【摘要】 在酸雨的作用下,大佛砂岩的风化剥蚀作用更加强烈,为定量研究酸雨对乐山大佛基岩的影响,搜集了乐山大佛基岩和乐山酸雨成分资料,进行了模拟酸雨试验。研究表明,乐山大佛原本新鲜的基岩,在长期的风化剥蚀作用下,由外到内形成了粉末层—硬壳层—风化层—新鲜基岩层的表层层次结构。这种层次模式是由岩石表面逐渐向岩石内部发展的。乐山大佛基岩,在最近30a酸雨的作用下,风化剥蚀作用强烈,平均速率在(0.2g/h·m2)左右,被剥蚀厚度约2cm,并提出了相应的防治对策。更多还原

【Abstract】 This paper focused on the effect of the acid rain on the weathering and disintegration of sandstone of the GREAT BUDDHA in Leshan, Sichaun province. The experimental simulation of the acid rain interacted with the fresh sandstone from Cretaceous Jiaguan group and the weathered sandstone from the GREAT BUDDHA. The results show that that the fresh bedrock of the GREAT BUDDHA, with the long weathering and disintegration, formed an top layered-structure made up of four layers: from outside to inside, the powder layer, the layer of hard shell, the weathered layer and the fresh bedrock, which developed gradually from the exterior to the inner fresh rock. The bedrock of the GREAT BUDDHA, under the acid rain, received strong weathering at the average rate of 0.2 gr/h·m~2 and has been disintegrated about 2 cm thickness.更多还原