摘要
以香山隧道工程为依托,采用数值模拟和现场试验相结合的方法,研究分析了富水弱胶结砂岩地层采用地表深井降水对隧道周围地下水位的影响规律,并对其降水效果及适用性进行了检验。结果表明,当采用地表超深井降水时,前50 d地下水位大幅度下降,50~90 d时地下水位小幅度降低,第90 d时水位达到稳定,地下水位降低至拱顶以下2~7 m;隧道围岩采用周边注浆加固时,阻水效果明显,可有效降低隧道周围水头压力,显著改变围岩特性,提高围岩承载力;地表超深井降水结合隧道周边注浆加固措施,富水砂岩地层含水率可有效降低至10%左右。为确保富水砂岩隧道施工安全,隧道开挖之前应考虑降水井的最大出水能力并选择经济合理的预抽水时间。
Based on the Xiangshan Tunnel Project,the influence of surface deep well precipitation on the groundwater level around the tunnel was studied and analyzed by using the method of numerical simulation and field test,and the effect and applicability of precipitation were tested.The results showed that when the surface ultra-deep well precipitation was used,the groundwater level decreased significantly in the first 50 days,decreased slightly in the 50~90 days,reached a stable level on the 90th day,and decreased to 2~7 m below 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 and the grouting reinforcement measures around the tunnel,the water content of the water-rich sandstone formation can be effectively reduced to about 10%.In order to ensure the safety of water-rich sandstone tunnel construction,the maximum water output capacity of the dewatering well should be considered before tunnel excavation and an economical and reasonable pre-pumping time should be selected.
作者
张宏
ZHANG Hong(China Railway Lanzhou Group Co.,Ltd.,Lanzhou 730030,China)
出处
《粘接》
2025年第5期167-170,共4页
Adhesion
关键词
富水弱胶结砂岩
隧道
地表深井降水
周边注浆加固
water-rich sandstone tunnel
surface deep well precipitation
peripheral grouting
