分类： 矿山工程技术 >> 矿山地质学 提交时间： 2025-07-17
摘要： Grouting serves as an effective method for mitigating geotechnical disasters in subsea tunnels. However, current theories and designs, primarily based on terrestrial tunnel contexts, seldom address the long-term effects of seawater ion erosion on reinforcement. An improved sand permeation grouting simulation test system was employed to examine the mechanical property evolution of sand layer grouting reinforcement under seawater erosion, utilizing various grout types. The mechanical properties of grouting reinforcement, under varying curing conditions, were analyzed using uniaxial compression test, permeability test, and scanning electron microscope (SEM) test. Test results indicate that seawater curing conditions initially enhance the strength and impermeability of grouting reinforcement; however, prolonged curing diminishes these mechanical benefits. The onset of this process occurs significantly sooner in cement-sodium silicate grout (28d to 56d) compared to cement grout (56d to 90d). For cement grouting reinforcement, the deformation modulus increases over time, albeit at a decreasing rate. The deformation modulus of cement-sodium silicate grouting reinforcement follows an increase-decrease-increase pattern, correlating with the volume ratio over time. The decline in mechanical properties of grouting reinforcement during the test's mid to late stages under seawater conditions results from the interplay between erosive ions, which inhibit mechanical growth and accelerate deterioration.
分类： 矿山工程技术 >> 矿山地质学 提交时间： 2025-07-17
摘要： Grouting is a common technical measure to improve the mechanical properties of broken rock mass and ensure the stability of underground excavation. The strength characteristics of reinforced broken rock mass are important parameters in geotechnical engineering design. However, due to the complex structure of broken rock mass, the strength characteristics of reinforced broken rock mass are influenced by various factors, making quantitative studies of its strength extremely complex. To establish a reasonable approach for predicting the compressive strength of reinforced broken rock mass, this paper examines how various properties of broken rock mass (i.e., strength, volumetric block proportion, degree of fragmentation, shape, and angle) and the characteristics of cement stone body (i.e., cement stone body strength and interface strength) influence the reinforcement strength, and quantifies these effects. It reveals the mechanisms by which these factors influence the reinforcement strength. Considering factors such as rock shape, orientation, and intrinsic angle, a dimensionless quantitative method to describe rock structure is proposed. On this basis, a prediction model for the compressive strength of reinforced broken rock mass is established by comprehensively considering the properties of both the broken rock mass and the grout stone body. The prediction equation is validated using data from the literature, confirming the accuracy of the prediction model. The research findings provide a valuable reference for refining the reinforcement theory of broken rock mass.
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