Design method for stabilization of earth slopes with micropiles

Sun, Shuwei; Zhu, Ben Zhen; Wang, Jia Chen

doi:10.1016/j.sandf.2013.06.002

Cited by 36 publications

(11 citation statements)

References 9 publications

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“…Han et al [7] and Ding et al [8] investigated the damage constitutive model of grouting and concrete, respectively. Sun et al [9] introduced a new iterative process to find the bending moment and shear capacity of the micropile section, and give a new design method for micropiles for earth slope stabilization. Fu et al [10] believed that the horizontal displacement and bending moment of cantilever double-row grouting steel pipe pile support gradually decreased with the increase of pile row spacing.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Double Row Micropiles and Anchors Composite Retaining Structure in Deep Fill Site

Liu

Mao

Zhao

et al. 2022

Advances in Civil Engineering

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In recent years, with the continuous advancement of urbanization in China and the gradual increase in the utilization scale of underground space, foundation pits may build in a narrow and compact environment. Meanwhile, miscellaneous fill layers in the city may cause construction difficulties when new foundation pits are excavated and supported. While we focus on the above problems, new retaining structure forms which are safe and economical are urgently needed. In this study, based on the excavation in a deep filling site in Jinan, the double row micropiles and anchors composite retaining structure is monitored under excavation, loading, and unloading conditions by installing sensors and testing. The stress and axial force distribution of the front and back row micropiles and anchors in the composite retaining system under different excavation depths and different loads are analyzed. The performance changes of the front and back row micropiles under different conditions and the contribution of anchors at different depths to the structure resistance during excavation and loading tests are discussed. The results show that double row steel piles and anchors composite retaining structure is feasible when excavating deep fill site in the urban area. In the composite retaining system, the stress of the front pile is greater than the back pile, the back pile has a lag when it starts working, and the axial force of the middle and upper anchor is greater than that of the bottom anchor.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Double Row Micropiles and Anchors Composite Retaining Structure in Deep Fill Site

Liu

Mao

Zhao

et al. 2022

Advances in Civil Engineering

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“…Landslides widely occur in the Three Gorges Reservoir Region in China [1][2][3][4]. Stabilizing piles, acting as retaining structures subjected to lateral loading, are widely used to improve the stability of the slopes and prevent their excessive movements [5][6][7]. The majority of studies in this field have, however, focused on the analysis of stabilizing piles embedded in homogeneous bedrock [8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The experimental analysis is conducive to highlighting the main contradictions in the test process, and it is easy to grasp the inherent connection of the discovered phenomenon, but the test period is long, the operation is complicated, and the related cost is high. Hence, numerical simulations have widely been conducted for pile-slope interaction analysis [7,29,[36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Soft and Hard Interbedded Layers of Bedrock on the Mechanical Characteristics of Stabilizing Piles

et al. 2020

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In this paper, the mechanical characteristics of stabilizing piles embedded in layered bedrocks are studied both experimentally and numerically. The influence of soft and hard interbedded layers in the structure of the bedrock on the mechanical characteristics of stabilizing piles is particularly investigated. The discrete element method is used to numerically investigate the response of the stabilizing piles embedded in composite and inclined bedrocks. The simulation results and comparison with experimental data are presented to demonstrate the effectiveness and accuracy of the discrete element model. As the dip angle of the soft/hard interbedded bedrock layers increases from 0° to 45°, it is observed that the displacement of the embedded section of the stabilizing pile increases and reaches the maximum displacement at 45°. In the range of 45° to 75°, the influence of the dip angle of the layered bedrock on the displacement of the embedded section of the pile is gradually reduced.

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“…Reese et al (1992) described a procedure for the design of slopes reinforced with micropiles. Based on the conventional beam-column equation and existing P-y curve method, Sun et al (2013b) proposed an analytical model, which includes details about selecting micropile cross-section, estimating the length of the micropile, determining the shear capacity of micropiles, calculating pile spacing and so on.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of micropiles-reinforced landslide based on shaking table test

Yu-ming

Yuan

et al. 2019

Geomatics, Natural Hazards and Risk

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A series of shaking table tests were conducted on unreinforced and micropiles-reinforced soil landslides to investigate the seismic response of micropiles-reinforced landslide and the dynamic mechanical behaviour of micropiles in landslide under earthquake. The test results indicate that: (1) The micropiles can raise the antiseismic performance of landslide, and it can efficiently delay the development of earthquake landslide hazards. (2) After earthquake, the flexural failure of micropile mainly occurs in the area that 1.4-4 times pile diameter above the sliding surface and the area that 1.4-3.4 times pile diameter below the sliding surface. (3) After reinforced by micropiles, the acceleration response on the slope surface of landslide can be decreased, especially the slope toe. (4) Both thrust of sliding mass and resistance of sliding bed are mainly concentrated near the sliding surface. The dynamic bending moment distributions of the three rows of micropiles present as reverse 'S'. The maximum bending moment of the pile above sliding surface is located at the point that 3.7 times pile diameter above sliding surface, and the maximum bending moment of the pile below sliding surface is located to the point that 1.43 times pile diameter below sliding surface.

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Design method for stabilization of earth slopes with micropiles

Cited by 36 publications

References 9 publications

Experimental Study on Double Row Micropiles and Anchors Composite Retaining Structure in Deep Fill Site

Experimental Study on Double Row Micropiles and Anchors Composite Retaining Structure in Deep Fill Site

Effect of the Soft and Hard Interbedded Layers of Bedrock on the Mechanical Characteristics of Stabilizing Piles

Seismic response of micropiles-reinforced landslide based on shaking table test

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