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Study on the Influence of Compaction Degree and Wall-Soil Friction Angle in TT Mode on the Active Failure Mechanism of Finite Soil Mass.

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Title: Study on the Influence of Compaction Degree and Wall-Soil Friction Angle in TT Mode on the Active Failure Mechanism of Finite Soil Mass.
Authors: Liu, Sanxian1 330224270@qq.com, Zeng, Yongqing2 yqzeng@hnist.edu.cn, Liu, Zhengfu3 597073225@qq.com, Long, Zuhui1 86073641@qq.com, Yin, Qiang1 313910030@qq.com, Lan, Hongyu1 373800740@qq.com, Liu, Xiaohong2 11991491@hnist.edu.cn
Source: Engineering Letters. May2026, Vol. 34 Issue 5, p1568-1578. 11p.
Subjects: Soil compaction, Earth pressure, Soil structure, Deformations (Mechanics)
Abstract: The failure mode of a finite soil mass is a key factor in calculating earth pressure. Through model tests and numerical simulations, this paper explores the influence of the compaction degree and wall-soil friction angle on the characteristics of active failure sliding surface and the law of earth pressure in the TT mode for finite soil mass. The research results show: (1) When the width-to-height ratio n=0.2, the active sliding surface is composed of 2 to 4 segments broken lines or 1 line segment. (2) By introducing the definition on "length factor" of the sliding surface, the length factor is fitted with the compaction degree, and the length factor is fitted with the wall-soil friction angle; the fitting formulas both show a highly linear correlation; the length factor is jointly studied with compaction degree and wall-soil friction angle to obtain a binary quadratic function, and the fitting formula shows a high correlation. (3) When the wall-soil friction angle δ≤0.4φ, the variation in the sliding surface geometry and earth pressure distribution remains minimal, and it can be assumed to be a smooth retaining wall. (4) As both the compaction degree and the wall-earth friction angle increase, the magnitude of earth pressure decreases correspondingly. These research findings provide foundational data for the theoretical development of active deformation and earth pressure analysis in finite soil, offering theoretical value and practical significance. [ABSTRACT FROM AUTHOR]
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Abstract:The failure mode of a finite soil mass is a key factor in calculating earth pressure. Through model tests and numerical simulations, this paper explores the influence of the compaction degree and wall-soil friction angle on the characteristics of active failure sliding surface and the law of earth pressure in the TT mode for finite soil mass. The research results show: (1) When the width-to-height ratio n=0.2, the active sliding surface is composed of 2 to 4 segments broken lines or 1 line segment. (2) By introducing the definition on "length factor" of the sliding surface, the length factor is fitted with the compaction degree, and the length factor is fitted with the wall-soil friction angle; the fitting formulas both show a highly linear correlation; the length factor is jointly studied with compaction degree and wall-soil friction angle to obtain a binary quadratic function, and the fitting formula shows a high correlation. (3) When the wall-soil friction angle δ≤0.4φ, the variation in the sliding surface geometry and earth pressure distribution remains minimal, and it can be assumed to be a smooth retaining wall. (4) As both the compaction degree and the wall-earth friction angle increase, the magnitude of earth pressure decreases correspondingly. These research findings provide foundational data for the theoretical development of active deformation and earth pressure analysis in finite soil, offering theoretical value and practical significance. [ABSTRACT FROM AUTHOR]
ISSN:1816093X