岩溶隧道侧部岩盘突水机制研究

发布时间：2018-04-19 01:20

本文选题：隧道工程 + 力学机制　；参考：《公路交通科技》2017年05期

【摘要】：我国岩溶地区广泛分布,隧道建设穿越岩溶区域极易发生突水突泥灾害。为防止灾害的发生,采用隔水关键层原理对断层段岩盘突水力学机制进行了理论分析研究。就岩溶隧道断层段岩盘力学破坏机制探讨建立了溶腔位于隧道侧面条件下断层突水力学模型,推导了岩溶隧道断层段岩盘最小安全厚度计算公式,并结合工程实例对岩盘最小安全厚度的确定进行了讨论。对于压性断层,最小安全厚度计算依据以水压0.8 MPa为分界,小于0.8 MPa时应按抗弯强度分析,反之则应按抗剪强度分析,同时不能忽略零水压情况;对于张性断层,最小安全厚度计算需考虑侧方岩体上下部长度,较长部分更易被破坏,等长时下部易被破坏。确定岩盘最小安全厚度,综合考虑岩盘力学性质、溶腔水压及隧道半径等因素,对侧部岩溶隧道断层段设计施工提供了具体参考。
[Abstract]:Because of the widespread distribution of karst areas in China, tunnel construction is prone to water inrush and mud inrush through karst areas.In order to prevent the occurrence of the disaster, the hydraulic mechanism of rock disk inrush in fault section is analyzed and studied theoretically by using the principle of key layer of water barrier.Based on the discussion of the mechanics failure mechanism of rock disk in karst tunnel fault section, the hydraulic model of fault inrush under the condition of dissolving cavity located on the side of tunnel is established, and the formula for calculating the minimum safe thickness of rock plate in karst tunnel fault section is derived.The determination of the minimum safe thickness of the rock plate is discussed with an engineering example.For compressive faults, the minimum safe thickness is calculated according to the boundary of water pressure 0. 8 MPa, when less than 0. 8 MPa, the bending strength should be analyzed, otherwise the shear strength should be analyzed, and zero water pressure should not be ignored.The length of the upper and lower part of the lateral rock mass should be taken into account in the calculation of the minimum safe thickness, the longer part is more easily destroyed, and the lower part of the same time is liable to be destroyed.The minimum safe thickness of the rock plate is determined, the mechanical properties of the rock plate, the water pressure of the dissolved cavity and the radius of the tunnel are taken into account, which provides a concrete reference for the design and construction of the lateral karst tunnel fault section.
【作者单位】：西南石油大学地球科学与技术学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;西南石油大学土木工程与建筑学院;中铁西南科学研究院有限公司;
【基金】：中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1308)
【分类号】：U456.33

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