龙井隧道半明半暗进洞方案设计与施工

Plan design of portal excavation with semi-open and semi-underground method and the construction of Longjing tunnel

就永武高速公路龙井隧道左洞进口洞口存在斜交偏压问题,介绍了半明半暗进洞方案的设计和施工,指出该方案有利于降低洞口边坡高度,有利于环境保护,有利于隧道洞口施工和运营安全,具有一定的推广价值。

As there is skew unsylmnetrical pressure in left entrance of Yong-Wu freeway Longjing tunnel, it introduces the design and construction of portal excavation with semi-open and semi-underground method, and points out that this plan is helpful to lower the height of the slope of the cave, protect the environment and the construct the tunnel and guarantee its safety, which is worth to promote.