海底隧道施工安全评价的初步研究

PRELIMINARY RESEARCH ON SAFETY EVALUATION FOR SUBSEA TUNNEL CONSTRUCTION

由于工程地质条件的多变性和不确定性,隧道及地下工程施工中,特别是海底隧道的施工,存在着较多危险源。但目前针对其施工安全评价尚缺少较好的方法。借鉴风险分析的方法,对海底隧道施工过程中的危险源进行辨识,并结合多年隧道地下工程施工安全的经验,以岩体工程分类法为建立模型的基础,综合应用国内外岩体力学研究和测试的成果,根据影响隧道施工安全的主要因素及其权重,导出具有针对性的危险性评价指数,并据此将海底隧道的施工分为6个安全等级,建立针对海底隧道施工安全的分级体系。工程实例表明,其安全评价结果和施工实际较为接近。

Due to the polytrope and uncertainty of geological conditions,there are many risk ources in the construction of tunnel and underground projects,especially for subsea tunnel construction. Up to now,there is a proper method for safety evaluation of subsea tunnel construction. Based on the risk analysis,the risk sources have been identified. Combining with the experiences in the safe construction of tunnel and underground engineering, based on the classification of rock mass,the achievements in rock mechanics and measuring techniques,and the research experiences in safety evaluation,a safety evaluation system for subsea tunnel construction is established. The main relevant factors and their weight coefficients directly influencing the construction safety of subsea tunnel are given. Accordingly a system with six ranks from I to VI is put forward. The evaluation method put forward above has been applied to a practical engineering. The results show that the safety evaluation result is closed to the practical one.