Three-Dimensional Stability Analysis of a Homogeneous Slope Reinforced with Micropiles

Sun, Shuwei; Wei, Wang; Zhao, Fuhua

doi:10.1155/2014/864017

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…In this study, the soil material of the slope is simulated with an elastic, perfectly plastic model. The yielding is described by a composite Mohr-Coulomb criterion with a tension cutoff as shown in Figure 2 [17].…”

Section: Model Of Materialsmentioning

confidence: 99%

Stability of Slopes Reinforced with Truncated Piles

Sun

Zhao

Zhang

2016

Advances in Materials Science and Engineering

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Piles are extensively used as a means of slope stabilization. A novel engineering technique of truncated piles that are unlike traditional piles is introduced in this paper. A simplified numerical method is proposed to analyze the stability of slopes stabilized with truncated piles based on the shear strength reduction method. The influential factors, which include pile diameter, pile spacing, depth of truncation, and existence of a weak layer, are systematically investigated from a practical point of view. The results show that an optimum ratio exists between the depth of truncation and the pile length above a slip surface, below which truncating behavior has no influence on the piled slope stability. This optimum ratio is bigger for slopes stabilized with more flexible piles and piles with larger spacing. Besides, truncated piles are more suitable for slopes with a thin weak layer than homogenous slopes. In practical engineering, the piles could be truncated reasonably while ensuring the reinforcement effect. The truncated part of piles can be filled with the surrounding soil and compacted to reduce costs by using fewer materials.

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Section: Model Of Materialsmentioning

confidence: 99%

Stability of Slopes Reinforced with Truncated Piles

Sun

Zhao

Zhang

2016

Advances in Materials Science and Engineering

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“…Meanwhile, the bearing capacity of micropiles can be significantly increased by changing the spacing and arrangement of micropiles. e damage is the destruction of pile-soil composites [18,19].…”

Section: Stress Characteristics Of Microsteel Pipe Pile In Cement-soimentioning

confidence: 99%

Experiment Investigation on Stress Characteristics of Grouting Microsteel Pipe Piles with Cement‐Soil Wall

Shujuan

Zhang

Bai

et al. 2020

Advances in Materials Science and Engineering

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Microsteel pipe piles are widely used in excavation support owing to their excellent bearing capacity, flexural rigidity, construction speed, and adaptability. In this study based on a project in soil-rock layers in Qingdao, China, a new type of support combining microsteel pipe piles mounted in cement-soil piles and anchors was adopted and studied. The inner force change laws and bearing capacity of microsteel pipe piles were discussed through in situ stress measurement and laboratory antibending tests on three microsteel pipe piles. It was found that the bending moment of the piles gradually increased with the foundation excavation and maximized at the pile head. The bending moment was larger at the upper and smaller at the lower part along the depth direction, indicating it is reasonable to design and calculate microsteel pipe piles by the pile-anchor system. The variation law of the foundation pit displacement with the excavation depth was monitored. The horizontal displacement of the foundation pit is the maximum at the base top, which is 6.5 mm. The flexural strength of the miniature steel tube pile after grouting is 40% higher than that of the miniature steel tube pile without grouting. It was indicated that the grouting microsteel pipe piles could be implanted in cement-soil piles, which improved the flexural rigidity of cement-soil piles and limited the deformation of foundation pits. This study provides reference for the design and construction of soil-rock foundation pit supporting projects. At the same time, it provides reference for the application of miniature steel pipe piles in other fields.

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“…According to the upper bound theorem of kinematic limit analysis, Zeng and Xiao [8] proposed an analytical method to calculate the net thrust of 3 × 3 micropile group and the sliding surface of pile slope under the specified safety factor. In addition, Chao et al, Bian, and Sun et al [9][10][11] have consistently shown that micropile has a good effect on reinforcing slopes.…”

Section: Introductionmentioning

confidence: 97%

Study on Interaction Mechanism of Natural Gas Pipe-Landslide System Reinforced by Micropile Groups Based on Model Test

Guan

et al. 2022

Geofluids

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Natural gas pipeline projects in mountainous areas are inevitably affected by geological disasters such as landslides, which pose a serious threat to the safe operation of pipelines along the routes crossing landslide areas. In this paper, based on a pipe-landslide project in a mountainous area in southwest China, the interaction mechanism and failure evolution process of the landslide-pipeline system reinforced by two kinds of micropiles are studied through indoor large-scale physical model tests, and some suggestions on the support work of the pipe-landslide project are put forward according to the test results. It was found that the deformation process of the engineering system composed of landslide, micropile, and pipeline presents a high degree of synergy under the external force and mainly experiences four stages: initial deformation period, uniform deformation period, accelerated deformation period, and residual deformation period. The bending deformation of the perforated pipe micropile is large at the 1/4 position of the pile top from the pile bottom, and the deformation of the screw micropile near the sliding surface is serious. The pipeline welding port is the weak position of the pipeline; after the failure of the pile, the pipeline interface is first cracked, along the interface position along the two ends of the tear, and finally completely broken. The screw micropile cannot effectively resist the landslide thrust at a large load level, so the risk of pipeline damage is greater. The yield strength and ultimate strength of the perforated pipe micropile are greater than those of the screw micropile, and the perforated pipe micropile can still exert a certain residual resistance after reaching the ultimate bearing capacity, which has a beneficial effect on the reinforcement of the pipeline crossing the landslide system. The research results provide important reference value for landslide-pipeline treatment engineering.

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Three-Dimensional Stability Analysis of a Homogeneous Slope Reinforced with Micropiles

Cited by 8 publications

References 16 publications

Stability of Slopes Reinforced with Truncated Piles

Stability of Slopes Reinforced with Truncated Piles

Experiment Investigation on Stress Characteristics of Grouting Microsteel Pipe Piles with Cement‐Soil Wall

Study on Interaction Mechanism of Natural Gas Pipe-Landslide System Reinforced by Micropile Groups Based on Model Test

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