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| Deformation laws and control measures of deep-buried loess tunnel with abundant water |
| LIU Xiaojie1, LIANG Qingguo1*, LIU Chuanxin2, ZHANG Tangjie2, WANG Wenzhuo1
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1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;
2. JSTI Group Co., Ltd., Nanjing 210000, Jiangsu, China |
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Abstract Based on a highway tunnel in loess with high water content under construction, the crown settlement and horizontal convergence of the tunnel were monitored and discussed, the causes of tunnel deformation were analyzed, and the corresponding control measures were proposed. The crown settlement was larger than the horizontal convergence of tunnel. The tunnel deformation was greatly affected by rainfall, and its stability time was basically 35 d. The tunnel deformation was roughly divided into three stages: the rapid development stage, the continuous development stage, and the stable stage. With the excavation of the upper, middle, and lower benches, the crown settlement and horizontal convergence of tunnel changed greatly. After each construction step was completed, the supporting measures such as lock-foot anchor were taken in time. Early closing of the invert could effectively control the tunnel deformation. The tunnel deformation was consistent with the exponential function rule and could be predicted by the law of exponential function. It was recommended to use arch-foot steel pipe piles and curtain grouting in the construction of water-rich loess tunnels to effectively control water leakage and large deformation of surrounding rocks.
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Received: 07 April 2021
Published: 20 June 2021
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