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首页> 外文期刊>Bulletin of engineering geology and the environment >Effects of rain and heat-cool cycles on the weathering behavior of basalt from Wudalianchi, Heilongjiang Province, NE China
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Effects of rain and heat-cool cycles on the weathering behavior of basalt from Wudalianchi, Heilongjiang Province, NE China

机译：降雨和热-冷循环对黑龙江五大连池玄武岩风化行为的影响

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摘要

This paper evaluates the weathering behavior and weathering degree of basalt from the Wudalianchi UNESCO Global Geopark in the north-east of China. The geopark possesses the most typical and perfect geoheritage examples of a modern volcanic eruption activities in China. Laboratory experiments were conducted on basalt samples to simulate basalt's weathering process under different environmental conditions. The basalt samples were subjected to either 10 rain cycles or 375 heat-cool cycles. After different numbers of cycles, the weight loss, ultrasonic velocity, and 3D surface morphology were quantitatively evaluated. All the treatments led to sample weight loss. However, the different factors (i.e., water and temperature) result in different degrees and patterns of basalt weathering. In the rain cycles, the sample surfaces became smoother, but new pores were detected. The coupled effects of the mechanical erosion by rain and the tensile stress generated by water invasion and air escape are considered the primary mechanism of grain detachment from the sample surface. In the heat-cool cycles, the sample surfaces became rougher, and the sample's mechanical properties display a decreasing trend with an increase in heat-cool cycles. Thermally-induced stress led to grain detachment in the sample surface and internal particle dislocation, which initiates internal cracks. The experimental results have direct significance for the protection of basalt in the Wudalianchi UNESCO Global Geopark.
机译：本文评估了中国东北部五大连池市联合国教科文组织全球地质公园的玄武岩的风化行为和风化程度。该地质公园拥有中国现代火山喷发活动中最典型，最完美的地质遗产实例。在玄武岩样品上进行了实验室实验，以模拟玄武岩在不同环境条件下的风化过程。玄武岩样品经历了10次降雨循环或375次热冷循环。经过不同的循环次数后，对重量损失，超声速度和3D表面形态进行了定量评估。所有处理导致样品重量减轻。但是，不同的因素（即水和温度）导致玄武岩风化程度和模式不同。在雨水循环中，样品表面变得更光滑，但发现了新的孔隙。雨水引起的机械侵蚀与水分入侵和空气逸出所产生的拉应力的耦合效应被认为是晶粒从样品表面脱离的主要机理。在热-冷循环中，样品表面变得更粗糙，并且随着热-冷循环的增加，样品的机械性能显示出下降的趋势。热诱导的应力导致样品表面的晶粒脱离和内部颗粒错位，从而引发内部裂纹。实验结果对保护五大连池联合国教科文组织全球地质公园的玄武岩具有直接意义。

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