Abstract In order to deal with the difficulty of grouting process control of the tunnel in the surrounding rock of fully-weathered granite under high pressure and abundant water, a technology of combination of drainage and grouting is proposed. Concentrated high-pressure and water-rich area of tunnel surrounding rock is explored and analyzed by a comprehensive exploration method, the area for drainage and energy release beyond curtain is identified,the method of determining locations of water drainage holes and safety control measures are studied, and the effect of numbers of water drainage holes and drainage capacity on curtain grouting is researched. Connectivity test is conducted to disclose the distribution characteristics of water conducting fractures within curtain area, and the types of grouts and mix ratios regarding safe and controllable grouting in different areas of water drainage and curtain grouting are determined based on the laboratory test. The practical application results show the flow path of underground water in the drainage and energy release area beyond the curtain is changed and the surrounding rock in the area of curtain grouting is improved and good effect is obtained attributed to safe water drainage and controllable grouting.
Abstract：
In order to deal with the difficulty of grouting process control of the tunnel in the surrounding rock of fully-weathered granite under high pressure and abundant water, a technology of combination of drainage and grouting is proposed. Concentrated high-pressure and water-rich area of tunnel surrounding rock is explored and analyzed by a comprehensive exploration method, the area for drainage and energy release beyond curtain is identified,the method of determining locations of water drainage holes and safety control measures are studied, and the effect of numbers of water drainage holes and drainage capacity on curtain grouting is researched. Connectivity test is conducted to disclose the distribution characteristics of water conducting fractures within curtain area, and the types of grouts and mix ratios regarding safe and controllable grouting in different areas of water drainage and curtain grouting are determined based on the laboratory test. The practical application results show the flow path of underground water in the drainage and energy release area beyond the curtain is changed and the surrounding rock in the area of curtain grouting is improved and good effect is obtained attributed to safe water drainage and controllable grouting.
WANG Hongmei1 PAN Guangming1 LIU Chunguo2 ZHANG Hongshun2
.Research and Application of“ Drainage and Grouting Combination Technology”for Tunnels in High-pressure Water-rich Surrounding Rock[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 208-214
2020, Vol. 57 