Permeation grouting in soils: numerical discussion of the reliability of a simplifying analytical approach

IF 1.3 Q3 ENGINEERING, GEOLOGICAL
K. Boschi, D. Grassi, R. Castellanza, C. G. di Prisco
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引用次数: 1

Abstract

Permeation grouting, i.e. injections at low pressure values of either microfine cements or chemical products, is frequently adopted to increase the mechanical/hydraulic properties of soils and standard design approaches are currently either empirical or based on simplified analytical solutions. In this paper, some fundamental hypotheses of these analytical solutions are discussed by performing a campaign of finite element numerical analyses, in which the injection phase in a water saturated soil is analysed, a Newtonian rheology for the grout is implemented and the hypothesis of immiscibility for the two liquids is assumed. The injection source geometry effect is discussed, as well as the role of gravity and capillarity. The authors analyse the conditions, in terms of injection flow rate, grout viscosity, soil intrinsic permeability and retention curve, under which the analytical solutions provide reliable results. The numerical results have been compared with the simplified analytical solution herein derived for a 1D spherical geometry, in terms of the “characteristic curves” for the system: the relationship between injection pressure/grout front advancement and injection time.
土中渗透注浆:一种简化解析方法可靠性的数值讨论
渗透注浆,即在低压值注入微细水泥或化学产品,经常被用来增加土壤的力学/水力特性,目前的标准设计方法要么是经验的,要么是基于简化的解析解。本文通过进行一系列有限元数值分析,讨论了这些解析解的一些基本假设,其中分析了饱和水土壤中的注入阶段,实现了浆液的牛顿流变性,并假设了两种液体的不混相。讨论了注入源的几何效应,以及重力和毛细作用。从注浆流量、浆液黏度、土体固有渗透性和截留曲线等方面对不同条件进行了分析,得到了可靠的结果。数值计算结果与一维球面几何简化解析解进行了比较,得到了注浆压力/注浆前缘推进与注浆时间之间的特征曲线。
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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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