三软综放沿空锚网索支护巷道回采期间围岩变形特征

针对三软综放沿空巷道围岩大变形、难支护的特点,提出采用锚网索支护新技术,通过对试验巷道数值模拟以及表面位移、围岩深部位移和围岩应力的现场监测,分析了试验巷道矿压显现活动规律,掌握了试验巷道在锚网索支护下的围岩变形规律,这为锚网索支护在三软煤层巷道的推广应用和支护参数设计提供了科学依据.     

三软煤层巷道支护方式及围岩控制效果分析

在分析三软煤层极不稳定煤巷矿压特点基础上，研制了适应两帮大变形的可缩性工字钢支架、适应两帮及顶底严重变形特别是底鼓的U29可缩性环形支架，设计了锚架注联合支护的参数与工艺，并在同一采区先后进行了工业性试验．采用数值模拟方法研究了三软条件下锚梁网索支护不同参数选取、不同布置形式对围岩变形的控制效果，优选了支护参数并进行了现场试验，比较试验结果，表明极不稳定煤巷围岩变形主要特点是强烈和持久的两帮移近及底鼓，锚梁网索支护是控制围岩大变形的有效方法，其技术关键是提高锚杆初锚力、布置底角锚杆及顶角锚索．     

煤巷锚网索支护矿压显现规律数值模拟研究

本文结合观台矿实际情况,采用数值模拟方法对煤巷锚网索支护进行分析研究,得出了不同支护参数条件下巷道围岩变形规律,以及高水平应力是导致巷道加剧变形直至破坏的主要原因,既验证了支护参数合理性,又对支护效果进行预测,为优化支护参数提供理论依据.     

古汉山煤矿巷锚网支护实践

介绍了古汉山煤矿１１０６工作面上、下顺槽的锚网支护技术以及在锚网支护实践中存在的问题和解决问题的技术对策。通过对锚网煤巷的变形观测和经济效益分析与社会效益分析,表明煤巷锚网支护较传统的架工字钢棚支护更合理、更经济、更具有可行性,为古汉山煤矿煤巷支护开辟了条新途径。     

深部回采巷道支护参数的正交数值模拟

平顶山矿区深部主采煤层回采巷道矿压显现强烈,普通锚网支护难以适应深部开采的要求,高强度、高刚度、高预紧力的强力支护是控制深部围岩变形的有效途径.采用正交数值方法对平顶山矿区主采煤层回采巷道的支护参数进行了模拟分析,确定了影响围岩变形主次因素.应用多元回归分析法,拟合了巷道断面收敛系数与综合岩体强度、顶板锚索根数、锚杆预紧力、垂直应力和动载系数的关系式,对平煤股份十一矿高强锚网索支护的丁5-6-26071风巷断面收敛变形进行了预测,与现场矿压测试结果基本吻合.     

古汉山煤矿煤巷锚网支护实践

介绍了古汉山煤矿 1 1 0 6工作面上、下顺槽的锚网支护技术以及在锚网支护实践中存在的问题和解决问题的技术对策 .通过对锚网煤巷的变形观测和经济效益分析与社会效益分析 ,表明煤巷锚网支护较传统的架工字钢棚支护更合理、更经济、更具可行性 ,为古汉山煤矿煤巷支护开辟了一条新途径 .     

古汉山煤矿煤巷锚网支护实践

介绍了古汉山煤矿1106工作面上、下顺槽的锚网支护技术以及在锚网支护实践中存在的问题和解决问题的技术对策.通过对锚网煤巷的变形观测和经济效益分析与社会效益分析,表明煤巷锚网支护较传统的架工字钢棚支护更合理、更经济、更具可行性,为古汉山煤矿煤巷支护开辟了一条新途径.     

大跨度切巷锚网索联合支护技术的应用研究

根据黄沙矿2147采煤工作面地质条件,通过理论计算,设计2147采煤工作面切巷的锚网索支护参数,并提出具体的施工工艺,为切巷施工提供了技术依据.切巷的支护效果观测表明,切巷的表面位移量、顶板离层量及锚杆锚固力均控制在切巷围岩变形允许的范围内,切巷锚网索支护效果较好,满足了切巷的服务要求.     

锚网喷联合支护在软岩巷道中的应用

根据围岩特性,采用工程类比法,对软岩顶板的支护方式和材料进行了优化选择,利用锚网喷联合支护技术既经济高效,又满足了防火等方面的安全要求.     

锚网喷联合支护在软岩巷道中的应用

根据围岩特性,采用工程类比法,对软岩顶板的支护方式和材料进行了优化选择,利用锚网喷联合支护技术既经济高效,又满足了防火等方面的安全要求.     

Deformation mechanism of roadways in deep soft rock at Hegang Xing’an Coal Mine

Engineering geomechanics characteristics of roadways in deep soft rock at Hegang Xing’an Coal Mine were studied and the nature of clay minerals of roadway surrounding rock was analyzed. This paper is to solve the technical problems of high stress and the difficulty in supporting the coal mine, and provide a rule for the support design. Results show that mechanical deformation mechanisms of deep soft rock roadway at Xing’an Coal Mine is of I_ABII_ABCIII_ABCD type, consisting of molecular water absorption (the I_AB-type), the tectonic stress type + gravity deformation type + hydraulic type (the II_ABC-type), and the III_ABCD-type with fault, weak intercalation and bedding formation. According to the compound mechanical deformation mechanisms, the corresponding mechanical control measures and conversion technologies were proposed, and these technologies have been successfully applied in roadway supporting practice in deep soft rock at Xing’an Coal Mine with good effect. Xing’an Coal Mine has the deepest burial depth in China, with its overburden ranging from Mesozoic Jurassic coal-forming to now. The results of the research can be used as guidance in the design of roadway support in soft rock.     

A study of support strategies in deep soft rock: The horsehead crossing roadway in Daqiang Coal Mine

Geomechanics in deep mines becomes more complex and structural support in soft rock can be very difficult. Highly stressed soft rock subject to expansion deformation is particularly difficult to control. The Tiefa Coal Industry Group Daqiang Coal Mine is used as an example. A ventilation shaft, ?550 horsehead, is located in tertiary soft rock. Analysis of the reasons for deformation shows an intumescent rock, which is easily damaged. Field observations and theoretical analysis led to a design capable of stabilizing the rock. A combination of spray, anchors, anchor bolts, and soft corner coupled truss supports allowed the deformation to be controlled. This provides a model for similar designs when support of a horsehead roadway is required.     

Numerical simulation of creep characteristics of soft roadway with bolt-grouting support

Based on the engineering background of a soft rock roadway in Qinan Coal Mine 82 Area,Huaibei Mining Group,three creep models with different support patterns in soft rock roadway were established by using geotechnical software of FLAC2D.According to the calculation results of different models,the change law of mechanical properties with the time of bolt-grouting support structure was obtained.Furthermore,for the test bolt-grouting support roadway,the deformation law of surrounding rock got by underground industrial experiment and field observation accords with the creep law got by numerical calculation.The results of numerical calculation and field observation show that,compared with other supports,the creep of bolt-grouting support roadway enters the steady-state creep stage from tertiary creep stage ahead,the deformations of roof,floor and two sides are decreased greatly,the plastically deforming area in surrounding rock is reduced obviously,and the distribution ranges of maximum and minimum principal stress are shrank obviously.All those fully show that the bolt-grouting support has its remarkable advantages in controlling surrounding rock creep and improving the whole strength of surrounding rock and self-bearing capacity.     

煤矿矸石井下处理的研究

针对煤矿矸石地表堆积对人类生存环境和条件带来的威胁与危害，研究了矸石井下处理技术．该项技术运用开采沉陷理论预计地表允许沉陷范围内充填区域矸石充填压实后残余空间的最大高度，确定矸石充填巷的布置；基于数值模拟方法分析了充填巷两侧煤柱应力分布、消除充填巷开掘时的“多洞效应”问题，优化矸石充填巷掘进顺序；设计了矸石充填工艺．此项技术在邢东矿井得到成功应用，实现了矸石井下处理与建筑物下煤炭资源的开采利用．     

古汉山矿东大巷“钢棚+注浆”支护工程实践

针对焦作矿区古汉山矿东大巷围岩属高应力、节理化、强膨胀的极软岩特性,采用一次拱形钢棚支护、二次锚注支护的"钢棚+注浆"支护技术方法,有效控制了巷道的强烈变形,避免了巷道维修,取得了软岩支护的最佳效益.     

软岩巷道围岩损伤破坏范围的地震探测研究

针对软岩巷道难支护的主要原因是对巷道工程地质条件和围岩结构认识不清、支护对象不明确的问题,论述 了应用地震技术探测软岩巷道损伤破坏范围的可行性,以显德汪矿主运输大巷为试验研究对象,利用地震技术对巷道进行了全断面探测,实现了软弱结构面的空间定位和围岩结构的精确探测,从而为支护形式和参数的选择提供了直观可靠的地质依据。     

Stability control of gate groups in deep wells

In order to study stability control methods for a deep gate group under complex stresses, we conducted field investiga-tions and analyses of reasons for damage in the Xuzhou mining district. Three reasons are proposed: deep high stress, improper roadway layout and support technology. The stability control countermeasures of the gate group consist of an intensive design technology and responding bolt-mesh-anchor truss support technology. Our research method has been applied at the -1000 m level gate group in Qishan Coal Mine. Suitable countermeasures have been tested by field monitoring.     

平顶山煤业(集团)公司一矿地应力测量及分析

介绍了KX - 81型空心包体应变计的测量原理、测量方法 ,并利用其对平顶山煤业(集团 )公司一矿地应力进行了测量 ,根据实测的结果 ,分析了矿区地应力场分布特征及其与地质构造的关系 .这些分布特征对矿井深部的巷道支护以及对研究煤与瓦斯突出有着重要的指导意义     

Floor heave in the west wing track haulage roadway of the Tingnan Coal Mine: Mechanism and control

Floor heave of a roadway is a dynamic phenomenon that often happens in the roadways of coal mines. It seriously affects safe production in the coal mine. Floor heave has long been one of the most difficult problems to be resolved during coal mining. An analysis of floor heave in the soft rock surrounding the roadway, and the factors influencing it, allowed the deformation mechanism in the west wing double track haulage roadway of the Tingnan Coal Mine to be deduced. Three types of floor heave are observed there: intumescent floor heave, extrusion and mobility floor heave, and compound floor heave. Control measures are proposed that have been adopted during a recent repair engineering project. Control of the floor heave in the west wing track haulage roadway was demonstrated. The reliability and rationality of a combined support technology including floor anchors, an inverted arch, and anchoring of both sides was verified by mine pressure data and the field observations. Waterproofing measures were also undertaken to assist in the control of floor heave.     

松软巷道注浆加固堵水技术的应用

中马村煤矿因巷道支护形式等与动水条件下的巷道压力不匹配而使巷道破坏造成大面积突水 .通过对巷道破坏及突水机理分析 ,确定在巷道突水地区采用浅部围岩注浆提高围岩强度和深孔高压注浆封水相结合的注浆方式 ,能有效控制围岩变形破坏 ,实现堵水目的 .