海底隧道长距离全-强风化地层CRD施工方法研究

 厦门翔安隧道陆域端存在800～1000m的全风化土层和全—强风化的岩土互层地层，隧道埋深6～30m，其中6～17m占80％以上，属于浅埋-超浅埋隧道，全部位于地下水位以下，并受厦门地区强降雨的影响，隧道地下水非常丰富，土层遇水即崩解坍塌。隧道采用CRD工法进行施工，主要就上述地层该工法的施工步序、初支参数、施工步长、设备配置等应用结合工程实例进行了论述，并得出了类似地层的施工参数。

Study on CRD Construction Method for Long-distance Fully-heavily Weathered Ground of Sub-sea Tunnel

On the coast land portion of Xiang’an sub sea tunnel in Xiamen, China, there exist 800～1000m long fully weathered soil ground and fully heavily weathered rock/soil alternative ground. The cover depth of the coast land portion of Xian’an sub sea tunnel ranges from 6m to 30m, however, the cover depth of more than 80% of the coast land portion of the tunnel ranges from 6m to 17m. Therefore, the coast land portion of Xiang’an sub sea tunnel belongs to shallow/super shallow covered tunnel. The coast land portion of the tunnel is completely located below the ground water table. Furthermore, due to the heavy rainfall in Xiamen area, the ground contains abundant ground water. The soil ground of the tunnel will collapse as soon as water is encountered. The tunnel is constructed by means of CRD method. On basis of the construction of the tunnel, the author expounds on the construction sequences, primary reinforcement parameters, construction step lengths and equipment matching of CRD construction method adopted for the mentioned ground and draws some conclusions related to the construction parameters in similar grounds.