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为准确计算沉管隧道大开挖引起的基础坑底回弹再压缩,对粉质黏土和粉砂两种土样开展室内试验研究。提出根据卸荷比大小分段考虑回弹模量参数取值,对再压缩模量取为定值,归一化处理后进行回弹和再压缩的变形量计算,并与已有回弹量实测值的工程实例对比分析,结果表明新方法计算结果与工程实测结果吻合较好。运用该方法分析港珠澳大桥海底沉管隧道工程,确定了隧道开挖卸荷最大影响深度为开挖深度的1.73倍,强回弹区回弹量约为总回弹量的60%,为准确控制海底沉管隧道的最终变形量提供理论依据。
In order to accurately calculate the springback and recompression of foundation pit caused by large excavation of immersed tunnel, indoor tests were conducted on two types of silty clay and silt. According to the size of the unloading ratio, the paper takes into account the values of the parameters of the resilient modulus, the values of the values of the compressive modulus as the normalized values, the calculation of the springback and the recompression after the normalization, and compares it with the existing springback The results of the actual project comparative analysis, the results show that the results of the new method and the measured results agree well. Using this method to analyze the submarine immersed tunnel project of Hong Kong-Zhuhai-Macao Bridge, it is found that the maximum unloading impact of tunnel excavation is 1.73 times of the excavation depth and the springback area in the strong rebound zone is about 60% of the total springback, which is Provide a theoretical basis for accurately controlling the final deformation of the submarine immersed tunnel.