China News Service, Enshi, May 23 (Tan Yuanzhi, Jiao Guobin, Li Weikang) Zhengzhou-Wanzhou High-speed Railway's important and difficult project to control the construction period-Xiangshuwan Tunnel was completed on the 22nd, which marked the major progress in the construction of the Hubei section of Zheng-wan High-speed Railway. The opening of operations as scheduled has laid the foundation.
The Xiangshuwan Tunnel crosses Wushan County, Chongqing and Badong County, Hubei, with a total length of 12,475 meters. The geological structure of the tunnel is complex and changeable. The main risks of construction include weakening of the surrounding rock, collapse and roof failure. The construction is difficult, and the safety risk is high. It is a high risk. Weak surrounding rock tunnel.
According to Tan Zeyi, Project Manager of the Second Division of Zhengwan High-speed Railway, China Railway Fifth Bureau, the large-scale mechanical supporting construction of large-section tunnels with weak surrounding rocks has always been a technical problem in the construction of complex geological tunnels on long and large railways in China, and the Xiangshuwan tunnel is mainly composed of weak surrounding rocks. , The tunnel traverses stratums such as mudstone interbedded with sandstone, broken silty clay, etc., affected by the structure, the rock mass is relatively broken, and the tunnel's grade IV and grade V soft surrounding rocks account for 99%.
The Xiangshuwan Tunnel is the most difficult project of the Zhengwan High-speed Railway. Photo by Tan Yuanzhi
During the construction, the China Railway Fifth Bureau adopted informatization and intelligent management, introduced digital, intelligent and information advanced supporting equipment such as a fully computerized three-arm rock drilling rig, and carried out supporting constructions such as advanced high-pressure splitting and grouting of weak surrounding rocks. The technology has achieved a breakthrough of 100 meters in monthly excavation in weak surrounding rocks for 14 consecutive months, setting a new record of 145 meters in monthly excavation of grade IV and V weak surrounding rocks.
"The whole tunnel of Xiangshuwan Tunnel has accumulated valuable experience for the rapid mechanized construction of my country's long and large railway tunnels, and laid the foundation for the Zhengwan High-speed Railway to open and operate as scheduled." Tan Zeyi said.
The Zhengwan High-speed Railway is an important part of the "eight vertical and eight horizontal" high-speed railway network in the national medium- and long-term railway network planning. It starts from Zhengzhou, Henan in the north, and ends at Wanzhou, Chongqing in the south. The total length of the line is 818 kilometers, and the design speed is 350 kilometers per hour. It is of great significance to promote the social and economic development of Henan, Hubei, Chongqing and other places and areas along the route.
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