关键词: 浅埋隧道, 衬砌支护, 地面荷载, 围岩应力, 复变函数, 解析解

Abstract: The aim of this study is to probe into the influence of ground load on the surrounding rock stress of shallow-buried tunnel with lining support. On the basis of Verruijt’s research on surrounding rock stress of shallow tunnel under complex boundary conditions, the analytical solution to surrounding rock stress under the combined action of lining support and ground surface load were obtained, and the influences of multiple factors on the stress field were examined. Results demonstrated that greater surface load resulted in larger circumferential stress at tunnel waist and smaller circumferential stress at tunnel bottom; larger internal pressure led to smaller circumferential stress at tunnel waist and greater circumferential stress at tunnel bottom. Ground load and lining support will not change the distribution law of circumferential stress around the shallow tunnel and its most unfavorable position, but will change its magnitude and direction. In the process of excavation, the soil is prone to suffer from instability and damage at the haunch of the tunnel.

Key words: shallow tunnel, lining support, ground load, surrounding rock stress, complex function, analytical solution