Experimental study on mechanical behavior of silty-fine sand reinforced by a new type of permeable polymer material under dry-wet cycles

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
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引用次数: 0

Abstract

Silty-fine sand in the Yellow River floodplain is prone to geological hazards such as collapse, subsidence, gushing water, and sand routing triggered by groundwater seepage. As a new type of grouting material, permeable polymer is effective for solving silty-fine sand geologic hazards. With the rise and fall of the water table, capillary water, and transpiration, the reinforced silty-fine sand will be subjected to dry-wet cycles. Investigating the strength loss mechanism of specimens reinforced with permeable polymer during dry-wet cycles is essential for mitigating silty-fine sand geological hazards. The strength characteristics of permeable polymer grout-reinforced silty-fine sand specimens under dry-wet cycles and its extreme case (long-time immersion) were analyzed from macro and micro perspectives employing unconfined compressive strength (UCS) test and scanning electron microscope (SEM). The functional calculation model between the specimens and the initial grouting conditions under dry-wet cycles was constructed, and the main influencing factors of the UCS loss of the specimens were obtained. After permeable polymer grouting, the porosity of silty-fine sand is reduced effectively and the porous structure is changed. The grouted specimens maintain structural integrity and demonstrate excellent water stability even after dry-wet cycles.
新型渗透性聚合物材料加固的淤泥细砂在干湿循环条件下的力学行为实验研究
黄河冲积平原上的淤泥质细沙容易发生崩塌、沉陷、涌水以及地下水渗漏引发的溃沙等地质灾害。作为一种新型灌浆材料,透水性聚合物可有效解决淤泥质细砂地质灾害问题。随着地下水位的升降、毛细管水和蒸腾作用,加固后的淤泥质细砂将经历干湿循环。研究透水聚合物加固试样在干湿循环过程中的强度损失机理对于减轻淤泥质细砂地质灾害至关重要。本研究采用无压抗压强度(UCS)试验和扫描电子显微镜(SEM),从宏观和微观两个角度分析了透水性聚合物灌浆料加固的淤泥质细砂试样在干湿循环及其极端情况(长时间浸泡)下的强度特性。构建了干湿循环条件下试件与初始灌浆条件之间的函数计算模型,并得出了试件无侧限抗压强度损失的主要影响因素。聚合物渗透灌浆后,淤泥质细砂的孔隙率有效降低,多孔结构发生改变。即使在干湿循环后,灌浆试样仍能保持结构的完整性,并表现出优异的水稳定性。
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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.
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