ZHANG Min - qing,HUANG Hong - jian,HE Zhi - jun,REN Cheng - min,ZHANG Wen - qiang
铁道工程学报. 2013, 30(3): 50-57.
Research purposes: It is difficult to control the large deformation of the high stress soft rock tunnel in the tunnel construction. The Lanzhou - Chongqing Railway has 29 high stress soft rock tunnels,and in spite of using a lot of technologies to control the deformation,but the large deformations still happened to the primary supports in the 4 kilometers long area and the rigid frames had to be replaced. The big deformations produced the big impact on the construction. So. It was necessary and important to do the research on the technology for control of the deformation of the high stress soft rock tunnel in order to guarantee the engineering quality,speed up the construction process and guarantee the construction security.
Research conclusions: ( 1 ) To evaluate the danger of the large deformation is the important to prevent the large deformation of the high stress soft rock tunnel,and the evaluation content should include the three areas of the grading of the high stress soft rock tunnel,the deformation calculation and formulation of the responsibility for the failure of the primary support. ( 2 ) The release - constraint balancing method is used for releasing the ground stress by allowing deformation volume according to the features of the high stress soft rock tunnel and constraining the deformation by strengthening the primary support and lock pin,closing timely and dynamically reinforcing. The engineering application in the Lanzhou - Chongqing Railway shows this method is available for controlling the big deformation of the high stress soft rock tunnel.