【作者】 马守龙；

【导师】 庞建勇；

【作者基本信息】 安徽理工大学 ， 岩土工程， 2008， 硕士

【摘要】 随着矿井开采规模的加强和开采深度不断增加,高应力软岩巷道的支护问题显得越来越突出,能否解决好高应力软岩巷道的支护难问题,是煤炭开采向纵深发展和安全生产的关键问题之一。目前高应力软岩巷道大多采用锚喷支护、锚网喷支护及可缩金属支架,由于金属支架与常规的锚喷支护技术不能适用高应力软岩巷道大变形的要求,支护结构破坏之后常常需要进行巷道的重新翻修,因而浪费大量的人力和物力。因此针对高应力软岩巷道支护特点,研究一种技术上合理、经济上可行的支护结构,具有较高的研究价值和现实意义。论文根据大跨度空间壳体力学原理,研究网壳锚喷支护技术。网壳锚喷支护实质上仍是锚网喷支护,其技术特色是用一种在地面加工成型的特殊三维钢筋支架代替普通的二维钢筋网,大幅度提高了锚网喷结构的支撑能力,不需要使用型钢支架、锚索、围岩注浆等手段进行加固就能有效地支护高地压大变形巷道、跨采动压巷道、冲击地压巷道以及大断面硐室等。其支护工程量与普通锚网喷支护相同,支护费用略高于普通锚网喷支护,但比锚网喷加其它支护手段的联合支护方式可大幅度降低。然而实际王程中发现,由于受围岩条件、地压分布、施工工艺等复杂因素的影响,随着网壳混凝土喷层受拉区增大,容易造成局部混凝土开裂甚至脱落,严重影响了衬砌支护整体的稳定性。因此,在网壳锚喷的基础上进一步开发聚丙烯混凝土喷层,对提高混凝土喷层的韧性、抗拉和抗剪强度,改善叼壳整体支护效果,具有重要的研究价值。论文在网壳锚喷支护的基础上,研究聚丙烯纤维混凝土钢筋网壳复合衬砌新结构,对围岩—支护相互作用理论及高应力软岩巷道支护理论进行了系统的研究。论文研究了聚丙烯纤维混凝土钢筋网壳复合衬砌结构的力学特性,对复合衬砌结构进行内力分析和计算。利用开口圆柱壳的一般力学原理和方法,推导出壳体的内力、位移和应力求解格式。依托西山煤电集团杜尔坪煤矿南翼大巷12002破碎段修复工程,完成了聚丙烯纤维混凝土喷层的室内力学性能试验和单片聚丙烯纤维混凝土钢筋网壳复合衬砌支护结构的室内模型试验,研究了复合衬砌支护系统的变形、破坏形态与发展规律。根据模型试验和理论分析建立有限元数值计算模型,利用ANSYS有限元程序完成整架聚丙烯纤维混凝土钢筋网壳复合衬砌结构的数值计算,对新型聚丙烯纤维混凝土钢筋网壳复合衬砌结构的内力分析起到补充校核作用,完成支护方案的优化设计。结合典型高应力软岩巷道工程,制订施工技术要求与施工工艺。通过现场监测,与其它常用高应力软岩支护方式相比较,完成了新型聚丙烯纤维混凝土钢筋网壳复合衬砌支护典型巷道的技术、经济对比和社会效益评价。更多还原

【Abstract】 With the mine scale enhance and the mine toward deep level, the problem of the timbering and the maintenance of high stressed soft rock drift is becoming more aculeate. It is the key of the mine toward deep leve and the safety mine. Whether can we solve the problem of high stressed soft rock drift supporting. In theory and in practice, high stressed soft rock supporting is compound form on the whole, however, those common supporting measures can’t meet the demand of large deformation in high stress soft-rock drift. It sometimes cost large or can’t reach expect purpose. It is no doubt worth studying that how to make good use of support system in high stressed soft rock drifts, in that this support system is advanced and economical.The bar shell bolting shotcrete and support system was studied on the basis of the analysis for the mechanics principle of shell structures. The bar shell bolting shotcrete and support system was a new kind of bolting and shotcrete supporting forms. The technique feature is a kind of specially three-dimensional bar-mat reinforcement. It has very high mechanical property and was applied in difficult drift. But its cost is cheap. It was applied in drift by many kinds of factors and its concrete sprayer layer was easily destructed. So, the new polypropylene fiber concrete sprayer layer was studied on the basis of the bar shell bolting shotcrete and support system has very high value. Because toughness of the polypropylene fiber concrete sprayer layer are higher than those of general one.The new polypropylene fiber concrete bar shell bolting shotcrete and support system was studied on the basis of the bar shell bolting and shotcrete support. The paper discussed wall rock-support theory and method of high stressed soft rock drift. The structure’s internal force was analyzed and calculated and the formulas of internal force, displacement, stress was deduced according to the general mechanics theory of the ringent cylindrical shell. The model experiment was done by relying on the industrial test on 120m length broken laneway of south flange of Du Erping mine of Xi Shan power and coal group and the distortion, destruct shape, developmental rule of the supporting system was examined while the stress and strain distributing rule and also the ultimate load were obtained. The calculative model of finite element numerical simulation with computer was established on base of combing the theory analysis with the experimental result. As the result of the numerical calculation the study on the structure was supplementary verified finally. The otherness was making for the optimizing of the design project. At last, the conclusion of numerical calculations proved that ANSYS program is reasonable and creditable. With combination by typical engineering, the construct technical request and the technology were established. It was compared to other supporting method that used commonly in high stressed soft rock drift by locale watching and testing, the technique, economic contrast of the typical drift with the new polypropylene fiber concrete bar shell bolting shotcrete and support system was completed and the social benefit was evaluated.更多还原