水岩作用下露天矿坑蚀变岩三轴压缩试验分析

本文研究水位升降对边坡稳定的影响。选取莱州仓上露天矿坑边坡蚀变岩样,对不同饱水-失水循环次数的蚀变岩进行了三轴压缩试验。对SγJH粘聚力与循环次数关系、内摩擦角与循环次数关系做了回归分析,考虑到粘聚力受水岩作用影响较大,构建粘聚力与应变软化参数联系方程,描述峰后粘聚力变化。进一步分析饱水-失水溶液成分,讨论饱水-失水循环对蚀变岩力学性质损伤机理。结果表明,随循环次数增加,SγJH内摩擦角呈指数形式减小,粘聚力呈二次多项式形式降低;峰后粘聚力随轴向应变变化规律可用双曲函数描述。关于蚀变岩受水岩作用影响机理,从水物理角度看,SγJH内部的微缺陷进一步发展,导致其力学性质的改变;从水化学角度,SγJ...

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Published in地质与勘探 Vol. 52; no. 3; pp. 564 - 569
Main Author 冯佰研 付厚利 秦哲 牛传星 亓伟林
Format Journal Article
LanguageChinese
Published 2016
Subjects
三轴压缩试验
岩石损伤规律
水岩作用
蚀变岩
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ISSN0495-5331

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Summary:本文研究水位升降对边坡稳定的影响。选取莱州仓上露天矿坑边坡蚀变岩样,对不同饱水-失水循环次数的蚀变岩进行了三轴压缩试验。对SγJH粘聚力与循环次数关系、内摩擦角与循环次数关系做了回归分析,考虑到粘聚力受水岩作用影响较大,构建粘聚力与应变软化参数联系方程,描述峰后粘聚力变化。进一步分析饱水-失水溶液成分,讨论饱水-失水循环对蚀变岩力学性质损伤机理。结果表明,随循环次数增加,SγJH内摩擦角呈指数形式减小,粘聚力呈二次多项式形式降低;峰后粘聚力随轴向应变变化规律可用双曲函数描述。关于蚀变岩受水岩作用影响机理,从水物理角度看,SγJH内部的微缺陷进一步发展,导致其力学性质的改变;从水化学角度,SγJH中由蚀变产生的黄铁矿及碳酸盐成分发生水解或离子交换,力学性质发生变化。水位升降时蚀变岩粘聚力变化明显,对边坡稳定性有较大影响。
Bibliography:11-2043/P
The objective of this study was to explore the effect of water level variation on slope stability. Samples of altered rock were collected from an open-pit slope in Cangshang, Laizhou of Shandong Province. On these samples, triaxial compression tests were carried out to examine the effect of dif- ferent saturation-dehydration circulating frequencies. After regressing the variation rules of SγJH cohesion and friction angle with cycle times, the most in- fluential factor under water rock interaction was determined. The influence of post-peak cohesion with strain softening parameter was described using the correlation equation. The solution composition after saturation-dehydration circulating was researched to reveal mechanical damage mechanisms of altered rock under water rock interaction. The results indicate that the friction angle of S3,JH decreases exponentially with increasing cycle times and cohesion drops polynomially. The law of post-peak cohesion changing with axial strain can be described by a
ISSN:0495-5331