Wang Lina, Yang Xiaodong, Diao Yueliang, Guo Chengchao
School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
Hefei Commumications Investment Hetong Expressway Co., Ltd., Hefei 231200, China.
Polymers (Basel). 2024 Aug 2;16(15):2207. doi: 10.3390/polym16152207.
The issue of interfacial shear damage has been a significant challenge in the field of geotechnical engineering, particularly in the context of diaphragm walls and surrounding soils. Polymer grouting is a more commonly used repair and reinforcement method but its application to interface repair and reinforcement in the field of geotechnical engineering is still relatively rare. Consequently, this paper presents a new polymer grouting material for use in grouting reinforcement at the interface between concrete and soils. The bonding characteristics and shear damage mode of the interface after grouting were investigated by the direct shear test, and the whole process of interface shear damage was investigated by digital image correlation (DIC) technology. Finally, the reinforcement mechanism was analyzed by microscopic analysis. The results demonstrate that the permeable polymer is capable of effectively filling the pores of soil particles and penetrating into the concrete-soil interface. Through a chemical reaction with water in the soil, the polymer cements the soil particles together, forming chemical adhesion at the interface and thereby achieving the desired reinforcement and repair effect. In the shear process, as the normal stress increased, the horizontal displacement and horizontal compressive strain at the distal end of the loading end decreased, while the maximum vertical displacement and maximum vertical strain of the cured soil also decreased. The results of scanning electron microscopy (SEM) demonstrated that the four groups of test polymers exhibited a reduction in soil porosity of 53.47%, 58.79%, 52.71%, and 54.12%, respectively. Additionally, the form of concrete-soil interfacial bonding was observed in the concrete-cohesive layer-cured soil mode. The findings of this study provide a foundation for further research on diaphragm wall repair and reinforcement.
界面剪切破坏问题一直是岩土工程领域的一项重大挑战，尤其是在地下连续墙与周边土体的背景下。聚合物注浆是一种较为常用的修复与加固方法，但其在岩土工程领域的界面修复与加固应用仍相对较少。因此，本文提出一种新型聚合物注浆材料，用于混凝土与土体界面的注浆加固。通过直接剪切试验研究了注浆后界面的粘结特性和剪切破坏模式，并采用数字图像相关（DIC）技术研究了界面剪切破坏的全过程。最后，通过微观分析对加固机理进行了分析。结果表明，渗透性聚合物能够有效填充土颗粒孔隙并渗透到混凝土 - 土体界面。通过与土体中的水发生化学反应，聚合物将土颗粒粘结在一起，在界面处形成化学粘结，从而达到预期的加固和修复效果。在剪切过程中，随着法向应力的增加，加载端远端的水平位移和水平压缩应变减小，固化土的最大垂直位移和最大垂直应变也减小。扫描电子显微镜（SEM）结果表明，四组试验聚合物的土体孔隙率分别降低了53.47%、58.79%、52.71%和54.12%。此外，在混凝土 - 粘结层 - 固化土模式中观察到了混凝土 - 土体界面粘结的形式。本研究结果为地下连续墙修复与加固的进一步研究提供了基础。
