富水黄土隧道超前降水与隧底加固施工技术研究
Research on construction technology of advance dewatering and foundation reinforcement at the bottom of water-rich loess tunnel
张殿鹏1
作者信息
- 1. 中铁十九局集团第三工程有限公司,辽宁 沈阳 110136
- 折叠
摘要
本文以某高铁隧道实际工程为例,研究了富水黄土隧道开挖过程中遇到的渗水、土体软弱剥落、支护变形与隧基软弱等施工技术难题,采取了地表降水和隧底软基注浆加固综合治理措施,并对其效果进行了分析和验证.结果显示:1)地表降水方案应根据现场试验涌水量进行设计,结合掌子面实际情况或深井疏干试验结果确定参数,以确保设计方案与实际情况相符;2)地表超前降水措施可有效提前疏干洞身周边土体,提高围岩稳定性,便于施工作业,并比洞内排水方式更为有效;3)采用袖阀管注浆加固隧底在减少施工干扰、堵水和加固软塑土体方面效果更佳,相较于钢管桩加固方案更为优越.
Abstract
Taking an actual high-speed railway tunnel project as an example,this paper researches the construction technological difficulties encountered during the excavation process of water-rich loess tunnel,such as water seepage,soft spalling of soil,support deformation,and tunnel foundation weakness.Comprehensive treatment measures such as surface dewatering and grouting reinforcement of the soft foundation at the bottom of the tunnel are adopted,and their effects are analyzed and verified.The results show that:1)The surface dewatering scheme should be designed based on the water yield of on-site test,and the parameters should be determined in combination with the actual situation of the tunnel face or the results of the deep well drainage test to ensure that the design scheme is consistent with the actual situation;2)The measures of surface advance dewatering can effectively drain the soil around the tunnel in advance,improve the stability of the surrounding rock,facilitate construction operations,and be more effective than the drainage method inside the tunnel;3)The use of sleeve valve pipe grouting to reinforce the tunnel bottom has a better effect in minimizing construction interferences,blocking water,and reinforcing soft plastic soil,which is superior to the steel pipe pile reinforcement scheme.
关键词
黄土隧道/地表降水/袖阀管注浆/隧底加固Key words
loess tunnel/surface dewatering/grouting of sleeve valve pipes/tunnel foundation reinforcement引用本文复制引用
出版年
2024
NETL
NSTL
万方数据