On March 10, a three-axis mixer set upright a nearly 40-meter drilling rod and started to drill slowly, marking the official start of construction of shield launching shafts of the Shantou-Shanwei Railway Subsea Tunnel and the project construction process started to accelerate as a whole.

The Sixth Bid Section of Shantou-Shanwei Railway, built by the China Railway 14th Bureau Group Co., Ltd., is located in Shantou City with a total length of 23.286 kilometers. Due to complex engineering geological environment, proportion of bridges and tunnels of 92.34%, and numbers of special bridge spans, the construction is difficult. Greater Shantou Bay Area Subsea Tunnel, a part of the construction, is approximately 9.8 kilometers in length, enjoying the reputation of the first domestic high-speed railway subsea tunnel with a design standard of 350 kilometers per hour, allowing the vehicles to pass through on two lanes in a single tunnel. Under complex deep-water conditions, the construction needs to cross multiple geological faults. Shield tunneling, mining and the like are adopted to build such a railway with great construction difficulty and high risk.

Source:Shantou Daily, March 12, 2020

汕汕铁路海底隧道盾构始发井动工建设

3月10日，一台三轴搅拌机耸立将近40米的钻杆徐徐启动开始钻进，标志着汕汕铁路海底隧道盾构始发井正式开始施工，工程建设进程全面加速。

由中铁十四局集团承建的汕汕铁路六标位于汕头市境内，标段全长23.286公里，工程地质环境复杂、桥隧占比92.34%、特殊桥跨多、施工难度大。其中汕头湾海底隧道全长约9.8公里，是国内首座设计标准为350公里时速的高铁海底隧道，采用单洞双线的形式通过。其在复杂深水海域条件下，需要穿越多条地质断层，采用的工法有盾构法、矿山法等，是一条施工难度极大、风险极高的铁路。

来源：汕头日报2020-3-12