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the excavation of jintang undersea tunnel is like going deep into the sea and exploring the unknown deep sea. the tunnel is 16.18 kilometers long. two shield machines are excavating from ningbo and zhoushan respectively. it is technically quite challenging to overcome nearly 70% of hard rock formations. the geological conditions on the ningbo side are complex. the tunnel first passes through the city and then the sea. it has to pass under more than 40 risk sources such as oil pipelines, seawalls, docks, and port access channels.
"the geological conditions on the ningbo side are complex. the tunnel will first pass through the city and then the sea. it will pass under more than 40 risk sources such as oil pipelines, seawalls, docks, and port access channels." hu hao, project manager of the yongzhou railway of china railway 14th bureau, introduced that the "yongzhou" shield machine's construction area has hard rock and uneven hard and soft strata accounting for nearly 70%. it has to complete the excavation of 12 sections of hard rock strata and undergo 24 changes in soft and hard strata.
this complex stratum is like a "geological sandwich", with the soft soil on the upper layer like soft bread, low strength and poor stability, while the hard rock on the lower layer is like hard ham slices, with high hardness and strength. therefore, the conquest of the first section of hard rock stratum has accumulated more experience for the subsequent undersea tunnel excavation.
"such complex geological conditions make it very difficult for shield machines to operate," said dong bing, chief mechanic of the ningbo-zhoushan railway project of china railway 14th bureau group. "we must carefully plan every step to ensure smooth excavation."
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