厦门翔安海底隧道CRD法施工数值分析

厦门海底隧道属国内首建,出口端地层软弱、易膨胀、随挖随塌,稳定性差,施工难度很大。根据该地段的地质条件,设计六种不同的开挖与支护工况,利用数值法分别模拟这六种开挖过程的地层三维变形状态,分析和总结其变形、失稳规律,优化隧道开挖和支护方案及其工艺,提出了实用且可靠的施工措施和建议,有效地指导了施工,解决了施工技术难题。为同类工程建设提供了理论依据和实践经验。

The Numerical Analysis of Construction with CRD Method in Xiamen Xiangan Submarine Tunnel

Xiamen Xiangan Submarine Tunnel is the first one in mainland of China.The strata at the tunnel entrance are weak and easy to swell,the collapse occurs immediately after the excavation,the stability is very low and the construction is very difficult.Based on the geological conditions of the entrance section,the authors designed six different schemes of excavations and supporting methods,stimulated the 3D deformation states of the strata in the six excavation processes by means of numerical method,analyzed and summarized the laws of deformation and unstable occurrences of tunnels and optimized the schemes of excavation and supporting technologies.Finally,the applied construction measures and suggestions are proposed,providing the theoretical basis and practical experiences for the similar construction engineering.