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| Curtain grouting test and seepage control effect analysis of underground water-sealed oil storage |
| DING Changdong1, ZHANG Yihu1*, LI Ling2, LUO Rong1, FAN Lei1, DING Xiang3, CAO Lei2
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1. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, China;
2. First Engineering Bureau Co., Ltd., China Anneng Construction Group, Nanning 530221, Guangxi, China;
3. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, Hubei, China |
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Abstract Based on the background of an underground water-sealed cavern, curtain grouting technology was introduced to seal the cavern due to the water seepage caused by the development of water-conducting structure in the engineering area. The influence of curtain grouting on the permeability of rock mass and its seepage control effect in the cavern project were studied by means of field tests and numerical simulation. The results showed that during the implementation of curtain grouting in sequence, after Ⅰ-holes grouting, the permeability of the rock mass at the Ⅱ-holes was weakened, and the hydraulic conductivity before grouting and unit ash consumption had a better law of decreasing in sequence. When the permeability of the rock mass was large, it had good groutability and large ash consumption, the hydraulic conductivity and unit ash consumption decreased obviously during grouting in Ⅱ-holes, and the permeability reduction effect of grouting was also more significant. The hydraulic conductivity of Ⅰ-holes in curtain grouting was related to the burial depth of the grouting hole section. Outside the scope of blasting influence, grouting pressure should be increased appropriately to increase ash consumption, and better grouting results may be achieved. The seepage field analysis revealed that the anti-seepage curtain had a positive effect on reducing the permeability of the water-conducting structure within the grouting range, which could partially cut off the seepage of the natural groundwater along the main water-conducting structures into the cavern, and then played a role in controlling the overall water inflow in the cavern to a certain extent.
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Published: 10 April 2024
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