Abstract
Taking several tunnels under construction of a highway as the research object, the ultimate displacement of four buried depth sections of 0-50, 50-100, 100-300, 300-500 m in the surrounding rock of grade III, IV and V is numerically simulated by three-step and seven-step excavation method, middle-wall method, cross-middle-wall method and double-side-wall guide pit method for initial support of large-section highway tunnels. Through analysis, the deformation law of tunnel surrounding rock is obtained: under the same buried depth, the displacement ultimate displacement of the two-sided guide pit method and the cross-middle-wall method is the largest, the middle-wall method is the second, and the three-step seven-step excavation method is the smallest. Through the analysis and collation of the measured data obtained by monitoring and measurement of each construction method in the construction site, the surrounding rock deformation datum values of large-span and large-section tunnel under each construction method are obtained.
Highlights
Tunnel engineering is facing complex underground geological environment
The reason is that the safety management system of field personnel is still imperfect and does not rely on modern monitoring technology
It is necessary to establish the surrounding rock deformation benchmark values of large-span and large-cross-section tunnels under various construction methods to establish a practical and efficient management system based on monitoring and measurement information for early warning and feedback. [2,3,4]
Summary
Tunnel engineering is facing complex underground geological environment. Under the existing technical conditions, it is still difficult to ascertain the accurate geological information in front of the tunnel face. The relevant construction technology standards have been formulated in the field of highway tunnel engineering, construction safety accidents still exist [1]. It is necessary to establish the surrounding rock deformation benchmark values of large-span and large-cross-section tunnels under various construction methods to establish a practical and efficient management system based on monitoring and measurement information for early warning and feedback. By means of numerical simulation, the corresponding safety datum values of different surrounding rock depths and construction methods of large section highway tunnels are analyzed and obtained. This conclusion makes the construction monitoring, early warning and construction management of large section tunnels reliable, and the tunnel collapse risk is effectively controlled
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