Abstract Given the large deformation of soft rock with high ground stress in the Yuelongmen Tunnel on the newly built Chengdu-Lanzhou Railway, the concept of "active control" has been proposed. In addition to the advantage of rapid mechanized construction, the control measures including "optimized contour, two-layer support, step-by-step reservation, anchor-support combination, surrounding rock consolidation and rapid closure" are employed, where emphasis is put on the process control of deformation development. The key technology of "two-bench (inclusive of tunnel bottom) construction with short bench rapid ring closure" has been developed, to eventually achieve effective control of large deformation in soft rock.
Abstract：
Given the large deformation of soft rock with high ground stress in the Yuelongmen Tunnel on the newly built Chengdu-Lanzhou Railway, the concept of "active control" has been proposed. In addition to the advantage of rapid mechanized construction, the control measures including "optimized contour, two-layer support, step-by-step reservation, anchor-support combination, surrounding rock consolidation and rapid closure" are employed, where emphasis is put on the process control of deformation development. The key technology of "two-bench (inclusive of tunnel bottom) construction with short bench rapid ring closure" has been developed, to eventually achieve effective control of large deformation in soft rock.
LIU Guoqiang
.Study on Two-bench Construction Method with Rapid Ring Closure under the Condition of Large Soft Rock Deformation in Yuelongmen Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(3): 252-258
2023, Vol. 60 