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Study of the horizontal crack of hard rock or sprayed concrete on high sidewall of large underground cavern

机译：大型地下洞室高侧壁上坚硬岩石或喷射混凝土水平裂缝的研究

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摘要

During the construction of underground engineering horizontal or nearly horizontal cracks have been observed usually on the surface of high sidewall in large underground cavern, which would influence the local stability. The creaking mechanism on high sidewall of large cavern was studied through the case study of Laxiwa underground main powerhouse. By the numerical simulation of cavern opening, the changing of displacement and stress of rock were revealed. And the results indicated that the surface rock of high sidewall goes through the sharp displacement release and stress unloading. Several main factors which could induce cracks of sidewall have been summarized, including hard rock mass with very low tension strength, caver profile with large erective surface, considerable displacement of rock mass at high sidewall and redistributed stress state with tension stress. And an index considering unload strain energy (USE) was introduced to evaluate the intensity and depth of crack on high sideward. Some enginee ing measurements were discussed also to deal with cracking of high sidewall.
机译：在地下工程施工期间，通常在大型地下洞室的高侧壁表面上观察到水平或近乎水平的裂缝，这会影响局部稳定性。通过拉西瓦地下主厂房的实例研究了大洞室高侧壁的蠕动机理。通过洞口的数值模拟，揭示了岩石位移和应力的变化。结果表明，高侧壁面岩石经历了急剧的位移释放和应力卸载。总结了可能引起侧壁裂缝的几个主要因素，包括抗张强度很低的坚硬岩体，大正立面的岩洞轮廓，高侧壁处岩体的相当大的位移以及具有拉应力的重新分布应力状态。并引入了考虑卸载应变能（USE）的指标，以评估高侧裂缝的强度和深度。还讨论了一些工程测量以应对高侧壁开裂的问题。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

    Q. Jiang; X.T. Feng; C.P. Shi; C. Jing; Y.J. Jiang;

  • 作者单位

    State Kev Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics. Chinese Academy of Sciences, Wuhan, China;

    State Kev Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics. Chinese Academy of Sciences, Wuhan, China;

    State Kev Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics. Chinese Academy of Sciences, Wuhan, China;

    State Kev Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics. Chinese Academy of Sciences, Wuhan, China;

    Department of Civil Engineering, Faculty of Engineering, Nagasaki University, Nagasaki, Japan;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 岩石（岩体）力学及岩石测试;
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