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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第12期    总第304期    2019年12月

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文章编号:1672-7207(2019)12-3084-13
基于砂岩冻融敏感性的遗迹劣化预测
廖茹雪1, 2,谌文武1, 2,王南1, 2,刘伟1, 2

(1. 兰州大学 土木工程与力学学院,甘肃 兰州,730000;
2. 兰州大学 西部灾害与环境力学教育部重点实验室,甘肃 兰州,730000
)

摘 要: 选择炳灵寺石窟微风化和中风化白垩纪砂岩,根据石窟小气候及水环境特征设计参照组、干燥冻融组、饱水冻融组和干湿冻融交替组4组物理加速风化试验,共进行24次循环,对比它们在每6个循环周期后的劣化模式、孔隙参数及波速的变化,以及循环结束后力学参数、粒径分布、胶结物含量、微观结构、颗粒形态和微孔隙含量等的变化。研究结果表明:较高风化程度砂岩的内部孔隙更容易被改造;围压越高冻融循环越剧烈时,风化程度对岩石三轴压缩强度、残余强度的影响越小;干湿冻融与饱水冻融循环能大幅降低2种风化程度砂岩的胶结物含量,将其变为疏松粗颗粒骨架结构,使其粒径更趋于均匀集中。试样峰值强度与有效孔隙率之间较好的拟合关系可用于指导工程实践。

 

关键词: 砂岩风化;风化程度;冻融循环;三轴试验;敏感性

Forecast of heritage deterioration based on freeze-thaw sensitivity of sandstone
LIAO Ruxue1, 2, CHEN Wenwu1, 2, WANG Nan1, 2, LIU Wei1, 2

1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
2. Key Laboratory of Mechanics on Disaster and Environment in Western China, the Ministry of Education of China, Lanzhou University, Lanzhou 730000, China

Abstract:Two weathering-degree cretaceous sandstones were selected from Bingling Temple Grottoes, and four groups of physical accelerated weathering tests, including reference group, dry freeze-thaw cycles (F-T cycles) group, saturated F-T cycles group, dry-wet and freeze-thaw cycles(D-T and F-T cycles) group, were conducted according to microclimate and water environment of the grottoes on them. There were 24 cycles in the tests, and their deteriorated patterns, changes in pore parameters and wave velocities after every six cycles were compared, as well as variations in mechanical parameters, grain size distribution, cement content, microstructure, particle morphology and micropore content at the end of cycles. The results show inner pores of high weathering-degree sandstone are more easily to be reconstructed. The higher confining pressure and the stronger weathering effect make weathering degree have less influence on triaxial compressive and residual strength of sandstone. D-T and F-T cycles as well as saturated F-T cycles can greatly reduce the contents of cements in two-weathering-degree sandstones and change them into loose coarse-grain-skeleton structure, and the particle size becomes more concentrated. A good fitting relationship between peak strength and effective porosity can be used to guide engineering practice.

 

Key words: sandstone weathering; weathering degrees; freeze-thaw cycles; triaxial test; sensitivity

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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