Volume 26 Issue 2
Apr.  2020
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Article Navigation >  Journal of Geomechanics  > 2020  >  26(2): 221-231
WANG Qingbing, HUANG Qiangbing, YAN Yufeng, et al., 2020. Study on influence of construction precipitation on surface settlement and stratum stress on the ground fissure site. Journal of Geomechanics, 26 (2): 221-231. DOI: 10.12090/j.issn.1006-6616.2020.26.02.021
Citation: WANG Qingbing, HUANG Qiangbing, YAN Yufeng, et al., 2020. Study on influence of construction precipitation on surface settlement and stratum stress on the ground fissure site. Journal of Geomechanics, 26 (2): 221-231. DOI: 10.12090/j.issn.1006-6616.2020.26.02.021
shu

Study on influence of construction precipitation on surface settlement and stratum stress on the ground fissure site

doi: 10.12090/j.issn.1006-6616.2020.26.02.021
  • 1.

    Beijing Municipal Road & Bridge Group Co, . Ltd, Beijing 100071, China

  • 2.

    Department of Geological Engineering, Chang'an University, Xi'an 710054, Shannxi, China

  • 3.

    School of Highway, Chang'an University, Xi'an 710054, Shannxi, China

More Information
  • Received: 2019-08-26
  • Revised: 2019-11-28
  • Published: 2020-04-28
    Abstract
  • Ground fissure is a typical urban geological disaster in Xi'an city, and the change of groundwater level is an important factor in inducing ground fissure activity. Taking construction precipitation in underground excavation section of Xi'an Metro Line 6 as the engineering background, based on the finite element numerical simulation, the surface settlement law and strata stress variation characteristics caused by construction precipitation on ground fissure site were analyzed. The research results show that when groundwater level falls, the surface settlement deformation of the hanging wall is greater than that of the footwall, and there is a phenomenon of differential settlement on both sides of the ground fissure zone. The maximum differential settlement is approximately in a linear relationship with the depth of the groundwater level decline. At different positions, the lateral surface settlement curve shows a "Z" shape. The differential settlement area changes with the position of ground fissures, and the curve shows quadratic function between differential settlement and lateral position. In addition, with the groundwater level falling, the vertical stress of the stratum increases with the decrease of the underground water level, and there is a sudden change in the stratum stress at the location of the ground fissure and curve shows cubic polynomial function between stress affected area and depth. Based on the layer-wise summation method, the analytical solution of the surface settlement when the groundwater level falls is calculated. By comparing the calculation results with that of the numerical simulation, it shows a basic consistency, and the empirical formula for calculating the maximum surface settlement is obtained. The research results can provide scientific guidance for the safe construction of underground tunnel and other underground projects on ground fissure sites.

     

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