利用考虑原位应力状态的重复加载 CBR 试验估算路基弹性模量的实验和数值模型表述

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
Supratim Kaushik , Suman Kumar , Anjan Kumar Siddagangaiah
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引用次数: 0

摘要

用回弹模量表征路基是柔性路面设计的一个重要方面。本文提出了一种方法和预测模型,利用简单的重复加载 CBR(RLCBR)试验估算回弹模量,更好地考虑了路基土的原位应力状态。对三种含水量下的八种路基土进行了 RLCBR 试验。通过在商用软件包 LS-DYNA® 中模拟 CBR 试验进行了数值研究,以了解柱塞加载下与现场条件相关的应力状态。在实验室 RLCBR 试验和有限元模型的基础上,考虑到路基土在现场所经历的应力状态,提出了一种新的路基土表征模型。利用其他四种土壤的数据对提出的模型进行了验证,结果表明两者吻合良好。与之前开发的模型相比,该研究模型对低塑性路基土的预测能力更强。实践工程师可以利用所开发的模型估算路基在推荐应力状态下的弹性模量,以进行路面机械设计,同时了解土壤的荷载-变形行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and numerical based model formulation for estimation of subgrade resilient modulus using the repeated load CBR test considering in situ state of stress

Characterizing subgrade in terms of resilient modulus is a crucial aspect of flexible pavement design. This paper proposes a methodology and predictive model to estimate the resilient modulus with better consideration of subgrade soils’ in situ stress state using a simple Repeated Load CBR (RLCBR) test. RLCBR tests were conducted on eight subgrade soils at three moisture contents. Numerical studies were conducted by simulating the CBR test in the commercial package LS-DYNA® to understand the stress state under plunger loading concerning field conditions. A new model was proposed for the characterization of subgrade soils based on laboratory RLCBR tests and the FEM, considering the stress state experienced by subgrade soils in the field. The proposed model was validated using data from four other soils and showed good agreement. The study model showed a better predictive capacity for the low plastic subgrade soils than previously developed models. Practicing engineers can use the developed model for estimating the subgrade resilient modulus at the recommended stress state for mechanistic pavement design while understanding the soil’s load-deformation behavior.

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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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