Influence of mud shear strength on the stability of a trench cutting re-mixing deep wall during construction

Jiang, Peng; Zhang, Qingsong; Liu, Rentai; Liu, Yankai; Li, Quanwang

doi:10.1007/s12517-020-5281-4

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…When the radius of the hole wall of the bored pile is reached r=r0, the soil layer around the side wall of the pile hole will be in a state of stress equilibrium. Under this condition, formula ( 16) is transferred to formula (21) to obtain that the stress of the hole wall at the depth of the soil layer z should meet:…”

Section: Analysis Of Stress State In Hole Wall Of Bored Pilementioning

confidence: 99%

Stability Analysis of Hole Wall for Bored Piles

LONG,

ZHANG,

et al. 2023

Preprint

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Based on the theory of small hole expansion and elastic-plastic theory, this paper studied the instability mechanism of the hole wall of bored pile, gave the stress expansion solution of the soil layer after the excavation of pile holes in the semi-infinite elastic soil layer, and established its mechanical model. Then, the stability of hole wall of bored pile in cohesive soil layer and sandy soil layer was analyzed, and the calculation formula of pile hole wall stability was obtained. Finally the stability of hole wall of bored pile under the action of mud slurry was calculated, and the stress on the pile hole wall was analyzed when local instability and overall instability occur, respectively. The results show that in sandy soil layer, the safety factor of hole wall of bored pile when it is stable has no connection with the depth of pile hole, but is related to the density of mud slurry in the pile hole. For the region of third stage expansion project of Lanzhou Zhongchuan International Airport, the critical safety stability factor for the instability of hole wall of bored pile is 0.47. When the safety stability factor is less than 0.47, the soil layer of the hole wall of bored pile would be unstable, and the hole wall will collapse. In the unstable soil layers, the pile hole wall was prone to instability, and the stability of hole wall could be improved by appropriately increasing the gravity of mud slurry. With the increase of pile diameter, the lateral displacement and deformation of hole wall increase, and the displacement of soil layer increases when the hole wall is unstable, resulting in increasing the possibility of forming variable cross-section piles correspondingly.

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Section: Analysis Of Stress State In Hole Wall Of Bored Pilementioning

confidence: 99%

Stability Analysis of Hole Wall for Bored Piles

LONG,

ZHANG,

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Construction Technology and Service Performance of Waterproof Curtain for Foundation Pit in Large-Particle Pebble Gravel Layer of Yangtze River Floodplain

Xu,

Liu,

2024

Applied Sciences

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A foundation pit is constructed in the floodplain of Yangtze River, and a deep and thick layer of large-particle pebble gravel exists below the base slab, thus forming a connected supply channel with the adjacent Yangtze River. The large water volume, high water pressure, and strong permeability of this layer bring great risks to the foundation pit construction. In view of the fact that conventional waterproof curtain construction technologies such as the deep mixing column and high-pressure jet grouting column cannot meet the engineering requirements under these kinds of geological and environmental conditions, a new waterproof curtain construction technology that combines the trenching technology of the diaphragm wall with the TRD (Trench cutting Remixing Deep wall) technology is proposed, i.e., the trenching-and-replacing-style TRD technology, as well as the construction process of this technology, is presented. After the waterproof curtain is built using the proposed technology, the strength, integrity, uniformity, and service performance of the waterproof curtain wall are tested and evaluated by the comprehensive methods of coring, borehole television imaging, resistivity CT, and a group well pumping test. The results show that the proposed technology overcomes the adverse effects of underlying large-particle pebble gravel layer, and the waterproof curtain built by it effectively cuts off the hydraulic connection inside and outside the pit. The technical proposal can provide useful references for similar projects.

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Review on the Research and Application Progress of TRD Construction Method in Foundation Pit

Wang,

Zhang,

et al. 2023

HSET

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with the development of the times, the expansion of urban scale and the development and utilization of underground space, the building foundation pit is developing in the direction of "large and deep". The traditional deep foundation pit support construction technology can no longer meet people's needs for the construction of deep and large foundation pits, thus deriving a new construction technology TRD construction method, which has a wide range of application, guaranteed wall quality and depth, and high construction efficiency. This construction method has been born for more than 30 years and has been popularized and applied in China for more than 10 years. This paper will briefly introduce the trd method from the aspects of its development, characteristics and academic research process of related applications. It is not difficult to see from the relevant research that the trd method has broad application prospects in China.

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Influence of mud shear strength on the stability of a trench cutting re-mixing deep wall during construction

Cited by 3 publications

References 9 publications

Stability Analysis of Hole Wall for Bored Piles

Stability Analysis of Hole Wall for Bored Piles

Construction Technology and Service Performance of Waterproof Curtain for Foundation Pit in Large-Particle Pebble Gravel Layer of Yangtze River Floodplain

Review on the Research and Application Progress of TRD Construction Method in Foundation Pit

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