文献类型：期刊文献

英文题名：Mechanical properties of monolithic EPS-coated lightweight soil: unconfined compressive strength and small-strain dynamic characterization

作者：Jiang, Ping[1,2]; Wu, Xinghan[1,2]; Wang, Wei[1,2]; Li, Na[1,2]; Zhan, Haihua[3]; Mei, Guoxiong[4]; Wang, Jianfeng[5]

机构：[1] School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China; [2] Shaoxing Key Laboratory of Interaction between Soft Soil Foundation and Building Structure, Shaoxing, 312000, China; [3] School of Textile Science and Engineering, Shaoxing University, Shaoxing, 312000, China; [4] Ocean College, Zhejiang University, Zhejiang, Zhoushan, 316021, China; [5] Tongchuang Engineering Design Co., Ltd, Shaoxing, 312000, China

年份：2025

卷号：199

外文期刊名：Soil Dynamics and Earthquake Engineering

收录：EI(收录号：20252918808217)、Scopus(收录号：2-s2.0-105010848670)

语种：英文

外文关键词：Damping - Dynamics - Elastic moduli - Growth rate - Settlement of structures - Shear flow - Shear strain - Slope stability - Soil testing - Soils - Strain measurement - Strain rate

外文摘要：Expanded polystyrene (EPS) foam lightweight soil, a novel lightweight geomaterial, offers significant advantages in addressing the challenges of soft ground settlement and slope instability. To address the issue of inconsistent EPS particle distribution, this study presents a new material called monolithic EPS-coated lightweight soil (MECS) structure. The static strength characteristics and small strain dynamic response characteristics of MECS were investigated by conducting unconfined compressive strength tests and resonant column tests. The results show that (1) MECS exhibits a typical shear damage mode under uniaxial compression conditions, and its unconfined compressive strength (qs) is inversely proportional to the thickness (T) of the EPS sleeve. (2) In the small strain range, the dynamic shear modulus (G) of MECS decreases with increasing T, but increases with increasing confining pressure (P). The dynamic shear modulus-dynamic shear strain curve (G - γc) exhibits clear decay characteristics, with an accelerated decay when γc > 10-3 (T influence) and γc > 10-4 (P influence). (3) A relationship connecting qs and the initial dynamic shear modulus (G0) has been formulated. By modifying the Hardin-Drnevich model, it becomes possible to accurately predict the normalized dynamic shear modulus decay curve for MECS in the small strain range. This curve exhibits a typical inverse "S" shape distribution characteristic. (4) The damping ratio (D) of MECS is positively associated with the T and negatively linked to the P. The damping ratio - dynamic shear strain curve (D - γc) shows a growing trend, and the growth rate increases with the increase of γc. The maximum damping ratio (Dmax) shows an "S" shape growth with the increase of T, and a "C" shape decrease with the increase of P. Research shows that Romo's empirical formula precisely captures the damping characteristics of MECS and offers a dependable approach for quantitatively analyzing the D within the small strain scope. The research furnishes a critical theoretical groundwork and technical assistance for the wide application of MECS in soft soil foundation construction. ? 2025 Elsevier Ltd