广州南沙某深厚软土区综合管廊基坑变形破坏分析

doi:10.13722/j.cnki.jrme.2021.1218

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Abstract The Guangdong-Hong Kong-Macao Greater Bay Area is the most economically developed regions in China and has an important strategic position in national development. However，due to the extensive distribution of marine soft clay，it has brought many challenges to engineering construction. Based on the theoretical and numerical analysis and monitoring data in Nansha，Guangzhou. This paper discusses the cause of failure and deformation characteristics of a utility tunnel excavation. The research results show that the failure mode of this excavation belongs to the combined damage of kicking and dumping，mainly kicking damage. The horizontal displacement of the pile top points to right. The reasons for this phenomenon are that the distance between the vehicle and the excavation is too small and trucks are overload. Due to the support by the cross brace，the horizontal displacement and vertical displacement of steel sheet pile are still relatively small and stable before the excavation is destroyed，and cannot effectively reflect the safety of the excavation. Therefore，attention should be paid to the monitoring of the surrounding ground settlement and deformation of the deep horizontal displacement. The maximum deep horizontal displacement is at a depth of 6–11 m，which is below the bottom of the excavation. This deformation is different from that in the non-soft soil area. The deformation of the deep horizontal displacement reaches a depth of about 18 m，indicating that the deformation of the supporting pile caused by the excavation reaches 12 m below the bottom，and the ratio of deformation depth to the excavation depth is 3. The damaged location of the excavation should be backfilled in time.

Key words： soil mechanics soft clay of Nansha utility tunnel soft soil excavation failure mechanism

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SONG Xugen. Analysis of the deformation and failure mechanism of a utility tunnel excavation in the deep and soft clay area of Nansha，Guangzhou#br#[J]. , 2023, 42(S1): 3629-3642.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1218 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3629

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