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Volume 41 Issue 1
Feb.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(1): 34-46
CUI Xuan,HU Qiang.Research on treatment effect of karst cave in deep-buried highway tunnel and response law of tunnel structure[J].Carsologica Sinica,2022,41(01):34-46. doi: 10.11932/karst2022y001
Citation: CUI Xuan,HU Qiang.Research on treatment effect of karst cave in deep-buried highway tunnel and response law of tunnel structure[J].Carsologica Sinica,2022,41(01):34-46. doi: 10.11932/karst2022y001
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Research on treatment effect of karst cave in deep-buried highway tunnel and response law of tunnel structure

doi: 10.11932/karst2022y001

  • Guizhou Transportation Planning Survey &Design Academe Co.， Ltd.，Guiyang， Guizhou 550008，China

  • Received Date: 2020-12-17
  • Publish Date: 2022-02-25
    Abstract
  • Karst landform has brought great hidden dangers to the construction and operation of transportation infrastructure. In order to eliminate the risk of covered karst to tunnel construction and operation， two methods of tunnel slag backfilling and bridge crossing have been proposed for the treatment of covered karst cave exposed during construction in the engineering background of Pingluo Tunnel II of Pingtang-Luodian Expressway in Guizhou Province. After the comprehensive comparison of the two methods in terms of technology and economy， tunnel slag backfilling is decided as the optimal treatment method of the karst cave. To verify its rationality， a three-dimensional model under two conditions before and after treatment of karst cave was established by using finite element software Midas GTS. The treatment effect of backfilling of karst cave quantitatively was evaluated from four perspectives： displacement of surrounding rock， internal force of support structure， distribution characteristics of plastic zone of surrounding rock and its equivalent stress. The results show that the displacement peak value of surrounding rock decreased by 32.6% from -4.671 mm before the treatment to -3.148 mm after the treatment. Furthermore， after karst cave treatment， the peak value of settlement of left tunnel arch and of right tunnel arch respectively decreased 0.567 mm （by 15.6%） and 0.503 mm （by 21%）. Before and after the treatment， anchors in tunnel system were mainly tensioned， and few of them were under pressure. System anchors could effectively play their suspension role. The stress data of system anchor show that the peak value of system anchor force decreased by 32.6% from 35.37 kN to 32.48 kN after the backfilling of karst cave. Distribution characteristics of plastic zone of surrounding rocks are able to reflect the scope of loosening and destruction of surrounding rocks. Before the karst tunnel was filled and treated， excavation of the right tunnel had caused great disturbance to surrounding rocks below the arch shoulder of the tunnel and on both sides of the karst tunnel， especially to the left side of the karst tunnel and the right side of the tunnel. The surrounding rocks were basically in the state of plastic loosening. After the treatment with filling， the plastic zone of surrounding rock was only distributed in the range of side walls on both sides of the left and right tunnel， and the original cavity zone on the lower side of tunnel lining structure also changed from plastic loose zone to elastic zone. It indicates that the backfilling of karst cave can effectively limit the downward development of plastic zone of surrounding rocks and significantly improve the safety of rock pillars in tunnel. To verify the rationality of distribution characteristics of tunnel plastic zone， Von-Mises equivalent stresses at different parts of tunnel structure on left and right lines were extracted for analysis. The data shows that the equivalent stresses at right arch waist of the right line tunnel and 10 m below the right wall of the tunnel can be effectively reduced after the backfilling of the karst tunnel. The equivalent stresses of surrounding rocks at the two locations were reduced by 72.5% and 88.4%， respectively. The accumulated displacement values of YK16+595 section vault and camber of right-line tunnel do not exceed the standard warning values， and no mud burst， or water inrush accidents have occurred since the karst cave was exposed in 2016. Therefore， the higher feasibility of backfilling scheme has been verified，and the relevant achievements can provide new ideas for the treatment of karst tunnel in deep-buried highway with short clear distance.

     

    • CUI Xuan,HU Qiang.Research on treatment effect of karst cave in deep-buried highway tunnel and response law of tunnel structure[J].Carsologica Sinica,2022,41(01):34-46.
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