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研究浅埋区间隧道开挖引起的地表沉降对维护施工安全、降低施工风险具有十分重要的实际意义,但目前广泛应用的Peck公式对浅埋区间隧道的适用性较差。本文以北京地铁14号线与7号线10个地铁区间工程为背景,基于叠加原理,研究适合于浅埋双线隧道的叠加Peck公式的应用;通过对大量现场监控量测数据进行位移反分析,得到适用叠加公式的区间隧道埋深范围;总结北京地区黏性土与砂性土互层的特定地质条件下浅埋双线隧道开挖引起的沉降槽宽度参数K和地层损失率Vl的取值范围;通过实际工程的验证,证明所研究的沉降公式的有效性与可靠性,结果可为北京地区后续的地铁建设提供参考和依据。
It is very important to study the ground settlement caused by tunnel excavation in shallow section to maintain the construction safety and reduce the construction risk. However, Peck’s formula widely used nowadays has poor applicability to shallow section tunnels. Based on the superposition principle, the application of superposition Peck formula suitable for shallow double-line tunnels is studied in this paper. Based on the analysis of a large number of on-site monitoring measurement data by displacement back analysis , And the overlapping range of the tunnel is obtained by applying the superposition formula. The parameters of settlement channel width K and formation loss Vl induced by the shallow double-line tunnel excavation under the specific geological conditions of the interbedded clay and sandy soil in Beijing are summarized Through the verification of the actual project, the validity and reliability of the settlement formula studied are proved. The results can provide reference and basis for the follow-up subway construction in Beijing.