Research on Influencing Factors of Reasonable Distance of Shallow Buried Close Tunnel in Weak Surrounding Rock

Abstract

In order to study the influence of different spans, depths, heights and initial stresses on the reasonable clearance of shallow tunnels in weak surrounding rock. This article uses numerical simulation technology. The judging standard is whether the plastic zone of the middle rock pillar is through. The factors affecting the reasonable clear distance of the small clear tunnel are analysed. The results show that the reasonable clear distance of small-distance tunnels under shallow buried conditions gradually increases as the tunnel depth increases. The reasonable clearance distance of the tunnel increases as the lateral pressure coefficient of the surrounding rock decreases. For small-distance tunnels with the same buried depth and same span, the reasonable clearance increases as the tunnel height increases.