Field evaluation of moisture-suction regime and modulus of geosynthetic-reinforced soil wall with geo-composite side-drain

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Susit Chaiprakaikeow , Apiniti Jotisankasa , Washirawat Praphatsorn , Avishek Shrestha , Sawek Cheento , Sony Pramusandi , Pragith Chaisri , Shinya Inazumi
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Abstract

Geosynthetic-reinforced soil (GRS) walls built on hillslopes are more increasingly incorporated with geo-composite side drain in order to prevent the side-seepage entering the fill. This study evaluates the long-term moisture, pore-water pressure, and shear modulus, of a 6.5 m-high geogrid-reinforced soil wall in western Thailand. Through extensive field monitoring and in-situ spectral analysis of surface wave (SASW) tests, conducted during the Years 2018–2019, as well as laboratory tests, several key findings emerge. Free-free resonant frequency (FFR) testing of non-reinforced samples reveals the role of soil wetting and drying history and hysteresis in the stiffness-moisture relationship. In-situ pore-water pressure was found to be highest below the road surface near the wall face, decreasing with depth due to underdrainage, with values ranging from −27 to 5 kPa. The intersection of the side drainage board with the underdrain bottom layer shows the highest water content. In-situ and laboratory-derived soil-water retention curve (SWRC) were found to differ at greater depths. In unsaturated conditions, the in-situ small strain modulus of GRS appeared insensitive to suction stress below 10 kPa but was slightly affected under positive pore-water pressure, with multiple linear regression modeling indicating a dependency of stiffness on depth and pore-water pressure.

带土工复合材料侧排水沟的土工合成材料加固土墙的吸湿机制和模量现场评估
在山坡上修建的土工合成材料加固土墙(GRS)越来越多地采用土工复合材料侧排水,以防止侧渗水进入填土。本研究评估了泰国西部一处 6.5 米高的土工格栅加固土墙的长期湿度、孔隙水压力和剪切模量。通过 2018-2019 年期间进行的大量现场监测和原位面波频谱分析(SASW)测试以及实验室测试,得出了几项重要发现。非加固样本的自由共振频率(FFR)测试揭示了土壤干湿历史和滞后在刚度-水分关系中的作用。研究发现,原位孔隙水压力在靠近墙面的路面以下最高,由于排水不足,孔隙水压力随深度的增加而减小,其值在 -27 至 5 kPa 之间。侧排水板与下排水底层的交汇处含水量最高。原位土壤水分滞留曲线(SWRC)和实验室得出的土壤水分滞留曲线(SWRC)在较深的位置有所不同。在非饱和条件下,GRS 的原位小应变模量似乎对低于 10 kPa 的吸应力不敏感,但在正孔隙水压力下会受到轻微影响,多元线性回归模型表明刚度取决于深度和孔隙水压力。
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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.
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