Study of Load Back Analysis for Arch-shaped Primary Lining Structure in Shallowly Buried Tunnel Sections
Based on the monitoring data of initial masonry-surrounding rock interlayer pressure,initial masonry stress of steel arch frame and relative peripheral convergence of upper steps,a plane finite el-ement model of semi-circular arch initial masonry structure was established.The response of complex surrounding rock was simulated by unknown radial and tangential loads,and the influence line method was proposed to carry out the back analysis of structural loads based on monitoring data.The results show that the load back analysis method can accurately simulate the interaction between surrounding rock and unclosed supporting structure in complex shallow buried section,and the back analysis re-sults are effective,reliable and timely.
tunnel engineeringshallow-buried weak rock masses sectionmonitoring and measure-mentunknown load back analysis
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