香山隧道新近系富水弱胶结砂岩地层深井降水研究

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关键词：富水弱胶结砂岩；隧道；地表深井降水；周边注浆加固中图分类号： ；U455.49 文献标志码：A文章编号：1001-5922（2025）05-0167-04

Abstract：Based on the Xiangshan Tunnel Project，the influence of surface deep well precipitation on the groundwaterlevelaroundthe tunnel was studiedandanalyzedbyusing the methodof numericalsimulationand fieldtest，and theeffect and applicabilityof precipitation were tested.The resultsshowed that when thesurface ultra-deep well precipitation was used，the groundwater level decreased significantlyinthe first5O days，decreased slightly in the 50～90 days，reacheda stablelevel onthe9Othday，and decreased to 2～7 mbelow the vault.When the surrounding rock of the tunnel was reinforced by peripheral grouting，the water blocking effect was obvious，which can effectively reduce the head pressure around the tunnel，significantly change the characteristics of the surrounding rock， and improve the bearing capacity of the surrounding rock.Combined with the surface ultra-deep well precipitation andthe grouting reinforcement measures around the tunnel，the water content of the water-rich sandstone formation canbe effectively reduced to about 10%. In order to ensure the safety of water-rich sandstone tunnel construction， the maximum water output capacityof the dewatering well should be considered before tunnel excavation and an economical and reasonable pre-pumping time should be selected.

Key words ：water-rich sandstone tunnel ； surface deep well precipitation ； peripheral grouting

在富水砂岩隧道施工中，围岩遇水易软化、滑塌及塑性挤出。（剩余5123字）