Model test research on implementation effect of pre-lining method of tunnel in weak surrounding rock
WANG Daoyuan1,2,3,WANG Qinglei1,YUAN Jinxiu2,LI Wenjiang1,ZHU Yongquan1,3
(1. School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;2. Department of Civil Engineering,Hebei Jiaotong Vocational and Technical College,Shijiazhuang,Hebei 050091,China;3. Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
Abstract:Preconvergent deformation,convergent deformation,face extrusion displacement,radial pressure of surrounding rock and failure process of instability are analyzed under the normal load and overload,a model test of large three-dimensional geomechanics outside the pit is carried out for the pre-lining method of tunnel in soft surrounding rock. The rate of preconvergence is reduced by 20%–30%,the settlement of the vault and the horizontal convergence can be reduced by 25% and 80%,the pressure of surrounding rock in the circumference of the hole is increased by 1.1 times while the pre-lining method is used in double line railway tunnel under the geological conditions of the fully weathered granite with grade V. The longitudinal influence range of the advanced core soil is about 0.3D in condition A and 0.7D in condition B,the decline is nearly 60%. The instability process of tunnel is peeling-slip-collapse of rock mass,and the collapse is finally formed with 2 m depth of side wall,1.4 m depth of vault,1.2 m depth of excavating face. Limit displacement value of stability criterion of tunnel is recommended 157 mm of vault settlement,93 mm of horizontal convergence and 225 mm of face extrusion displacement. The research results provide a certain theoretical basis for the full-face excavation of large machinery with pre-lining according to the basic theory of ADECO-RS.
王道远1,2,3,王庆磊1,袁金秀2,李文江1,朱永全1,3. 软弱围岩隧道预衬砌法实施效果模型试验研究[J]. 岩石力学与工程学报, 2019, 38(S1): 2790-2797.
WANG Daoyuan1,2,3,WANG Qinglei1,YUAN Jinxiu2,LI Wenjiang1,ZHU Yongquan1,3. Model test research on implementation effect of pre-lining method of tunnel in weak surrounding rock. , 2019, 38(S1): 2790-2797.
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