Discussion on the mechanism of ground improvement method at the excavation of shallow overburden tunnel in difficult ground
Discussion on the mechanism of ground improvement method at the excavation of shallow overburden tunnel in difficult ground
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DOI：
10.1016/j.undsp.2016.11.003
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发表时间：
2016-12
影响因子：
6.4
通讯作者：
K. Kishida;Ying Cui;M. Nonomura;T. Iura;M. Kimura
中科院分区：
文献类型：
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作者：
K. Kishida;Ying Cui;M. Nonomura;T. Iura;M. Kimura
隧道施工的机会，涉及浅覆盖层下困难（例如，松软、不牢固）的土地在日本不断增加。各种山岭隧道开挖辅助方法已被开发出来，并能满足严格的施工要求。作为浅埋隧道施工的辅助方法之一，地基处理法能够有效地控制软土地基下的沉降量。然而，地基加固方法的机理尚未明确，也没有建立合适的设计规范，因此，由于对加固地基的强度和加固区域的合适长度和宽度还没有完全了解，因此在每种情况下都采用了经验设计。本文通过活板门试验和数值分析，对基坑开挖过程中的力学行为，包括稳定土的力学行为进行了评价。此外，还讨论了地基处理法的应用对隧道稳定性的增强作用。
Tunnel construction opportunities involving shallow overburdens under difficult (e.g., soft, unconsolidated) grounds have been increasing in Japan. Various auxiliary methods for excavating mountain tunnels have been developed and can satisfy stringent construction requirements. The ground improvement method, which is one of the auxiliary methods for shallow overburden tunnels, has demonstrated its ability to effectively control the amount of settlement under soft ground. However, the mechanism of the ground improvement method has not been clarified, nor has a suitable design code been established for it. Therefore, because the strength of the improved ground and the suitable length and width of the improved area have not been fully understood, an empirical design has been applied in every case. In this paper, the mechanical behavior during the excavation, including that of the stabilized ground, is evaluated through trapdoor experiments and numerical analyses. In addition, the enhancement of tunnel stability resulting from the application of the ground improvement method is discussed.