmetric support from highly pre-tightened constant resistance anchor cable.Digital speckle displacement analysis system and micro-groundstress sensors were employed to measure the deformation and shear stress distribution of the tunnel.The results demonstrated that through the second support scheme,the deformation of the surrounding rock could be effectively ameliorated,while this support scheme was applied on the project site of the No.2 inclined shaft,to explore the rationality of the scheme through field engineering tests.On-site monitoring indicated that the deformation of the surrounding rock was within the reasonable design range and the problem of severe tunnel deformation was effectively controlled.The research methods and related conclusions can be used as a reference for the treatment of large deformation problems in deep-buried soft rock tunnels. 相似文献
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通过采用地面物探、钻探和井下巷探、钻探相结合的综合勘探方法,对鲁村井田深部进行了补充勘探,并对井田以往地质资料进行了重新对比分析,发现该井田-400～-1 300 m的埋深范围内不但存在以往认为已被剥蚀缺失的太原组上部地层,还保存了较完整的山西组,尤其是在该段地层中新发现了5个局部可采煤层,为井田增加了资源储量、延长了服务年限。填补了沂源煤田太原组上部和山西组含煤地层资料的空白。 相似文献
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透水事故是煤矿安全生产的主要隐患之一,不仅造成生命威胁,也会带来巨大的经济损失。菏泽茅庄煤矿主斜井穿越含水量十分丰富的流砂地层,亟待进行喷浆防渗加固。该文介绍了菏泽茅庄煤矿主斜井的高喷灌浆防渗加固的工程概况、旋喷桩施工设计、施工方法,以期为相关研究、生产工作提供一定的施工思路。 相似文献
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井工煤矿对生态系统的影响和破坏主要为采空区导致地表变形、地面塌陷、地裂缝等地质灾害,地下水系统破坏和"三废"排放等。该文认为人们对矿区生产及闭坑后地下水污染对农业的危害未能引起足够的重视,急需强行关闭用作灌溉的污染水井,然后需要进行监测、封堵、治污等工作,逐渐提高矿区地下水质量;认为煤矿高岩温岩体作为地热能的主要赋存体,具有较好的热导率,通过水源热泵系统提取循环水中的热量,可以将采空区周边的地温能加以提取利用,让煤矿在生产及闭坑后均能产生地热能源;认为制约煤矿采空塌陷积水区治理的关键问题是解决充填积水区和井下采空区填充物问题,提出改造鲁南运河,将黄河泥沙输送到济宁及周边矿区;认为治理历史遗留矸石山的关键问题是爆破削坡过程中发生崩塌、滑坡、扬尘等灾害,可以利用高压水枪,配合破岩机和挖掘机联合作业来解决。 相似文献
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??????????????????ú????????????????λ?????Σ?????????????????????Χ???λ?????ε???Ч???????????????????????????丽???????????μ?????????????????????н??з???????????????????????н??????????????????????????????????? 相似文献
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《山地科学学报》2021,(5)
Large squeezing deformation of layered soft rock tunnel under high geo-stress has a significant time-dependent deformation behavior. In this paper, we studied the deformation mechanism during the construction period of deep-buried softrock tunnel by means of a combination of field observations and a numerical method. First, a new classification criterion for large deformations based on the power exponent variation law between the deformation and the strength-stress ratio is proposed. Then, the initial damage tensor reflecting the bedding plane(joint) distribution and an equivalent damage evolution equation derived from the viscoplastic strain are introduced based on the geometric research method, i.e., a new rheological damage model(RDL model) of layered soft rock is established consisting of elastic, viscous, viscoelastic, viscoplastic and plastic elements. A field test was conducted on the Maoxian tunnel in Sichuan province, southwestern China, which is in broken phyllite(layered soft rock) under high geo-stress. The tunnel has experienced large deformation due to serious squeezing pressure, thus we adopted double primary support method to overcome the supporting structure failure problems. The rheological parameters of phyllite in the Maoxian tunnel were recognized by using SA-PSO optimization, and the RDL model does a good job in describing the time-dependent deformation behavior of a layered soft-rock tunnel under high geo-stress. Thus, the RDL model was used to investigate the supporting effect and bearing mechanism of the double primary support method. Compared with the single primary support method, the surrounding rock pressure, secondary lining force, surrounding rock deformation, and the depth of the damage to the rock mass was reduced by 40%-60% after the double primary support method was used. 相似文献
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采空区地表山体侧向变动,不同于一般天然山坡,也与采空区一般上覆岩层的变形破坏有异;它是二者复合机理的效应。本文在分析考察了毗邻电厂的横山顺倾构造山体、剖析了地下采空情况认为:山体侧向变动中,软弱夹层有决定性作用,变动范围、速率和规模与地下采空有关;并利用地质力学模型试验和数值模拟,探索了采动引起山体应力场及变动规律。结果表明,山体岩层的变形、位移、破坏、由直接顶板向地表发展,采空坍陷诱发了软弱夹层的蠕滑,则产生山体侧向滑移;电厂区地表隆起变形是山体侧向滑移挤压地基土的反映。通过现场实际调研、变形观测资料分析与数值模拟和模型试验的对比研究,提出了“坍落拱梁”的成生效应、挤压蠕滑效应、失稳效应;揭露了顺倾构造山体在采空影响下,具有地表、地下的“复合临空面”的“复合应力场”中“复合变动”的“复合机理”;并提出这种山体侧向变动机理的典型地质模式,借以论证山体稳定性。 相似文献