真空固结对前特斯科科湖异常软粘土水力学性质的影响

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-12-23 DOI:10.1016/j.sandf.2023.101410
Norma Patricia López-Acosta, Alejandra Liliana Espinosa-Santiago
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引用次数: 0

摘要

墨西哥前特斯科科湖地区的特点是含水量高、可压缩性强的软质湖积粘土地层。计划在该地区修建一个新机场,这就需要对土壤进行稳定处理。土壤改良方案之一是使用真空预加载系统,通过垂直排水沟向土壤施加真空。本研究评估了两种真空技术的实施对水力学特性的改善。2016 年,我们建造了两个带有附加预压和垂直排水沟的试验路堤,一个路堤采用排水沟-排水沟技术,另一个路堤采用气密膜技术。在试验路堤中应用六个月的平均真空压力分别为-58 千帕和-63 千帕,采用的是排水沟对排水沟技术和气密膜技术。两种技术对特性的改善程度各不相同。气密膜技术将含水量和空隙率分别降低了 50% 和 46%。而从排水沟到排水沟技术则将含水率和空隙率分别降低了 15% 和 13%。在两个试验路堤的中心位置,使用不同的观察方法估算出的固结度介于 86 % 到 88 % 之间。
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Vacuum consolidation effect on the hydromechanical properties of the unusual soft clays of the former Texcoco Lake

The area of the former Texcoco Lake in Mexico is characterized by soft lacustrine clay strata with high water content and high compressibility. The construction of a new airport was planned in this area, which requires soil stabilization. One soil improvement option is the use of vacuum preloading systems that apply a vacuum to the soil through vertical drains. This study evaluates the improvement on hydromechanical properties resulting from the implementation of two vacuum techniques. In 2016, two test embankments with surcharge preloading and vertical drains were constructed to apply a vacuum using the drain-to-drain technique in one embankment and the airtight membrane technique in the other. The average vacuum pressures applied for six months in the test embankments were −58 kPa and −63 kPa with the drain-to-drain and airtight membrane techniques, respectively. The improvement on the properties varied between the two techniques. The airtight membrane technique reduced the water content and the void ratio up to 50 % and 46 %, respectively. While the drain-to-drain technique reduced the water content and the void ratio up to 15 % and 13 %, respectively. The degree of consolidation estimated using different observational methods at the center of both test embankments ranged from 86 % to 88 %.

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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
期刊最新文献
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