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在隧洞工程设计中,由于受到塌落拱理论的影响,大都认为只要隧洞埋藏深度不小于规范规定的最小围岩厚度即可,而没有一个明确的适宜埋藏深度的概念,针对这一现象,本文由连续介质力学模型出发,以现行《水工隧洞设计规范》所建议的计算洞挖后需要支护提供抗力的方法为基础,首先分析了隧洞埋藏深度对围岩应力场和稳定性的影响,接着总结提出了隧洞工程适宜埋藏深度的概念及其确定的原则和方法。此外,还对水工隧洞设计规范附录八中,确定需要控制的塑性区深度的方法,提出了我们的改进建议。
In tunnel engineering design, due to the influence of the collapse arch theory, most of them think that as long as the buried depth of the tunnel is not less than the minimum thickness of the surrounding rock specified in the specification, there is no clear concept of suitable depth of burial. Starting from the continuum mechanics model, based on the current method of “resilient tunnel design specification”, which is based on the method of supporting resistance needed after calculating the excavation, the impact of tunnel burial depth on the stress field and stability of surrounding rock is first analyzed. Then, the concept of appropriate buried depth in tunnel engineering and the principles and methods for its determination are proposed. In addition, we also proposed improvements to the method for determining the depth of the plastic zone that needs to be controlled in Appendix 8 of the Design Code for Hydraulic Tunnels.