Influence of type of drainage boundary on coefficient of horizontal consolidation

IF 1.3 Q3 ENGINEERING, GEOLOGICAL
G. Sridhar, R. Robinson, K. Rajagopal
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引用次数: 0

Abstract

Vertical drains are used widely to accelerate the consolidation of soft clay deposits when preloading is used as a ground improvement technique. One of the essential input parameters required in Barron's theory is the coefficient of horizontal consolidation, ch. The values of ch can be determined by the radial consolidation test, using either a central sand drain or a porous plastic peripheral drain. This paper presents the laboratory tests carried out to understand the reason for the difference in values of ch determined from inward and outward radial flow consolidations tests. A 150 mm diameter instrumented consolidation cell was used to perform the inward or outward radial consolidation tests. The total stress measurements during consolidation showed non-uniform stress distribution in clay with higher effective stress values close to the drainage boundary. This stiffening of the clay close to the drain retards the consolidation rate resulting in reduced values of ch. As a result, the ch values determined by radially outward consolidation tests with larger drainage boundary area are lower to those obtained by the inward radial flow test. The pore water pressure measurements showed significantly higher undissipated pore water pressure away from the drainage boundary for the outward flow test.
排水边界类型对水平固结系数的影响
在采用预压地基加固技术时,垂直排水管被广泛用于加速软粘土沉积的固结。巴伦理论要求的一个重要输入参数是水平固结系数ch。ch的值可以通过径向固结试验确定,使用中心砂土排水或多孔塑料外围排水。本文介绍了为了解从向内和向外径向流固结试验中测定的ch值不同的原因而进行的实验室试验。采用直径150mm的仪器固结箱进行向内或向外径向固结试验。固结过程中总应力测量结果表明,粘土中应力分布不均匀,靠近排水边界处有效应力值较高。靠近排水口的粘土的这种硬化延缓了固结速率,导致ch值降低。因此,在较大的排水边界面积下,径向向外固结试验得到的ch值低于向内径向流动试验得到的ch值。孔隙水压力测量表明,在远离排水边界的地方,向外流动试验的未耗散孔隙水压力明显更高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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