富水砂层中盾构隧道联络通道施工技术

发布时间：2018-08-22 17:56

【摘要】：在富水砂层中进行联络通道施工,施工难度和风险很大,为提高围岩稳定性、减小施工对周围环境的影响,通过对常用的降水、冷冻、旋喷和注浆等地层加固方法进行技术和经济方面的对比,最终选择了注浆和降水相结合的加固方案。在联络通道施工中采取了洞内超前预注浆、洞外地表管井降水以及洞内轻型井点降水的加固方案,在水仓基坑施工中采取了周边小导管注浆以及坑内轻型井点降水的加固方案。施工过程中对隧道和地表变形进行了监测,由监测结果可知,开挖引起的隧道和地表变形均较小,说明采取的超前预注浆和洞内外降水措施是安全可靠的,可以有效降低联络通道的施工风险。
[Abstract]:In order to improve the stability of surrounding rock and reduce the influence of construction on the surrounding environment, the construction of connection passage in water-rich sand layer is very difficult and risky. The technical and economic aspects of stratum reinforcement methods such as rotary jet grouting and grouting are compared, and the reinforcement scheme combining grouting and precipitation is finally selected. In the construction of the connection passage, the reinforcement scheme of pre-grouting in the tunnel, the dewatering of the surface pipe well outside the hole and the dewatering of the light well point in the hole is adopted. The reinforcement scheme of the surrounding small pipe grouting and the light well point dewatering in the pit is adopted in the foundation pit construction of the water warehouse. In the course of construction, the tunnel and surface deformation are monitored. According to the monitoring results, the tunnel and surface deformation caused by excavation are small, which shows that the advanced pre-grouting and dewatering inside and outside the tunnel are safe and reliable. It can effectively reduce the construction risk of contact passage.
【作者单位】：中铁隧道集团有限公司勘测设计研究院;中铁隧道集团三处有限公司;
【分类号】：U455.43

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