Evaluating improved moduli of geogrid-stabilised sandy soil with a deflectometer

IF 1.3 Q3 ENGINEERING, GEOLOGICAL
Sidhu Ramulu Duddu, Vamsi Kommanamanchi, Hariprasad Chennarapu, U. Balunaini
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引用次数: 0

Abstract

Geogrid-stabilised soil has been widely adopted to enhance performance in transportation and infrastructure sectors. In a study, the performance of unstabilised and triaxial-geogrid-stabilised sandy soils in terms of dynamic deformation modulus and elastic modulus was measured using lightweight deflectometer test and plate load tests respectively. The objective of the study was to evaluate: (a) determination of dynamic deformation modulus of sandy soils with different relative compactions from deflectometer testing and compare with the elastic modulus of sandy soils from plate load tests for a given relative compaction of 97%; (b) determination of modulus improvement factors of triaxial-geogrid-stabilised sandy soils through extensive laboratory testing; and (c) demonstration of compaction quality control of well-graded gravel using deflectometer testing through a field study. The triaxial-geogrid-stabilised sandy soil layer showed modulus improvement factors of 1.51 and 1.37 obtained from deflectometer and plate tests corresponding to an embedded depth of 50 mm respectively. The percentage differences in these values are in the range of 4% to 9% for all the embedded depths. Hence a lightweight deflectometer can be used instead of a plate load test as a quick and low-cost alternative for determining the modulus improvement factor of geogrid-stabilised sand soil, both in the laboratory and in the field.
用偏转计评价土工格栅稳定砂土的改进模量
土工格栅稳定土已被广泛采用,以提高交通和基础设施部门的性能。在一项研究中,不稳定和三轴土工格栅稳定的沙土在动态变形模量和弹性模量方面的性能分别采用轻型偏转仪试验和板荷载试验进行了测量。本研究的目的是评估:(a)从偏转计测试中确定不同相对压实度的沙土的动态变形模量,并与给定相对压实度为97%的板载试验中沙土的弹性模量进行比较;(b)通过广泛的实验室测试,确定三轴土工格栅稳定砂质土的模量改善系数;(c)通过现场试验,论证了用偏转仪对分级良好的砾石进行压实质量控制。三轴土工格栅稳定沙土层的模量改善系数分别为1.51和1.37,分别对应于埋深为50 mm的偏转仪和板试验。对于所有嵌入深度,这些值的百分比差异在4%到9%之间。因此,无论是在实验室还是在现场,轻质挠度计都可以代替板荷载测试,作为确定土工格栅稳定砂土的模量改善系数的快速和低成本替代方案。
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来源期刊
CiteScore
3.10
自引率
8.30%
发文量
54
期刊介绍: Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.
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