Abstract
This study presents a combined anti-sliding structural system of micropile groups, with an arched shape on the plane and cement paste between the micropiles, in the Tizicao high-position landslide study conducted in the Wenchuan seismic area, China. Improvements in the landslide’s stability as a result of the embedded micropile groups alone and in combination with long prestressed anchor cables are studied using FD-SRM and FOS contour analysis methods, respectively. The soil arching effect and the load sharing of the arched micropile group are analyzed using the numerical simulation method. Findings show that the arching effect is due to arc-shaped arrangements of the micropile groups. The design scheme of the embedded micropile groups improves the stability of this kind of thickly layered, high-position landslide. Moreover, its construction is convenient and the mechanism is clear, making it a good engineering reference for the treatment of similar landslides. The improvement in the landslide’s stability is even better than that achieved by the combination of micropile groups and long prestressed anchor cables. Furthermore, the arching effect of multiple rows of micropile groups is significant and can effectively block the movement of the sliding body. The load transfer involved in the micropile–soil interaction process is a new type of two-part load sharing pattern. The soil arching behind the micropile groups takes more than 80% of the total load. A tangential tension zone appeared along the top of the pile–group arc crown when the arch protruded upward, and a related structural performance design should be considered in the future.
Highlights
In recent years, catastrophic, high-position landslides have often occurred in seismically affected areas, such as the Wenchuan area in China
This study presents a combined anti-sliding structural system of micropile groups, with an arched shape on the plane and cement paste between the micropiles, in the Tizicao high-position landslide study conducted in the Wenchuan seismic area, China
Findings show that the arching effect is due to arc-shaped arrangements of the micropile groups
Summary
Catastrophic, high-position landslides have often occurred in seismically affected areas, such as the Wenchuan area in China. With the fast development of numerical modeling technology, Martin and Chen (2005) and Li and Tang (2013) proposed the load sharing law of anti-sliding piles due to the soil arching effect under the horizontal movement of the slope (Qin and Ni, 2017; Ji and Ni, 2018). They analyzed the related parameters, such as the pile spacing and shearing parameters, of the sliding mass, and the pile–soil interface. On the basis of the mechanical analysis and numerical modeling conducted using the FD software FLAC2D and FLAC3D, this study provides a scientific basis for the design of an anti-sliding micropile group for high-position landslides
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