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地球科学进展  2011, Vol. 26 Issue (9): 965-970    DOI: 10.11867/j.issn.1001-8166.2011.09.0965
研究论文     
湖南崀山丹霞地貌岩体抗酸侵蚀脆弱性的实验研究
欧阳杰1,朱诚2,彭华3*,胡智农4,俞锦标2,王海昀5,吕文2,徐龙生2
1.广东广播电视大学,广东理工职业学院,广东 广州 510091;
2.南京大学地理与海洋科学学院,江苏 南京 210093;
3.中山大学地理科学与规划学院,广东广州 510275;
4.南京水利科学研究院,江苏 南京 210029;
5.湖南崀山国家地质公园管理处,湖南 新宁 422700
Experimental Research on Vulnerability of Danxia Rocks to Resistance against Acid Erosion in Langshan, Hunan Province
Ouyang Jie1, Zhu Cheng2, Peng Hua3, Hu Zhinong4, Yu Jinbiao2, Wang Haiyun5, Lü Wen2, Xu Longsheng2
1.Guangdong Polytechnic Institute, Radio and TV University of Guangdong, Guangzhou 510091, China;
2.School of Geographic and Oceanographic Sciences,  Nanjing University, Nanjing 210093, China;
3.School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China;
4.Academe of Water Science of Nanjing, Nanjing 210029, China;
5.Bureau of National Geological Park of Langshan,Xinning 422700, China
 全文: PDF(54837 KB)  
摘要:

湖南崀山拥有独特的丹霞喀斯特现象,但具有溶蚀力的水对丹霞地貌区重要的物质基础砂岩和砾岩的侵蚀还没有进行过深入的实验研究。以此为切入点,通过实地采样获得41块砂岩、砾岩岩芯,选择其中18块岩芯平均分成3组,分别放入2%、5%、10% 3种不同浓度的H2SO4溶液中浸泡并连续12天定时观测、记录,最后把未破碎的3块砾岩岩芯进行单轴抗压实验,其抗压强度在9.6~13.7 MPa之间,仅为这些岩体干抗压强度的1/10左右。通过4处采样地的实验数据对比还发现,崀山砾岩抗酸侵蚀后的抗压强度是最低的,如果遭到同样外力的破坏,崀山丹霞岩体更容易破损倒塌。以上岩芯抗酸侵蚀的脆弱性和岩芯的物质组成、结构等有关。在宏观实验观测的基础上,初步微观半定量分析解释了丹霞地貌区砂岩和砾岩抗酸侵蚀脆弱性的一般特点,为今后更加合理地保护崀山丹霞地貌提供依据。

关键词: 丹霞地貌世界自然遗产地湖南崀山抗酸实验    
Abstract:

The unique phenomenon of Karst in Danxia Landforms may be observed in Langshan, Hunan Province, but there are rare deep exploration about acid erosion to sandstones and conglomerates which are important material foundation in Danxia Landform areas. Base on this point, 41 cores of sandstones and conglomerates were collected from Langshan, 18 cores were selected from them and put into sulfuric acid solutions with three different contents of 2%, 5%, 10%, observed, and recorded continuously for 12 days. Three cores which were not collapsed were undone uniaxial against pressure test at last. The strengths of against pressure of conglomerates declined dramatically after acid erosion, the values to against pressure remained 1/10 only to these rocks in the dry condition. Also the strengths of the 3 cores to uniaxial against pressure after acid erosion were the  lowest in the four sampling sites by analyzing experimental data, so the Danxia rocks in Langshan are easy to collapse and destroy under the same external forces. The reasons of vulnerability to against acid erosion of rocks in Danxia landform are relevant closely to components and structures of those cores by identifications under a polarizing microscope to flakes. Based on macroscopic experimental observations,  general characteristics of against acid erosion vulnerability of sandstones and conglomerates in Danxia Landform areas were micro semi-quantitative analyzed and explained. It is valuable to provide basis for protecting the world natural heritage site and get a sustainable utilization for mankind in the future.

Key words: Langshan of Hunan province    Danxia landform    Acid-resistance     experiment    World natural heritage site
收稿日期: 2011-03-21 出版日期: 2011-09-10
:  P931  
基金资助:

国家自然科学基金项目“丹霞地貌发育的外动力机制研究”(编号:40871014)资助.

通讯作者: 彭华(1956-),男,安徽砀山人,教授,博士生导师.主要从事旅游地理、旅游规划、城市旅游、城市与区域发展战略研究.      E-mail: eesph@mail.sysu.edu.cn
作者简介: 欧阳杰(1969-),男,安徽蚌埠人,讲师,主要从事丹霞地貌、旅游景区管理等研究. E-mail:oyang692000@yahoo.com.cn
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引用本文:

欧阳杰,朱诚,彭华,胡智农,俞锦标,王海昀,吕文,徐龙生. 湖南崀山丹霞地貌岩体抗酸侵蚀脆弱性的实验研究[J]. 地球科学进展, 2011, 26(9): 965-970.

Ouyang Jie, Zhu Cheng, Peng Hua, Hu Zhinong, Yu Jinbiao, Wang Haiyu,et al. Experimental Research on Vulnerability of Danxia Rocks to Resistance against Acid Erosion in Langshan, Hunan Province. Advances in Earth Science, 2011, 26(9): 965-970.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2011.09.0965        http://www.adearth.ac.cn/CN/Y2011/V26/I9/965

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