考虑宏细观耦合损伤的注浆加固体渗流-蠕变本构模型及试验验证

Seepage-creep constitutive model and experimental verification of grouted rock mass considering macro-meso coupling damage effect

水利工程中蠕变效应的存在导致了工程在运营过程中频繁发生灾害,造成了严重的损失,因此成为影响水利工程长期稳定性的主要因素之一.为了有效地应对可能带来的工程灾害,注浆技术被广泛应用以延长水利工程的运营寿命.本文基于宏观-细观缺陷耦合的思想,建立了注浆加固后岩体的渗流-蠕变本构模型,然后利用ROCK岩石多场耦合试验系统进行了渗流-蠕变试验,揭示了不同注浆材料对裂隙岩体加固特性的影响规律,并对建立的渗流-蠕变本构模型进行了验证.研究结果表明:建立的宏观-细观耦合损伤蠕变模型能够综合考虑裂隙几何参数特性、力学参数特性和注浆加固效果等因素对蠕变的影响.同时,该模型从动态的角度考虑了渗流-蠕变过程中力学参数的变化以及渗透水压的影响,相较于传统西原模型具有明显优势.试验获得了含聚丙烯纤维PO42.5混凝土和硅溶胶加固后岩体的蠕变特性以及渗透性能的变化规律,同时证明了渗流-蠕变本构模型的准确性和有效性.这些研究成果为水利工程的注浆加固设计提供了理论依据.

The existence of creep effects in hydraulic engineering has led to frequent occurrences of disasters during the operation of projects,resulting in serious losses,thus becoming one of the main factors affecting the long-term stability of hydraulic engineering.In order to effectively deal with potential engineering disasters,grouting technology is widely applied to extend the service life of hydraulic engineering.In this research,based on the concept of macro-micro defect coupling,a seepage-creep constitutive model of the rock mass reinforced by grouting was established.Subsequently,seepage-creep tests were conducted using the ROCK multi-field coupling test system,revealing the influence of different grouting materials on the reinforcement characteristics of fractured rock masses,and validating the established seepagecreep constitutive model.The research results indicate that the established macro-micro coupling damage creep model can comprehensively consider the influence of factors such as fracture geometric parameters,mechanical parameters,and grouting reinforcement effects on creep.Meanwhile,the new constitutive model dynamically considers the changes in mechanical parameters and the influence of permeating water pressure during the seepage-creep process,exhibiting significant advantages over the traditional Xiyuan model.The experiments obtained the change laws of creep characteristics and permeability performance of rock masses reinforced with PO42.5concrete containing polypropylene fibers and silica sol,simultaneously proving the accuracy and effectiveness of the seepage-creep constitutive model.These research findings provide a theoretical basis for the design of grouting reinforcement in hydraulic engineering.