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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第4期    总第260期    2016年4月

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文章编号:1672-7207(2016)04-1420-07
青藏高原地区典型土遗址冻融与盐渍耦合劣化作用分析
蒲天彪1, 2,谌文武1,吕海敏1,杜昱民1

(1. 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;
2. 中国国家民族博物馆,北京,100080
)

摘 要: 研究基于高原地区冬季降雪过程环境监测数据和多处典型土遗址的易溶盐含量与分布特征,通过对实验条件下分别掺入质量分数为0.2%的梯度增量掺入无水氯化钠和无水硫酸钠至质量分数为1%并经历冻融循环的遗址土重塑土样的风洞、崩解、弹性波速和剪切实验,揭示耦合作用下表征土遗址抗风蚀能力、抗雨蚀能力和强度等指标的劣化规律和本质原因,并对底部掏蚀、片状剥离和坍塌等高原地区典型土遗址病害形成过程以及与上述性质变化的内在联系进行剖析和阐释。研究结果表明:试样抗雨蚀能力、抗风蚀能力和强度相关指标会对耦合作用产生明显的劣化响应,因掺入盐分类型和含量的不同而表现出非线性衰减规律;相关性质的劣化为典型病害的发育提供了前提和基础。

 

关键词: 青藏高原;土遗址;冻融;盐渍;耦合劣化

Analysis on function of deterioration of typical earthen ruins under the coupling of salinized and freezing and thawing in Qinghai-Tibet Plateau
PU Tianbiao1, 2, CHEN Wenwu1, Lü Haimin1, DU Yumin1

1. Key Laboratory of Mechanics on Disaster and Environment in Western China,
Ministry of Education, Lanzhou University, Lanzhou 730000, China;
2. The National Museum of Ethnology, Beijing 100080, China

Abstract:Based on the environmental monitoring data and the analysis of the soluble salt content and distribution to several typical ruins during the process of winter snowfall in the plateau region, wind tunnel, disintegration, elastic wave velocity and shearing experiments in laboratory on remodeling sample mixed with the mass fraction of 0.2%–1% of anhydrous sodium sulfate and sodium chloride and through the freeze-thaw cycle after desalination were studied, to reveal the change rule of properties and essential reasons on those with the joint function of salinized and freezing and thawing, which characterizes the ability of ruins to resist wind erosion, rain erosion and indexes of strength. And then inner link between the forming processes of typical diseases such as detachment of bottom undercutting, surface crust and collapses was analyzed and explained. The results show that the ability of ruins to resist wind erosion, rain erosion and indexes of strength have significant deterioration response to coupling processes, which has non-linear attenuation law as mixing different typed and content of salt. In addition, the deterioration of related properties provides precondition and basis for the development of typical diseases.

 

Key words: Qinghai-Tibet Plateau; earthern ruin; freezing and thawing; salinized; coupling deterioration

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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