Abstract
This article aims to study the mechanical behavior of a deep excavation occurring in sandy soils retained by anchored pile walls under anchorage failure conditions. The primary causes and types of anchorage failures are summarized. Based on an excavation case history, a numerical investigation is conducted using a PLAXIS-based finite element method to reveal the crucial mechanical behaviors of the retaining structure and soil layers as a result of different types of anchorage failures. According to the simulation results, the responses to anchorage failures are analyzed, and the safety coefficient for the retaining structure is presented. The analysis for this numerical work indicates that dangerous failure positions appear at the top of the pile wall or in the region near the excavation bottom. Then, a three-dimensional numerical model is established to analyze the mechanical behaviors and the influence scopes of the retaining structure caused by individual anchor failures. Special emphasis is placed on the analysis of the bending moments and horizontal displacements in the wall, as well as on the prestress and internal forces in each of the row anchors, displacements, and plastic strains in the ground and stabilities of the deep excavation. Conclusions obtained from the numerical study can provide guidelines for good practices in the construction of anchored pile wall-retained excavations in sandy soil.
Highlights
The construction of high-rise buildings in urban districts employs deep excavations frequently to overcome the problems of settlement and bearing capacity.[1]
This study provides information that is useful in the design and construction of deep excavations supported by anchored pile walls
The mechanical responses of deep excavation to partial anchorage failure were studied by a series of numerical investigations based on a case history of tieback anchored pile wall supported deep excavation
Summary
The construction of high-rise buildings in urban districts employs deep excavations frequently to overcome the problems of settlement and bearing capacity.[1] For deep excavations, a retaining wall with anchored tiebacks is a common technique of support systems that can be constructed using cast-in-place or precast bored piles, sheet piles, or diaphragm walls.[2] This technique first appeared in the 1950s3 and has been developed and used in the past 70 years for deep excavations and for embankment reinforcement, slope stabilization, seismic retrofit, and port constructions.[4,5,6] A tieback anchor system offers significant economic and time advantages during the excavation of a large area.[7] despite an increasing number of tieback anchors being used in geotechnical engineering, the issues regarding the long-term reliability and performance of anchors have not been resolved.[8] Due to construction quality, design
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