安哥拉罗安达湿陷性砂的载荷试验研究

唐国艺; 唐立军; 刘智; 刘争宏; 于永堂; 乔虎

doi:10.16030/j.cnki.issn.1000-3665.2018.05.15

安哥拉罗安达湿陷性砂的载荷试验研究

基金项目:

科技部科技伙伴计划项目资助（KY201502002）；陕西省岩土工程（黄土工程特性研究）“三秦学者岗位”基金项目资助

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出版历程
- 收稿日期: 2018-01-25
- 修回日期: 2018-03-26

Research on collapsible sand under plate load test in Luanda, Angola

TANGGuoyi,

摘要

摘要: 安哥拉罗安达广泛分布的湿陷性砂（Quelo砂），是一种对水十分敏感的特殊砂土，具有浸水后强度降低，并产生湿陷变形的特殊性质，由于缺乏相应的资料和工程经验，其湿陷程度和承载特性是评价的难点。本文通过天然和浸水饱和条件下的载荷试验，实测和研究了罗安达Quelo砂的湿陷变形特点和不同条件下的承载力特征。试验研究结果显示，罗安达Quelo砂是一种湿陷程度为轻微—中等的湿陷性土；Quelo砂的承载力对水分异常敏感，地基土含水率的微小变化即可导致承载力数倍的降低，且饱和后的承载力较小，试验场地浸水饱和后的地基承载力深度修正系数可取1.07。试验表明，在工程实践中考虑地基土含水率变化对地基承载力的影响，不采用消除地基全部湿陷量或部分湿陷量的方法，而将红砂地基当做一般地基进行设计是可行的。
- 罗安达 /
- 湿陷性砂 /
- 承载力 /
- 平板载荷试验 /
- 深层载荷试验
Abstract: The collapsible sand (Quelo sand), which occurs widely in Luanda of Angola, is sensitive to water content with the properties of soften and may causes collapsible deformation during soaking. Due to the lack of relevant data and engineering experience, it is difficult to evaluate the engineering properties of the collapsibility and bearing capacities. In this paper, the characteristics of the collapsible deformation and bearing capacities of Luanda Quelo sand are measured and studied by the plate load test (PLT) under the natural and soaking conditions. The experimental results show that the Quelo sand is a collapsible soil with slight to moderate collapsibility; the bearing capacity of the Quelo sand is sensitive to moisture. With the increasing moisture content of foundation soil, the bearing capacity will be reduced significantly with slight change in moisture and can make the bearing capacity several times lower than before during soaking. If the Quelo sand becomes saturated, the bearing capacity can be revised by the embedment depth with the coefficient of 1.07 in the design of foundation. Thus, the foundation treatment, which according with the ordinary design theory and using the bearing capacity value under the condition of subsoil moisture change, could conform to the requirements while construction without eliminating all collapse or partial collapse of subsoil.
- Luanda /
- collapsible sand /
- bearing capacity /
- the plate load test (PLT) /
- deep PLT

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参考文献(10)

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