Large-Scale Model Test of a Micropile Group for Landslide Control

A large-scale model test on the interaction between a micropile group and a landslide was conducted, to investigate the effect of micropiles on the landsides prevention. The bearing mechanism, force condition, and failure mode of a micropile group for reinforcing landslide were analyzed in detail. The results showed that the thrust force over micropiles induced by landslide showed a trapezoidal distribution, with a higher Earth pressure near the sliding surface. The resistance from the sliding body behind the pile behaved in a parabolically trend. Meanwhile, the resistance force from the sliding bed was distributed unevenly along the height direction, with a higher resistance force near the sliding surface behind the pile. When a landslide occurred, micropiles were subjected to an increase in loading and displacement, eventually to the failure state. The load-bearing sections of the micropiles were all subjected to negative bending moments, with larger bending moments within the half length of pile range near the sliding surface. The maximum negative bending moment occurred at the height of seven times the diameter of the pile above the sliding surface. The damage mode along each row of micropiles was almost the same, showing a damage area within the range of three times the diameter of the pile above and below the sliding surface. The failure of micropile induced by landslides was mainly due to a combination effect of bending and shearing near the sliding surface.

Download Full-text

Evaluation of Micropiles With Different Configuration Settings for Landslide Stabilization Based on Large-Scale Experimental Testing

Frontiers in Earth Science ◽

10.3389/feart.2021.693639 ◽

2021 ◽

Vol 9 ◽

Author(s):

Xueling Liu ◽

Jinkai Yan ◽

Bin Tong ◽

Lei Liu

Keyword(s):

Large Scale ◽

Experimental Testing ◽

Bending Moment ◽

Scale Model ◽

Sliding Surface ◽

Double Row ◽

Single Row ◽

Pile Diameter ◽

Negative Bending ◽

Landslide Stabilization

In this study, a large-scale model test was performed to investigate the effect of the single-row and double-row micropiles on the landside stabilization. For two different testing configuration settings, the bending moment along the micropiles, failure mode, and force condition were captured and compared. It is found that the landslide thrust on piles was distributed in a triangular shape. The piles in the front row carried greater pressure than the piles in the rear row. The resistance of the sliding body behind the pile was distributed in a parabolic shape, and mainly concentrated on the middle of the pile. The piles were destroyed due to the combined shearing and bending impact applied near the slipping surface. The boundary of the failure zone was from the position of two times the pile diameter under the slipping surface to the position of two and a half times the pile diameter above the slipping surface. Under the action of the landslide, each row of piles deformed at the same time. The capability of landslide stabilization for double-row piles was better than that of a single-row pile. The sections of the pile above slide surface were mainly subjected to negative bending moments and were distributed mainly within the pile length range of one-third of the anti-sliding section above the sliding surface. The pile body of the embedded section located in the range of ten times the pile diameter below the sliding surface was subjected to a positive bending moment.

Download Full-text

Ground settlement and wall deformation from a large scale model test on a single strutted sheet pile wall in sand

International Journal of Physical Modelling in Geotechnics ◽

10.1680/ijpmg.2006.060201 ◽

2006 ◽

Vol 6 (2) ◽

pp. 01-13 ◽

Cited By ~ 5

Author(s):

T. H. Tefera ◽

S. Nordal ◽

L. Grande ◽

R. Sandven ◽

A. Emdal

Keyword(s):

Model Test ◽

Large Scale ◽

Scale Model ◽

Sheet Pile ◽

Ground Settlement ◽

Large Scale Model ◽

Wall Deformation ◽

Sheet Pile Wall

Download Full-text

Investigation of Deformation of Shield Tunnel Based on Large-scale Model Test

Quarterly Report of RTRI ◽

10.2219/rtriqr.61.1_16 ◽

2020 ◽

Vol 61 (1) ◽

pp. 16-21

Author(s):

Kiwamu TSUNO ◽

Kaho KINOSHITA ◽

Takashi USHIDA

Keyword(s):

Model Test ◽

Large Scale ◽

Scale Model ◽

Shield Tunnel ◽

Large Scale Model

Download Full-text

Large scale model test investigation on wave run-up in irregular waves at slender piles

Coastal Engineering ◽

10.1016/j.coastaleng.2012.09.004 ◽

2013 ◽

Vol 72 ◽

pp. 69-79 ◽

Cited By ~ 13

Author(s):

J. Ramirez ◽

P. Frigaard ◽

T. Lykke Andersen ◽

L. de Vos

Keyword(s):

Model Test ◽

Large Scale ◽

Irregular Waves ◽

Scale Model ◽

Large Scale Model ◽

Test Investigation ◽

Run Up

Download Full-text

Recycle of resin-based analogue material for geo-mechanical model test

Waste Management & Research ◽

10.1177/0734242x18798701 ◽

2018 ◽

Vol 37 (2) ◽

pp. 142-148

Author(s):

Fan Pengxian ◽

Wang Jiabo ◽

Shi Yehui ◽

Wang Derong ◽

Tan Jinzhong ◽

...

Keyword(s):

Model Test ◽

Mechanical Model ◽

Large Scale ◽

Economic Benefits ◽

Model Tests ◽

Scale Model ◽

Large Scale Model ◽

Cyclic Utilization ◽

The Cost ◽

Recycled Material

Analogue materials are widely used to simulate prototype rocks in geo-mechanical model tests. The large amounts of solid waste generated by a large-scale model test has always posed problems for studies. The re-use of analogue materials can significantly reduce the cost of geo-mechanical model tests and the resulting environmental problems. However, despite the environmental and economic benefits, there have been few reports on the re-use of analogue materials. In this work, a recycling method for a resin-based analogue material is studied experimentally. More than 300 samples were prepared and tested. By adding a certain amount of resin in solution form to the recycled material, regenerated samples with properties consistent with those of the samples prior to recycling were obtained. Based on a comparative analysis of the test data, an equation is proposed for the calculation of the appropriate amount of resin addition in the recycling process. Thus, a simple and effective recycling method is established for a resin-based analogue material. Verification was performed by independent tests on three group samples with different proportions, and the possibility of repeated recycling was also confirmed. The proposed recycling method makes the cyclic utilization of resin-based analogue material possible and is helpful for reducing the cost and pollution of geo-mechanical model tests.

Download Full-text