共查询到20条相似文献,搜索用时 62 毫秒
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针对液压支架推移机构在工作中的受力状况以及连接件的过载保护问题进行研究,采用剪切应力安全销轴避免推移机构过载冲击带来的部件损坏现象并构建数字化模型,并对模型参数进行设计和分析,从机械和液压2个方面重点解决在拉架瞬间启动以及冲击载荷对系统主零件的破坏问题。 相似文献
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由于液压支架的推移装置在井下综采工作面复杂多变的受力情况,其损坏比较严重,其受力状况和工作性能对液压支架的正常运行影响较大。通过分析6.2 m液压支架推移装置在井下综采工作面生产过程中的受力状况,为液压支架推移装置后续的设计、改进和维修奠定一定的理论基础。 相似文献
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王勇 《采矿与安全工程学报》1999,(2)
本文通过分析原有四连杆液压支架的力学计算模型,证明这种支架在前、后连杆平行时受力的连续性,并建立一种连续的力学模型,这种模型适用于所有四连杆式液压支架在各种情况下的力学分析 相似文献
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液压支架四连杆机构受力分析 总被引:2,自引:1,他引:1
王勇 《矿山压力与顶板管理》1999,(2):84-86
本文通过分析原有四连杆液压支架的力学计算模型,证明这种支架在前、后连杆平行时受力的连续性,并建立一种连续的力学模型,这种模型适用于所有四连杆式液压支架在各种情况下的力学分析。 相似文献
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介绍了高位放顶煤液压支架的架型种类、主要优缺点、支架的稳定性分析、主要部件的作用及结构形式、支架的简化力学模型、支架运动学分析及部分部件受力分析与计算。 相似文献
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高地应力软岩巷道变形机理与对策 总被引:1,自引:0,他引:1
通过对四川白皎矿构造应力分析,围岩力学性质和矿物成分测定,以及巷道变形破坏特征的调查,确定了软岩巷道属于高构造应力膨胀型复合软岩,揭示了巷道变形破坏特征和机理,提出了相应的支护对策,为此类软岩巷道的支护设计提供了依据。 相似文献
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梁诚成 《采矿与安全工程学报》2002,19(4):42-45
文中分析了瓦斯尾巷的变形破坏方式 ,并对其破坏机理进行了分析。针对尾巷的变形破坏特点 ,提出了“控顶要护帮”的支护观点。复合顶板瓦斯尾巷采用高强度锚杆支护技术 ,有效地控制了巷道围岩变形 ,保证了巷道稳定性。实践证明 ,该支护方式适应动压影响 ,已成为一种切实可行的支护技术。 相似文献
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The truss cable support technology was put forward to control the large mining height and composite mudstone strata roadway. This technique makes the steady rock in roadway slantwise top be anchor points, makes the truss cable be steady support structure through special implement, and supplied rock in anchor area with horizontal and vertical pressure which strengthens the surrounding rock's anti-strain capability, so it can solve the support problem in roadway with the large cross section and large mining height with mudstone strata. The support mechanism of truss cable about how to make the soft strata stabilize is analyzed by use of the mechanical method. Based on the mechanism and numerical simulation method, the truss cable support project was designed and used to the large mining setting room in eleventh mining area of Bailong Mine successfully. 相似文献
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深井高应力马头门支护破坏机理及防治 总被引:1,自引:0,他引:1
针对潘一东煤矿深部高应力作用下副井马头门维护困难的问题,进行了马头门破坏机理分析,并提出了防治对策.现场应用结果表明,利用注浆、锚索网等多种方式进行支护,提高马头门、井筒及巷道相接处的围岩强度,使马头门的变形破坏得到了明显遏制.后期的应力变形监测显示,各项治理措施取得了良好的效果. 相似文献
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矿震的发生与地球固体潮汐活动存在一定相关性,为进一步探明固体潮汐应力对矿震的触发作用,本文以国内典型冲击灾害频发的华亭煤田矿区为研究背景,采用Schuster检验方法对发生在顶板中的矿震进行了固体潮日潮变化的统计分析。结果显示:1)固体潮汐应力对矿震的发生存在显著触发作用,矿震发生的频次与潮汐应力垂直、东西、南北和水平剪应力分量的相位角之间都有显著的相关性,Schuster检验P值均小于触发阈值0.05;2)潮汐应力对不同级别矿震触发作用存在差异,随着震级的增大,矿震的发生由重力控制转为构造应力控制;3)对不同类型矿震的触发力学作用不同,对于重力控制的中小型矿震,潮汐应力垂直分量最大(受压)、水平分量最小(受拉)时矿震较易发生,而构造应力控制的大级别矿震则与之相反;4)矿震活动也会造成相关区域地层中的钻孔应变时序形态产生畸变。 相似文献
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The deformation and failure mechanical mechanism in soft rock roadway is related to the stability of supported tunnels, which is important to coal mine production and construction. By physical mechanics experiments and X-ray diffraction (XRD) tests, the engineering mechanical properties of soft rock, as well as main mineral composition of the surrounding soft rock of Qigou Coal Mine, were obtained. Based on analysis results, a method using bolt-beam-net combination to support was put forward. Mechanical analysis of the support form was done by using the calculation software FLAC3D. Results show that clay minerals of this mine are kaolinite and illite mixed layer, of which the water absorption is relatively obvious and presented mudding characteristic after absorbing water, with the plasticity index of 0.35, with small expansibility, which is weakly consolidated colloid with strong connected force in unit cell. The rock blocks have the characteristics of moisture absorption softening, and the deformation mechanical mechanism of which is with the coexistence of molecular expansive mechanism, colloid expansive mechanism, and weak layer trend type. The calculation results show that the bolt-beam-net support structure makes the bolt, beam, and roof deform compatibly. The beams make the force in the bolt relatively homogeneous, which restricts the displacement of the tunnel roof as well. Finally, using in situ monitoring, the numerical results were verified. 相似文献
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