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| Field test research on applicability of grout materials in water-rich fractured rock grouting engineering |
| WANG Jiwei1, ZHANG Lianzhen2*, ZHANG Qingsong3, YANG Pei3, CHEN Xin3, WANG Jianhui1,HAN Zichuan2, WANG Hongchao2, SUN Zizheng4, TU Wenfeng4
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1. The 5th Engineering Co., Ltd., China Railway 19th Bureau Group, Dalian 116600, Liaoning, China;
2. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
3. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China;
4.School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China |
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Abstract Relying on the actual engineering case of grouting water plugging in water-rich fractured rock of Qingdao Metro, the field test of the applicability of grouting materials was carried out. The applicability of regular cement slurry, cement-sodium silicate slurry, and superfine cement slurry under the water yield standard requirements of two inspection holes, 0.2 L·min-1·m-1 and 0.01 L·min-1·m-1, was studied. Suggestions for water plugging grouting materials in water-rich fractured rock that match the requirements of different standards were proposed. The applicability of the grouting material was verified by means of Borehole TV and actual excavation verification. Research indicated: it was difficult to meet the requirements of waterless operation by using regular cement slurry alone(the water yield from the borehole was less than 0.01 L·min-1·m-1), but after repeated grouting, the water yield from the borehole could meet the requirement of no more than 0.2 L·min-1·m-1. Cement-sodium silicate slurries had a short gel time, which could effectively limit the diffusion scope of the slurry. By coordination application of regular cement slurry and cement-sodium silicate slurry, the grouting effect was significantly better than regular cement single-liquid slurry; The superfine cement slurry had low particle size, which could effectively fill the micro-fracture space in the water-rich fractured rock and improve the water plugging efficiency of the tunnel surrounding rock. The use of regular cement slurry, cement-sodium silicate slurry and superfine cement slurry to carry out advanced curtain grouting of water-rich fractured rock could meet the requirements of tunnels waterless operation. The research results could provide a basis for the treatment design of grouting and field construction in water-rich fractured rock.
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Received: 20 January 2021
Published: 20 March 2021
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