Favorable of grouted micropiles for the load transfer in weak sandy soils

Al-Obaidi, Ahmed; Al-Karawi, Ansam

doi:10.1051/matecconf/201816201018

Cited by 2 publications

(1 citation statement)

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“…Scholars have carried out relevant research work on the design method and antisliding performance of micropile-reinforced slopes. Al-Obaidi and Al-Karawi [6] studied the influence of micropile length, diameter, grouting length, and soft soil type on load transfer and ultimate bearing capacity of micropile. Based on the assumption of sliding surface stress, Dong-ping et al [7] established a new limit equilibrium method (LEM) to analyze the stability of antislide micropile-reinforced slope.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%