轻质膨胀粘土集料筏加固软土基础承载力研究

IF 3.1 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Ir. Dr. Azhani Zukri
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引用次数: 0

摘要

本研究以轻膨胀粘土骨料(LECA)代替普通骨料填料,对地基荷载作用下提高软粘土承载力的替代方法的有效性进行了研究。与安装木筏基础或使用诸如桩之类的深基础相比,土壤置换技术是改善软土的最简单和最便宜的方法。LECA以轻、强、环保而闻名,被广泛应用于岩土工程中,其中重量是一个问题。采用商用软件PLAXIS 3D(2020)对LECA加固软土地基基础的承载力进行有限元分析。软土地基采用硬化土(HS)本构模型,而软土地基采用莫尔-库仑(MC)本构模型。通过参数化研究,评价了不同摩擦角下LECA筏板厚度对承载力提高的影响。研究发现,承载力与LECA内摩擦角和LECA筏板厚度成正比。然而,当使用2.5 m和3.5 m厚的LECA筏板时,承载力几乎呈线性关系,说明置换深度大于25%对改善率的影响不显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bearing Capacity of Footing on Soft Clay Strengthened by Lightweight Expanded Clay Aggregate Raft
This research represents an investigation into the effectiveness of replacement methods to increase the bearing capacity of soft clays under footing load, where Light Expanded Clay aggregates (LECA) were used as a substitute for common aggregate fillers. The soil replacement technique is the easiest and cheapest way to improve soft soil compared to installing a raft footing or using a deep foundation such as piles. LECA is known to be light, strong and environmentally sustainable and is widely used in Geotechnical applications where weight is an issue. The bearing capacity of the footing on soft soil reinforced by LECA was analysed through finite element analysis using commercial software PLAXIS 3D (2020). The soft ground is represented by Hardening Soil (HS) constitutive model, while LECA has been modelled as Mohr-Coulomb (MC). Parametric studies were conducted to assess the effect of LECA raft thickness to bearing capacity improvement for various friction angles of LECA. The research found that the bearing capacity is directly proportional to the internal friction angle of LECA and the LECA raft thickness. Nevertheless, the bearing capacity appears to be almost linear when 2.5 m and 3.5 m thick LECA rafts are used, indicating that the depth of replacement ratio more than 25% give insignificant effect towards improvement ratio.
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来源期刊
Construction Innovation-England
Construction Innovation-England CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
7.10
自引率
12.10%
发文量
71
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