某沉管工程水下基槽开挖施工方案比选探讨

摘要

A caisson tunnel had complicated design section of foundation trench, high accuracy of foundation excavation, tight schedule, great difficulty in excavation in slightly weathered rock, and high-standard inspection.To address these technical difficulties and based on this caisson tunnel, the excavation method in rock foundation and the construction scheme are discussed in detail.According to the project scale, geological characteristics and the surrounding environment, the method of foundation excavation under the water is determined through the principles, advantages and disadvantages, the applicable range, and the main parameters of each method.Also, announcements of the excavation method for foundation trench are given.Research results have certain reference to the similar rock foundation excavations under water.%某沉管隧道基槽设计断面复杂、工期紧、验评标准高,微风化岩质上开挖施工难度大.根据沉管工程规模、基槽地质特点及周边环境,进行优缺点分析和主要指标比较,提出可行的水下基槽施工方法及应用注意事项,可为同类工程提供借鉴.