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岩石边坡模型试验中水致强度劣化类岩石材料合理配比的试验研究。

Experimental study on the reasonable proportions of rock-like materials for water-induced strength degradation in rock slope model test.

机构信息

Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.

Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China.

出版信息

Sci Rep. 2023 Jun 7;13(1):9288. doi: 10.1038/s41598-023-36511-8.

DOI:10.1038/s41598-023-36511-8
PMID:37286722
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10247748/
Abstract

Water-induced strength deterioration of rock mass is a crucial factor for rock slope instability. To better show the degradation process of rock slope water-rock interaction, we used bentonite as a water-sensitive regulator to build a new rock-like material that matches the features of water-induced strength degradation based on the cement-gypsum bonded materials. Twenty-five schemes of the material mixture proportion were designed using the orthogonal design method considering four factors with five variable levels, and a variety of experiments were conducted to obtain physico-mechanical parameters. In addition, one group of rock-like material proportion was selected and applied to the large-scale physical model test. The experiment results reveal that: (1) The failure mode of this rock-like material is highly similar to that of natural rock masses, and the physico-mechanical parameters vary over a wide range; (2) The bentonite content has a significant influence on the density, elastic modulus, and tensile strength of rock-like materials; (3) It is feasible to obtain the regression equation based on the linear regression analysis to determine the proportion of rock-like material; (4) Through application, the new rock-like material can effectively simulate or reveal the startup mechanism and instability characteristics of rock slopes under water-induced degradation. These studies can serve as a guide for the fabrication of rock-like material in the other model tests.

摘要

水致岩体强度劣化是导致岩质边坡失稳的关键因素。为了更好地展示水岩相互作用过程中边坡强度劣化的演化过程，我们选用膨润土作为敏感性水调制材料，基于水泥-石膏胶结材料设计了一种新型的与水致强度劣化特征相匹配的类岩石材料。考虑到 4 个因素和 5 个变量水平，采用正交设计方法设计了 25 组材料配合比方案，并进行了大量实验以获取物理力学参数。此外，还选择了一组类岩石材料配比并应用于大型物理模型试验。试验结果表明：（1）该类岩石材料的破坏模式与天然岩体高度相似，其物理力学参数变化范围较大；（2）膨润土含量对类岩石材料的密度、弹性模量和抗拉强度有显著影响；（3）通过线性回归分析可以得到基于回归方程的类岩石材料配比确定方法；（4）通过应用，新型类岩石材料可以有效模拟或揭示水致劣化条件下边坡起动机制和失稳特征。这些研究可为其他模型试验中类岩石材料的制作提供指导。

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