Abstract
According to the surrounding rock conditions of Re Shuitang Tunnel NO.2, it is analyzed whether the CRD method is suitable for such surrounding rock conditions. By comparing and analyzing the distribution of plastic zone of surrounding rock during construction and the displacement deformation of tunnel monitoring point, the tunnel is constructed. The plastic zone of the middle arch and the arch is obviously changed, and should be reinforced. The settlement of the right vault and the side wall is larger than the left side, which is about 19.8% and 21.9%. According to the analysis results, the vault should be reinforced in advance during tunnel construction to prevent collapse and ensure construction safety, and provide reference for future construction.
Highlights
The tunnel excavation is constructed by the CRD method
The numerical simulation method is used to analyze the deformation of the surrounding rock structure when the tunnel is excavated by the CRD method
It can be seen that with the excavation of the left guide hole, the distribution of the plastic zone mainly occurs at the arch shoulder and the arch foot, and the plastic zone at the arch is small; with the excavation of the right guide pit, the force is redistributed and excavated
Summary
The tunnel excavation is constructed by the CRD method. Under the condition of poor stability of the surrounding rock, whether the construction safety can be ensured, the construction progress is ensured, and the danger of collapse is prevented. It is important to use the CRD method to meet the stability requirements during tunnel excavation in the condition of poor surrounding rock conditions, and to ensure the safety of construction [1-3]. Domestic and foreign scholars have used the theoretical analysis and numerical simulation to do the following research on the tunnel construction using the CRD method: Wang Chunhe et al analyzed the surrounding rock deformation during the excavation using the up-and-down step method and the CRD method, and obtained the CRD method for controlling deformation and plasticity. The numerical simulation method is used to analyze the deformation of the surrounding rock structure when the tunnel is excavated by the CRD method. By comparing the change of plastic zone and displacement deformation of surrounding rock structure, the corresponding treatment measures are put forward to provide research guarantee for construction safety and normal operation of highways. By comparing the change of plastic zone and displacement deformation of surrounding rock structure, the corresponding treatment measures are put forward to provide research guarantee for construction safety and normal operation of highways. [6-9]
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