评价各向异性和风化对印度喜马偕尔邦片麻岩强度行为的综合影响：来自化学风化指标的启示

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology Pub Date : 2025-04-21 DOI:10.1016/j.enggeo.2025.108086

Honey Kaushal, Aditya Singh, Narendra Kumar Samadhiya

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引用次数: 0

摘要

本文研究了各向异性叶理作用和风化作用对印度喜马偕尔邦Kullu三种风化喜马拉雅片麻岩（新鲜、轻度和中度风化）强度和变形特征的综合影响。该研究的新颖之处在于，它将风化片麻岩的三轴强度与合适的化学风化指标（斜长石蚀变指数（PIA）、风化化学指数（CIW）和燃失（LOI））联系起来。该研究报告了大量实验工作的结果，包括单轴、三轴压缩、巴西拉伸和点载荷强度测试，测试对象是风化片麻岩的三个等级，分布在五个不同的各向异性叶理（0°、30°、45°、60°和90°）上。观察结果表明，各向异性的片理作用和风化作用影响了非约束和约束条件下片麻岩的强度。风化作用降低了片麻岩的单轴、巴西抗拉强度和三轴强度。在单轴和三轴两种状态下，各级风化片麻岩均表现出u型强度各向异性曲线。三轴强度与相应的化学风化指标呈线性关系。这些关系有助于利用粉末XRF数据获得各向异性岩石在不同各向异性角度下的强度。粉末XRF测试相对容易执行，因为样品制备没有物理尺寸限制。在没有L/D比为2的完美岩心（试样）所需数量的情况下，相关性可以用于岩石工程项目的近似强度评估。基于这些关系，本研究确定了适合的修正Hoek-Brown各向异性岩石破坏判据，该判据在考虑风化作用的基础上，采用适当的化学风化指标对喜马拉雅片麻岩进行了修正。修正的决定系数（R2）为0.93。

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Evaluating the combined influence of anisotropy and weathering on strength behavior of gneissic rocks in Himachal Pradesh, India: Insights from chemical weathering indices

The present study examines the combined effect of anisotropic foliations and weathering on the strength and deformation characteristics of the three grades of weathered Himalayan gneiss (fresh, slightly, and moderately weathered) from Kullu, Himachal Pradesh, India. The study's novelty is that it links the triaxial strength of weathered gneiss with suitable chemical weathering indices (Plagioclase Index of Alteration (PIA), Chemical Index of Weathering (CIW), and Loss of Ignition (LOI)). The study reports the output of extensive experimental work containing uniaxial, triaxial compression, Brazilian tensile, and point load strength testing on three grades of weathered gneiss at five different anisotropic foliations (0°, 30°, 45°, 60°, and 90°). The observations report that anisotropic foliations and weathering affect the strength of gneissic rocks under unconfined and confined conditions. The weathering decreases gneissic rock's uniaxial, Brazilian tensile, and triaxial strengths. The U-shaped strength anisotropy curve is noticed in all grades of weathered gneiss under both uniaxial and triaxial states. The linear relations were observed between the triaxial strength and appropriate indices of chemical weathering. These relations help to obtain the strength of the anisotropic rock at different anisotropy angles using data from powder XRF. The powder XRF tests are relatively easier to execute as sample preparations have no physical dimensions restrictions. In the absence of the required number of perfect cores (specimens) of L/D ratio two, the correlations enable approximate strength assessment for rock engineering projects. Owing to these relationships, the study identifies the suitable modified Hoek-Brown anisotropic rock failure criterion that is modified to consider the effect of weathering using appropriate indices of chemical weathering for the Himalayan gneiss. The coefficient of determination (R²) was calculated to be 0.93 for the proposed modification.

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来源期刊

Engineering Geology 地学-地球科学综合

CiteScore

13.70

自引率

12.20%

发文量

327

审稿时长

5.6 months

期刊介绍： Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.