用预制垂直排水沟处理砂试样的液化和再液化缓解:实验研究

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-10-08 DOI:10.1016/j.geotexmem.2024.09.018
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引用次数: 0

摘要

本研究考察了预制垂直排水沟(PVD)抗液化和再液化的性能。使用 1g 振动台仪器对未处理和已处理的相对密度为 25% 的砂试样进行了 102 次系列振动。用三种不同的重复振动模式和两种不同频率(2 Hz 和 3.5 Hz)、持续时间为 1 分钟的独立事件进行了正弦波形试验。试验了两种不同的安装方法:单独排水法(PVD-D)和排水与致密化法(PVD-DD)。通过土工织物拉伸试验设备和数字图像相关性检验了 PVD 的耐久性。这些实验表明,PVD 过滤器即使在反复震动的情况下也具有出色的耐久性能。由于 PVD 提供的径向排水功能延缓了过剩孔隙压力(EPP)的产生,经过处理的试样提高了抗再塌陷能力。此外,在安装 PVD 过程中引起的致密化也有助于限制 EPP,但是,在反复摇晃过程中引起的砂致密化并不是提高抗液化/再液化能力的原因。结果表明,即使未经处理的试样完全液化或产生接近于 1 的最大值,经过处理的试样的最大孔隙压力比在大多数事件中也被限制在阈值设计限值(≤0.60)之内。
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Liquefaction and reliquefaction mitigation of sand specimen treated with prefabricated vertical drains: An experimental investigation
This study examines the performance of prefabricated vertical drains (PVD) against liquefaction and reliquefaction. A series of 102 shakings were performed using 1g shaking table apparatus on untreated and treated sand specimens prepared with 25% relative density. Sinusoidal waveform experimented with three different repeated shaking patterns and independent events for two different frequencies (2 Hz and 3.5 Hz) with 1-min duration. Two different installation methods; drainage alone method (PVD-D) and drainage along with densification (PVD-DD) were experimented. Durability of PVD were examined from geotextile tensile testing apparatus and digital image correlation. These experiments demonstrated excellent durability characteristics of PVD filter even after exposed to repeated shakings. Treated specimens improved the resistance to reliquefaction due to radial drainage offered by PVD which has retarded the excess pore pressure (EPP) generation. In addition, densification induced during the installation of PVD also contributed for restricting EPP, however, the induced sand densification achieved during repeated shaking events were not responsible for increased resistance against liquefaction/reliquefaction. Results indicate that the maximum pore pressure ratio in treated specimens were restricted within threshold design limit (≤0.60) for most of the events, even when the untreated specimens completely liquefied or generated a maximum value near unity.
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
期刊最新文献
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