Optimization of large deformation control parameters of layered slate tunnelsbased on numerical simulation and field test
TAO Zhigang1，2，LUO Senlin1，2，LI Mengnan1，2，REN Shulin1，2，HE Manchao1，2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，
Beijing 100083，China)
Abstract：Muzhailing tunnel，taken as the background of the research，has the worst geological condition in the whole line including strong fault tectonism，high ground stress，large depth and rich groundwater. Aiming at the damage phenomena of Muzhailing tunnel after first support such as initial support cracking，arch damaging and surrounding rock seepage，NPR bolt-mesh-cable support was applied and the deformation was successfully controlled with a maximum of 240 mm. In order to reduce the construction cost and to improve the construction efficiency，in this paper，the optimum design of the cable-line spacing of NPR anchor net was carried out. A structural element of NPR anchor cable with high constant resistance and large deformation was established by using Fish language of Flac3D，and numerical simulations of different row spacing optimization schemes were implemented to compare the normal stress，shear stress and deformation nephogram under different schemes. Field tests were conducted，and the field test results were compared with the numerical solutions. It is shown that loose ring may be affected by small footage excavation and NPR anchor mesh cable support system. At last an optimal design direction of NPR anchor mesh cable support was proposed，which provides a theoretical and practical foundation for secondary optimization. The research gives a reference for the implementation of Sichuan—Tibet Railway.
陶志刚1，2，罗森林1，2，李梦楠1，2，任树林1，2，何满潮1，2. 层状板岩隧道大变形控制参数优化数值模拟分析及现场试验[J]. 岩石力学与工程学报, 2020, 39(3): 491-506.
TAO Zhigang1，2，LUO Senlin1，2，LI Mengnan1，2，REN Shulin1，2，HE Manchao1，2. Optimization of large deformation control parameters of layered slate tunnelsbased on numerical simulation and field test. , 2020, 39(3): 491-506.
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2020, Vol. 39 
