研究目的:长沙市湘江大道浏阳河隧道为双向四车道隧道,隧道结构形式设计复杂,分别由小净距隧道、分离式隧道和明挖隧道组成.根据暗挖段隧道现场监测成果,结合施工措施和开挖工序进行全面分析,为长沙地区水底隧道工程提供了典型参考案例.研究结论:核心土开挖后布设测点造成的总损失量较大;采用全断面帷幕注浆措施加固围岩对控制隧道拱顶沉降取得较好的效果;临时支护的拆除对拱顶沉降和围岩收敛的影响较小,采用三台阶和CD法施工浅覆土V级围岩水底隧道,能有效控制沉降.%Research purposes: The Liuyanghe Tunnel in Changsha is a bi -way and four- lane tunnel with complex structure and it is composed of a small - distance tunnel, split tunnel and cut - cover tunnel. The monitored results of settlement and convergence of surrounding rock in subsurface excavated area and the analyses of the measures taken in construction and the procedures of tunnel excavation of Liuyanghe Tunnel can be as the reference to construction of the subaqueous tunnel in Changsha.Research conclusions: The research results show if the measuring point is embed after excavation of core soil, the losses settlement is large. The full - face curtain grouting can be used to reinforce the surrounding rock to achieve better control of the vault settlement of the tunnel. The removal of temporary support has small impact on the displacement of surrounding rock. Using the three bench method and center diagram method to construct the subaqueous tunnel , the displacement of surrounding rock canbe controlled well.
展开▼
