Optimizing the Grouting Design for Groundwater Inrush Control in Completely Weathered Granite Tunnel: An Experimental and Field Investigation

Weihua Zheng, Dengwu Wang, Guijin Li, Lin Qin, Kai Luo and Jinquan Liu
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Weihua Zheng: Jiangxi Vocational and Technical College of Communication, Nanchang 330000, China
Dengwu Wang: Jiangxi Road and Port Engineering Bureau, Nanchang 330000, Jiangxi, China
Guijin Li: Jiangxi Vocational and Technical College of Communication, Nanchang 330000, China
Lin Qin: Guangxi Computing Center Co., Ltd., Nanning 530022, China
Kai Luo: Jiangxi Road and Port Engineering Bureau, Nanchang 330000, Jiangxi, China
Jinquan Liu: Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Quanzhou 362000, China

Sustainability, 2019, vol. 11, issue 13, 1-15

Abstract: Groundwater and mud inrush disaster from completely weathered granite presents a huge difficulty for tunnel construction, which requires the grouting measurement with favorable performance. To propose the optimal material parameters for grouting, numerous tests, including strength, permeability, and anti-washout, were conducted to evaluate the effects of grouting filling ratio (GFR), curing age and water velocity on the grouting effect. The test results show that: (1) The hydraulic property of completely weathered granite can be significantly improved by increasing the grouting volume and curing age. In particular, when GFR ≥ 48%, the cohesion and internal friction angle increased to about 200 kPa and 30°, which were more than three and ten times of that pre-grouting. (2) With the increase of GFR, the permeability exhibited three stages: Slowly decreasing stage, sharply decreasing stage and stable stage. When increased from 32% to 48%, the permeability coefficient sharply decreased two orders of magnitude, namely from 4.05 × 10 −5 cm/s to 1 × 10 −7 cm/s. (3) The particle erosion rate decreased sharply to below 10% in the low water velocity ( v ≤ 0.2 m/s) when GFR ≥ 48%, but still exceeded 50% when v ≥ 0.4m/s. The results indicated that the grouting volume of GFR = 48% was a suitable grouting parameter to reinforce the completely weathered granite, particularly in the low water velocity condition. The field investigation of hydraulic-mechanical behaviors in the Junchang tunnel indicated that the grouting effect can be improved markedly.

Keywords: groundwater control; completely weathered granite; tunnel engineering; grouting design; grouting reinforcement effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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