土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (4): 635-639.

• 测试技术 • 上一篇    下一篇

地铁穿越岩溶区地表塌陷特征及微观力学试验研究

屈若枫1，彭圣刚2，周志鹏3   

  1. （1.武汉地铁集团有限公司，武汉 430074；2.湖北工业大学土木建筑与环境学院，武汉 430074；3.武汉地铁资源经营有限公司，武汉 430000）
  • 收稿日期:2021-02-01 修回日期:2021-02-25 出版日期:2022-08-30 发布日期:2022-08-25
  • 通讯作者: 彭圣刚（2000-），男，本科生，研究方向为安全工程。
  • 作者简介:屈若枫（1988-），男，高级工程师，研究方向为地铁安全。
  • 基金资助:
    国家自然科学基金资助项目（41972286）

Experimental Study on Micro Mechanics and Features of Karst Ground Subsidence in Wuhan Subway Tunnel Crossing Area

QU Ruofeng1, PENG Shenggang2， ZHOU Zhipeng3   

  1. (1.Wuhan Metro Group Co. Ltd., Wuhan 430074；
    2.School of Civil and Environmental Engineering, Hubei University of Technology, Wuhan 430071；
    3.WUHAN METRO RESOURCES OPERATION CO., LTD.， Wuhan 430000)
  • Received:2021-02-01 Revised:2021-02-25 Online:2022-08-30 Published:2022-08-25

摘要： 武汉地铁穿越区的岩溶地表塌陷问题目前已经成为该市地铁建设中亟待解决的问题，为更好探究武汉地区岩溶地表塌陷特征及机理，开展了以下研究工作：①通过可视化的塌陷物理试验，研究了典型地质结构条件下的塌陷特征以及微观力学特征；②基于颗粒流PFC软件平台，对武汉地铁穿越区的典型岩溶地质模型塌陷过程进行了数值模拟；③以砂层地质结构模型为研究对象，研究了在不同振动频率和振幅条件下土体中孔隙水压力和孔隙率的发展规律，并通过室内实验进行了对比分析。


关键词: 地质结构, 岩溶地面塌陷, 孔隙水压力, 孔隙率, PFC-CFD

Abstract: The ground subsidence induced by the subway tunnel crossing the karst terrain in Wuhan City is becoming an imperative issue to be resolved in the tunnel engineering practice. This paper presents the research results of the process and mechanical features of the ground subsidence in the karst terrain under different geological conditions. The following topics have been evaluated and studied: 1): a new visualization experimental device was developed to investigate the micro-mechanics under different geological and hydrodynamic conditions. 2): Development process of the ground subsidence over karst terrain under the four typical geological structure conditions was performed based on the PFC-CFD method. 3): Utilizing the pure sand collapse model as the research object, the development of pore water pressure and porosity under different vibration frequency and amplitude was studied, and the comparative analysis was performed by laboratory experiments. 

Key words: Geological Tectonic Structure, Ground Subsidence in Karst Terrain, Pore Water Pressure, Porosity, Particle Flow Code-Computational Fluid Dynamics (PFC-CFD)

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