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首页> 外文期刊>Acta Geotechnica: An International journal for Geoengineering >Effectiveness of deep cement mixing walls with top-down construction for deep excavations in soft clay: case study and 3D simulation
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Effectiveness of deep cement mixing walls with top-down construction for deep excavations in soft clay: case study and 3D simulation

机译：深层水泥搅拌墙对软粘土深挖施工的有效性：案例研究与3D模拟

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摘要

This paper presents the observed and simulated effectiveness of deep cement mixing walls created using top-down (DCM-TD) construction techniques for a deep excavation in soft Bangkok clay. The wall system consisted of four rows of 0.7-m-diameter DCM columns, and the bracing system consisted of two 0.25-m-thick basement slabs and seven temporary struts. The effectiveness of the wall system compared to that of other wall systems was evaluated using the measured results of previous case studies. A 3D numerical analysis was performed to calculate forces in the basement slabs and bending moments in the DCM wall. Finally, series of parametric analyses of both DCM-TD and deep cement mixing walls created using bottom-up (DCM-BU) construction techniques were carried out, and their results were compared to highlight the effectiveness of DCM-TD and its applicability to excavations at greater depths. The field and numerical results show that DCM-TD is more effective than DCM-BU in terms of the limitations of lateral wall movement, the bending moment in a DCM wall and the thickness of a DCM wall for various depths because of a larger system stiffness. Therefore, DCM-TD is very effective and suitable for use in potential future deep excavations in urban areas.
机译：本文介绍了使用自上而下（DCM-TD）施工技术产生的深层水泥混合墙的观察和模拟效果，在软曼谷粘土中深挖挖掘。墙壁系统由四排0.7-m直径的DCM色谱柱组成，支撑系统由两个0.25-m厚的地下室板和七个临时支柱组成。使用先前案例研究的测量结果评估了与其他墙体系统相比的墙系统的有效性。进行3D数值分析以计算地下室板中的力和DCM壁中的弯曲力矩。最后，进行了使用自下而上（DCM-BU）施工技术的DCM-Td和深层水泥混合壁的一系列参数分析，并将其结果突出了DCM-TD的有效性及其对挖掘的适用性深度更深。该领域和数值结果表明，由于系统刚度较大。因此，DCM-TD非常有效，适用于城市地区的潜在未来的深层挖掘。

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