土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (1): 34-37.

• 专题论述 • 上一篇    下一篇

模拟酸雨对桂林石灰岩石刻的溶蚀规律及机理

李屹然，董兵红，倪 喆，谭明灿，席丹妮   

  1. （桂林理工大学，广西桂林 541004）
  • 收稿日期:2020-02-15 修回日期:2020-02-22 出版日期:2021-02-28 发布日期:2021-03-01
  • 作者简介:李屹然(1995-)，男，硕士研究生，研究方向为地质灾害与工程地质。

Dissolution of Guilin Limestone Carvings by Acid Rain and its Simulation

LI Yiran, DONG Binghong, NI Zhe, TAN Mingcan, XI Danni   

  1. (Guilin University of Technology, Guilin 541004)
  • Received:2020-02-15 Revised:2020-02-22 Online:2021-02-28 Published:2021-03-01

摘要： 随着工业化和城市化的发展，酸雨的产生比以前更加频繁，桂林很多石刻都遭受不同程度的侵蚀残损。为做好保护桂林石灰岩石刻的准备和提供数据，研究石灰岩被酸雨溶蚀的规律，选取灰岩质纯的样品经加工处理，在不同pH值酸性溶液中浸泡，记录pH值、Ca2+浓度、质量损失变化分析规律，并通过化学热力学计算分析溶蚀机理。结果表明，刻痕对酸雨溶蚀有一定的促进作用，且酸雨pH值越低，对石灰岩的溶蚀程度越深，质量损失越大，是大pH值酸雨的2.26～9.21倍，硫酸比碳酸对石灰岩溶蚀程度更大。

关键词: 模拟酸雨, 石灰岩, 溶蚀, 吉布斯自由能

Abstract: With the development of industrialization and urbanization, the occurrence of acid rain is more frequent than before. Many stone carvings in Guilin suffer from different degrees of erosion and damage. In order to prepare for the protection of Guilin limestone carvings and provide baseline information, the mechanism of limestone dissolution by acid rain was studied. Pure limestone samples were processed and soaked in acid solutions with different pH values. The pH value, Ca2+concentration and limestone mass loss were evaluated, and the dissolution mechanism was analyzed by the chemical thermodynamical calculation. The results show that the scratch dents can promote the dissolution of acid rain to a certain extent. The lower the pH value of acid rain is, the deeper the dissolution degree of limestone is. The greater the mass loss is, which is 2.26～9.21 times of that of acid rain with large pH, and the greater the dissolution degree of sulfuric acid than that of carbonate.


Key words: acid rain, limestone, erosion, gibbs free energy

中图分类号: