Research on Construction Technology of Cave-in Treatment of Large Underground Cavern after Initial Support
When the middle and lower layers of a large underground cavern are excavated,the upper half of the cavern has been initially completed.Compared with the cave-in during the excavation of the upper half of the cavern,the cave-in at this time is larger in scale and the upper cavity will be higher and the cave-in system is formed by the accumulation of a large number of blocks of stones.The cavities between the blocks are large,and the upper steel supports are also mixed in the cave-in,conventional supporting means such as small conduit grouting and pipe shed are not applicable.Taking the treatment of cave-in in the upper half of the cave-in hole which has been excavated and supported during the middle level excavation of the spillway tunnel in Pangduo Water Conservancy Project in Xizang Province as an example,the treatment and construction of the cave-in sec-tion are successfully completed according to the principles of section disposal,strengthening support,clearing first and filling later,ensuring safe construction.
Pangduo Water Conservancy ProjectLarge cavernFirst clean and then fillSegmented disposalCa-ve-inConstruction technology
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