Investigation into the Performance of a Covered Top-Down Pit-in-Pit Deep Excavation in Shenzhen Soil-Rock Mixed Strata

Chen, Yang; Jia, Pengjiao; Ji, Xinbo

doi:10.1007/s13369-021-05373-5

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…The majority of scholars still study the self-stability characteristics of the deep foundation pits in rock strata based on the relevant theories of that in soil strata. Due to the significant differences between the rock mass and the soil mass 6 – 9 , it is obviously biased to use the foundation pit related theories in soil strata to study that in rock strata 10 , 11 . The correct understanding and reasonable evaluation of the self-stability characteristics of the foundation pit vertical-rock-wall in rock strata have important practical significance and theoretical value.…”

Section: Introductionmentioning

confidence: 99%

Study on the critical stable height of vertical excavation in rocky foundation pit within layered structural plane

Zhang,

You,

Zhang

et al. 2024

Sci Rep

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The structural plane characteristic was the most critical factor for determining the self-stability ability of deep foundation pit vertical-rock-wall in layered rock stratum. Multiple methods such as model testing, numerical calculation, and theoretical calculation were utilized comprehensively in this paper. The self-stabilizing control effect on the deep foundation pits vertical-rock-wall that under the different structural plane inclination angle (α) and under the different structural plane strength was systematically studied. The results indicated that the overall variation trend of "Sharp decrease ~ Slow decrease ~ Slow increase ~ Sharp increase" in the symmetrical distribution for the self-stability critical height (Hcr) varied with the gradually increasing of α was presented. Meanwhile, the variation trend of "continuously decreasing and rapidly decreasing first, and then slowly decreasing and tending to stabilize" with the structural plane strength reduction coefficient (k). The key factor to control the self-stability of the deep foundation pit vertical-rock-walls lied in fully grasping and utilizing the basic characteristics of rock structural planes. The research results of this paper provided the theoretical basis for scientifically determining the safety level and designing reasonable support structures of the deep foundation pit vertical-rock-walls in layered rock stratum.

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Section: Introductionmentioning

confidence: 99%

Study on the critical stable height of vertical excavation in rocky foundation pit within layered structural plane

Zhang,

You,

Zhang

et al. 2024

Sci Rep

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“…Li [18] summarized the deformation characteristics of deep foundation pit under three typical strata of Xiamen Metro; Tong [19] did detailed research on the key technology of deep foundation pit in pebble stratum in Chengdu area. Chen et al [20] studied a deformation case of pit in pit (PIP) excavation support structure in Shenzhen soil-rock composite stratum.…”

Section: Introductionmentioning

confidence: 99%

Deformation Analysis and Prediction of Foundation Pit in Soil-Rock Composite Stratum

Qin

Tao²,

Chen

et al. 2022

Front. Phys.

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The deformation prediction of foundation pit is still an open issue in geotechnique engineering. This paper focuses on a new deformation prediction method of foundation pit in soil-rock composite stratum in Nanjing area. To do so, the field monitoring deformation data of deep foundation pit adjacent to the railway in a soil-rock combined stratum is firstly analyzed. Based on these field data, the characteristics of horizontal displacement and surface settlement of rock-socketed support pile, as well as its relationship with Earth excavation are discussed. Results show that the average value of maximum horizontal displacement of support pile in zone with shallow rock depth (soil layer >15 m) is relatively large, which is 3.5 times of that with shallow soil depth (10–12 m into moderately-weathered mudstone). The depth of maximum horizontal displacement is obviously linearly related to the thickness of soil layer (H), while the surface settlement does not change with the increase of soil/rock layer thickness ratio. Utilizing the relationship between the maximum water level displacement and excavation depth, a new Gaussian-type empirical formulation is established to predict horizontal deformation of soil-rock composite stratum with rock-socketed support pile. By comparison with two other methods, it is found that the improved Gaussian curve is in good agreement with the measured horizontal displacement curve. This indicates that the new method can provide a valid reference for the design and construction of foundation pit with rock-socketed support pile in Nanjing area.

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Analysis of observed performance of a deep excavation straddled by shallowly buried pressurized pipelines and underneath traversed by planned tunnels

Guo

Gong

Wang

et al. 2023

Tunnelling and Underground Space Technology

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Investigation into the Performance of a Covered Top-Down Pit-in-Pit Deep Excavation in Shenzhen Soil-Rock Mixed Strata

Cited by 4 publications

References 27 publications

Study on the critical stable height of vertical excavation in rocky foundation pit within layered structural plane

Study on the critical stable height of vertical excavation in rocky foundation pit within layered structural plane

Deformation Analysis and Prediction of Foundation Pit in Soil-Rock Composite Stratum

Analysis of observed performance of a deep excavation straddled by shallowly buried pressurized pipelines and underneath traversed by planned tunnels

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