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隧道变形失稳过程与破坏判据研究是地下工程的热点与难点之一。运用耗散结构理论,分析了隧道变形失稳的能量耗散过程与演化特征;结合热力学基本定律,研究了整个隧道系统的能量耗散机制,建立了隧道变形失稳的能量演化模型。在此基础上,分别给出了大数据量(≥3000)与小数据量(<3000)条件下稳定性演化过程的能量判别准则;根据隧道系统变形失稳演化各阶段特征,提出了其失稳破坏的能量判据。将研究成果应用于广州地铁某立体交叉隧道的稳定性分析,验证了该能量演化模型与判据的合理可靠性,其结果对隧道稳定性状态的判别具有一定指导意义。
The research on tunnel destabilization process and failure criterion is one of the hot spots and difficult points in underground engineering. Based on the dissipative structure theory, the energy dissipation process and evolution characteristics of the tunnel instability are analyzed. Based on the basic laws of thermodynamics, the energy dissipation mechanism of the tunnel system is studied and the energy evolution model of the tunnel instability is established. On this basis, the energy criterion for the evolution of stability under large data volume (≥3000) and small data volume (<3000) are given respectively. According to the characteristics of each phase of deformation and instability of tunnel system, Steady energy criterion. The research results are applied to the stability analysis of a three-dimensional cross-overpass in Guangzhou Metro, which verifies the reasonable reliability of the energy evolution model and criterion. The result is of guiding significance for the discrimination of tunnel stability status.