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徐强, 白超宇, 彭建兵, 卢全中, 李文阳. 受限场地装配式管廊穿越活动地裂缝土压力演化规律研究[J]. 岩土工程学报, 2023, 45(8): 1615-1624. DOI: 10.11779/CJGE20221309
引用本文: 徐强, 白超宇, 彭建兵, 卢全中, 李文阳. 受限场地装配式管廊穿越活动地裂缝土压力演化规律研究[J]. 岩土工程学报, 2023, 45(8): 1615-1624. DOI: 10.11779/CJGE20221309
XU Qiang, BAI Chaoyu, PENG Jianbing, LU Quanzhong, LI Wenyang. Evolution of soil pressure of prefabricated utility tunnel crossing activeground fissures in confined site[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(8): 1615-1624. DOI: 10.11779/CJGE20221309
Citation: XU Qiang, BAI Chaoyu, PENG Jianbing, LU Quanzhong, LI Wenyang. Evolution of soil pressure of prefabricated utility tunnel crossing activeground fissures in confined site[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(8): 1615-1624. DOI: 10.11779/CJGE20221309

受限场地装配式管廊穿越活动地裂缝土压力演化规律研究

Evolution of soil pressure of prefabricated utility tunnel crossing activeground fissures in confined site

  • 摘要: 地下综合管廊穿越活动地裂缝时,必将受到地裂缝活动作用影响。为探明地裂缝活动对装配式综合管廊周围土体应力分布的影响,通过物理模型试验,对活动地裂缝作用下管廊与土体接触压力和管廊周围土体压力变化进行了监测,监测土压力位置分别是模型箱底板轴线、管廊底板轴线、管廊底板侧边线、模型箱侧壁以及管廊顶板轴线。试验结果表明,在地裂缝活动作用下,地层裂缝首先出现在管廊下部的地裂缝处,初期反映为剪切裂缝,地表裂缝处于受拉状态;管廊变形对土体竖向应力影响主要集中地裂缝处与管廊上盘末端,上盘土体的受力状态较为稳定,而土层中应力重新分布主要集中在下盘管廊底部,地裂缝活动时,管廊变形对周围土体的影响幅度从底板中线两侧逐渐衰减。研究成果可对地裂缝多发地区装配式管廊的灾害防治与地基处理提供借鉴。

     

    Abstract: The underground utility tunnel is inevitably affected by ground fissures when crossing active ground fissures. The distribution of soil stress around the utility tunnel is studied through a large physical model test by monitoring the contact pressure between the soil and the structure around the utility tunnel. The monitoring positions are located at the bottom axis of the test box, bottom axis of the utility tunnel, bottom side line of the utility tunnel, side wall of the test box and top axis of the utility tunnel respectively. The results show that the cracks first appear near the preset ground fissure with a shear state, leading to tension state at the top face of soil. The effects of the deformation of the utility tunnel on soil stress are mainly concentrated at the end of the hanging wall and the position near the ground fissure. The stress state of the soil in hanging wall is relatively stable. However, the stress redistribution is mainly at the bottom of the utility tunnel, and the effects of the deformation of the utility tunnel on the surrounding soil decrease from the bottom axis to the sides gradually. The research results can be used for disaster prevention and foundation treatment of prefabricated utility tunnels in the areas with frequent ground fissure disasters.

     

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