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| Stiffness design theory for tunnel-support system |
| ZHANG Dingli，FANG Huangcheng，CHEN Liping，SUN Zhenyu |
| (Key Laboratory for Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China) |
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Abstract Surrounding rock deformation is the source of the supporting load and most tunnel accidents，so tunnel engineering design should focus on the deformation control. In general，the surrounding rock deformation is essentially caused by the unbalanced force，and its amount is the result of the interaction between the surrounding rock load and the supporting resistance. In this paper，a dynamic analysis model for surrounding rock deformation is established using Newton¢s second law and an explicit expression of surrounding rock deformation is thus obtained，which can be used to predict and evaluate the deformation process of the surrounding rock. Generally，the support stiffness determines the surrounding rock deformation under given stratum conditions. Therefore，the distribution of the support stiffness should be calculated according to the requirements of deformation control，which is the core content of the proposed support stiffness design theory. Since the internal force of the supporting structure increases with increasing the stiffness，a structural strength checking method is given to dynamically adjust the support stiffness and deformation control objectives. Based on the above basic principles，a theoretical system of “surrounding rock deformation control as the goal，support stiffness design as the core and strength checking as the guarantee” is formed. Finally，the collaborative control theory and design method of the surrounding rock-supporting structure system are given to overcome the difficulties of large deformation and serious advanced failure in complex tunnels.
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2021, Vol. 40 
