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| The deformation pattern of soft rock tunnels with high ground stress |
| CAI Zunle1, LIANG Qingguo1*, CAO Shenghui2, LI Qidi1, WU Xiaohui2, ZHOU Ren3
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1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;
2. Lanzhou-Xinjiang Railway Gan-Qing Co., Ltd., Lanzhou 730030, Gansu, China;
3. China Railway No. 2 Engineering Group Co., Ltd., Chengdu 610031, Sichuan, China |
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Abstract In order to study the deformation law of soft rock tunnels within high geo-stress, the paper quantitatively analyzed the relationships between the deformation value with the compressive strength of rock mass, the integrity of surrounding rock, the geo-stress & depth of tunnel, the coefficient of lateral stress, the ground water, the value of basic quality［BQ］ and the stiffness of support of soft rock tunnel within high geo-stress based on the statistics of monitoring dada from 68 monitoring sections in 41 tunnels. The results indicated that the large deformation of surrounding rock in soft rock tunnel within high geo-stress was the outcome of the comprehensive action of geological conditions of surrounding rock, the design and construction parameters and other factors. Among them, the in-situ geo-stress, surrounding rock characteristics and supporting countermeasures had the significant influence. The results from the case statistics could preliminarily reveal the development level of the control technology of large deformation of soft rock traffic tunnel within high geo-stress in China. The deformation of soft rock tunnel within high geo-stress had noticeable time-space effect with the variation patterns from the rapid growth stage to the continuing growth stage and then the stabilizing stage at last with time. The deformation coordination coefficient was mostly affected by the excavation with large fluctuations in the early stage, but tended to be stable very soon after the inverted arch was constructed which also verified and emphasized the key role of the ring closure to the deformation control from another perspective. With the increase of large deformation grade, the proportion of the deformation after construction of inverted arch decreased.
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Received: 26 August 2023
Published: 19 December 2023
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