古运河枢纽穿石太高速公路浅埋暗挖方案研究

南水北调中线古运河枢纽暗渠穿越石太高速公路采用浅埋暗挖技术进行施工，面临开挖跨度大（25m）、洞内围岩为粉细砂或中砂复杂结构，且石太高速为晋煤外运主要通道，日车流量达5万辆以上的高荷载频率等难题。研究认为，优化成洞开挖方案是工程成败的关键。经比较，采用中洞侧壁导坑法进行开挖，对减少高速公路路面沉降、减少开挖对邻近土体的扰动、提高围岩稳定性有明显作用，可使该工程实现安全、环保、经济多方面的效益。

The Scheme of Shallow Buried and Deep Excavated of the Ancient Canal Hinge Crossing Shitai Highway

The blind canal of ancient canal hinge crossing Shitai highway is constructed with the method of shallow buried and deep excavated. There are many difficulties in the construction, including long span of 25m, complicate rock structure, the high load frequency of tracks. Then the optimized digging scheme becomes the key point in the construction, The middle whole side drift method is proved to be useful in the reduction of road subsidence and the disturbance, and improvement to the stability of the wall rock, which can realize benefits in safety, environment protection and economy.