深部巷道“双壳”支护力学模型及机理研究
发布时间：2018-07-14 17:16
【摘要】：我国生产矿井逐渐进入深部开采时代,深井工程软岩巷道变形量大、破坏严重、流变持续时间长的问题极大制约了矿业开采的进一步发展,致使生产成本增加。为解决深井巷道支护难的问题,本文搜集并叙述了国内外对深井软岩巷道支护的研究进展,介绍了一种新的支护理论。通过调查深井巷道围岩的破坏特征和原因,基于强化围岩支护体自身结构的理念,结合了工程实践中“浅部低压注浆、深部高压注浆”的二次注浆+锚杆+锚索支护的研究,提出了深井巷道“双壳”注浆加固支护理论。建立了“单壳”、“连续双壳”、“非连续双壳”三类模型,并根据岩体强度破坏准则及弹塑性力学理论,构建了“双壳”物理力学模型,理论推导了“双壳”支护体的应力分布、位移及分区半径的计算公式,并采用D-P准则考虑中间主应力和岩石脆性损伤理论本构关系对巷道围岩的弹塑性分析进行了优化,使物理模型更符合实际情况。本文主要采用数值模拟软件进行研究分析。首先模拟了裸巷在不同埋深,不同围岩强度条件下巷道围岩的应力分布特征、移动变形规律,总结了巷道各部分围岩变形失稳原因以及支护要点,为研究“双壳”支护机理奠定基础。然后通过模拟对比裸巷、“单壳”结构、连续“双壳”结构、非连续“双壳”结构的围岩应力分布及变形规律,研究深井软岩巷道“双壳”支护机理。深入分析“双壳”的支护机理:认为巷道受高压作用使应力随塑性区的扩大由浅部向深部转移,而锚杆+浅部注浆形成支护壳,改善了浅部破碎围岩结构,保证了围岩完整性;锚索+深部高压注浆形成加固壳,改善了深部围岩力学特性,缓解了深部围岩塑性蠕变,阻隔了高地应力向浅部传递,并为锚杆锚索提供着力基础;非连续双壳中部柔性层裂隙发育,其应变空间可协调浅、深部壳体协同变形,吸收岩体变形能,阻隔深部高应力传递;研究成果形成了理论和技术体系,具有理论和指导工程实践双重价值,丰富了深部巷道支护理论,促进了深部巷道支护技术的发展。
[Abstract]:The production mine in our country has gradually entered the deep mining age. The problems of large deformation, serious damage and long rheological duration of soft rock roadway in deep well engineering have greatly restricted the further development of mining, resulting in the increase of production cost. In order to solve the difficult problem of deep roadway support, this paper collects and describes the research progress of soft rock roadway support at home and abroad, and introduces a new supporting theory. By investigating the failure characteristics and reasons of surrounding rock in deep roadway, based on the concept of strengthening the structure of surrounding rock supporting body, combining the research of secondary grouting anchor cable support of "shallow low pressure grouting, deep high pressure grouting" in engineering practice, In this paper, the theory of double-shell grouting and supporting for deep roadway is put forward. Three kinds of models of "single shell", "continuous double shell" and "discontinuous double shell" are established. According to the failure criterion of rock mass strength and the theory of elastoplastic mechanics, the physical and mechanical model of "double shell" is constructed. The formulas of stress distribution, displacement and zoning radius of "double shell" supporting body are derived theoretically, and the elastoplastic analysis of roadway surrounding rock is optimized by using D-P criterion to consider the constitutive relation of intermediate principal stress and brittle damage theory of rock. In this paper, numerical simulation software is used to study and analyze. At first, the stress distribution characteristics and moving deformation law of roadway surrounding rock under different buried depth and different surrounding rock strength are simulated, and the reasons of surrounding rock deformation instability and the key points of supporting are summarized. It lays a foundation for studying the mechanism of double shell support. Then the stress distribution and deformation of surrounding rock of bare roadway, "single shell" structure, continuous "double shell" structure and discontinuous "double shell" structure are simulated and compared, and the supporting mechanism of "double shell" in soft rock roadway of deep well is studied. Deeply analyzing the supporting mechanism of "double shell": it is considered that the stress of roadway is transferred from shallow to deep with the expansion of plastic zone under the action of high pressure, while the shallow grouting of anchor rod forms supporting shell, which improves the structure of shallow-wall rock and ensures the integrity of surrounding rock. The reinforced shell formed by high pressure grouting in the deep part of the anchor cable improves the mechanical properties of the deep surrounding rock, alleviates the plastic creep of the deep surrounding rock, prevents the transfer of high ground stress to the shallow part, and provides a strong foundation for the anchor cable. The fracture of flexible layer in the middle of discontinuous double shell is developed, its strain space can be coordinated shallowly, the deep shell can coordinate deformation, absorb the deformation energy of rock mass, block the transfer of high stress in the deep, and the research results form a theoretical and technical system. It has the dual value of theory and engineering practice, enriches the theory of deep roadway support, and promotes the development of deep roadway supporting technology.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353
本文编号：2122348
[Abstract]:The production mine in our country has gradually entered the deep mining age. The problems of large deformation, serious damage and long rheological duration of soft rock roadway in deep well engineering have greatly restricted the further development of mining, resulting in the increase of production cost. In order to solve the difficult problem of deep roadway support, this paper collects and describes the research progress of soft rock roadway support at home and abroad, and introduces a new supporting theory. By investigating the failure characteristics and reasons of surrounding rock in deep roadway, based on the concept of strengthening the structure of surrounding rock supporting body, combining the research of secondary grouting anchor cable support of "shallow low pressure grouting, deep high pressure grouting" in engineering practice, In this paper, the theory of double-shell grouting and supporting for deep roadway is put forward. Three kinds of models of "single shell", "continuous double shell" and "discontinuous double shell" are established. According to the failure criterion of rock mass strength and the theory of elastoplastic mechanics, the physical and mechanical model of "double shell" is constructed. The formulas of stress distribution, displacement and zoning radius of "double shell" supporting body are derived theoretically, and the elastoplastic analysis of roadway surrounding rock is optimized by using D-P criterion to consider the constitutive relation of intermediate principal stress and brittle damage theory of rock. In this paper, numerical simulation software is used to study and analyze. At first, the stress distribution characteristics and moving deformation law of roadway surrounding rock under different buried depth and different surrounding rock strength are simulated, and the reasons of surrounding rock deformation instability and the key points of supporting are summarized. It lays a foundation for studying the mechanism of double shell support. Then the stress distribution and deformation of surrounding rock of bare roadway, "single shell" structure, continuous "double shell" structure and discontinuous "double shell" structure are simulated and compared, and the supporting mechanism of "double shell" in soft rock roadway of deep well is studied. Deeply analyzing the supporting mechanism of "double shell": it is considered that the stress of roadway is transferred from shallow to deep with the expansion of plastic zone under the action of high pressure, while the shallow grouting of anchor rod forms supporting shell, which improves the structure of shallow-wall rock and ensures the integrity of surrounding rock. The reinforced shell formed by high pressure grouting in the deep part of the anchor cable improves the mechanical properties of the deep surrounding rock, alleviates the plastic creep of the deep surrounding rock, prevents the transfer of high ground stress to the shallow part, and provides a strong foundation for the anchor cable. The fracture of flexible layer in the middle of discontinuous double shell is developed, its strain space can be coordinated shallowly, the deep shell can coordinate deformation, absorb the deformation energy of rock mass, block the transfer of high stress in the deep, and the research results form a theoretical and technical system. It has the dual value of theory and engineering practice, enriches the theory of deep roadway support, and promotes the development of deep roadway supporting technology.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353
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