Jiang Xiangming, Zheng Guosheng, Sui Wanghua, Chen Jiaxing, Zhang Jinchuan
School of Resources and Geosciences, Institute of Mine Water Hazards Prevention and Controlling Technology, China University of Mining and Technology, Xuzhou 221116, China.
Shandong Provincial Communications Planning and Design Institute Co., Ltd., 576 Wuyingshan West Road, Jinan 250031, China.
ACS Omega. 2021 Feb 11;6(7):4672-4679. doi: 10.1021/acsomega.0c05393. eCollection 2021 Feb 23.
This paper presents an experimental investigation on the propagation of chemical grouting in a two-dimensional permeated fracture network with various aperture widths. As grouting engineering is often concealed in most experiments, the propagation of grout in fractures is not fully understood. The anisotropic permeability of geological masses with different aperture widths was found and has been investigated since 1960. The deflection flow effect was first found by Tian for groundwater flow in two groups of fractures with different aperture widths. Field grouting indicated that the grout propagates along a group of fractures with larger apertures that are longer while propagating a shorter distance along fractures with small apertures. This phenomenon implies a deflection for grout propagation in fractures with different aperture widths. The results of our study confirm this and indicate that there would be an anisotropy of grout propagation when the two groups of aperture widths are different. The water flow conditions also cause the difference in grout propagation length. When the aperture widths of the two groups of fractures are the same, the propagation shows symmetrical ellipse propagation. The results show the anisotropy of the grout increases as the aperture width ratio increases. This study helps in understanding the mechanism of chemical grouting in fractures with different apertures and flowing water and outlines some implications for grouting design in a fractured rock mass.
本文针对化学浆液在具有不同孔径宽度的二维渗透裂隙网络中的扩散进行了实验研究。由于在大多数实验中注浆工程往往具有隐蔽性，因此浆液在裂隙中的扩散情况尚未得到充分了解。自1960年以来，人们发现并研究了具有不同孔径宽度的地质体的各向异性渗透率。田首次发现了两组不同孔径宽度裂隙中地下水流动的偏流效应。现场注浆表明，浆液沿着一组孔径较大且较长的裂隙扩散，而沿着孔径较小的裂隙扩散距离较短。这种现象意味着浆液在不同孔径宽度的裂隙中扩散时会发生偏折。我们的研究结果证实了这一点，并表明当两组孔径宽度不同时，浆液扩散会存在各向异性。水流条件也会导致浆液扩散长度的差异。当两组裂隙的孔径宽度相同时，扩散呈现对称椭圆状。结果表明，随着孔径宽度比的增加，浆液的各向异性增强。本研究有助于理解化学浆液在不同孔径且有水流的裂隙中的扩散机理，并概述了对裂隙岩体注浆设计的一些启示。
