| 沙漠与沙漠化 |
|
|
|
|
| The Application of Loess Grain Size Fractal Dimension in Regional Classification by Natural Features for Highways in China |
| HOU Chun-mei1,2, LIU Xiao-wei1, LIANG Shou-yun1, CHEN Wen-wu1 |
| 1.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China; 2.Scientific Information Centre for Resources and Environment, Chinese Academy of Sciences, Lanzhou 730000, China |
|
|
|
|
Abstract Highway construction greatly develops in China nowadays, but the regional classification of highways is highly macroscopical and the classification standards are hard to employ, especially in the loess areas of China. The study aims to search for the idea classification scheme and standards. Results of analysis on the fractal dimension (D) of the grain size of loess in Gansu province show that loess has close statistical self-correlation, with fractal dimension values from 2.15 to 2.705. The fractal dimension (D) of soil grain size can not only reflect the sediment environment but also decide the soil physical, mechanical and hydraulic properties. That is, the higher fractal dimension the higher dry density is, also the higher specific surface area, the higher soil cohesion and the higher internal friction angle is; simultaneously, the more micropores are. Whereas, the higher fractal dimension indicates the smaller average aperture, smaller void ratio, smaller collapsibility coefficient and smaller permeability coefficient, thus the stable engineering geology nature of soil. Analyzing results also show that the fractal dimension (D) of loess grain size has obvious spatial variation law, well reflecting the differentiation among the five sub-regions of Gansu second-grade highway classification. All these suggest that the parameter of fractal dimension (D) of the soil grain size could serve as an index for highway regional classification same as the indexes of topography, landform, hydrology, climate and etc.
|
|
Received: 13 October 2008
Published: 07 September 2009
|
|
|
[1]交通部公路规划设计院.公路自然区划标准（JTJ003-86）[S].北京:人民交通出版社,1999:3-7.
[2]侯春梅,刘小伟,李明,等.甘肃黄土的粒度分维特征及意义[J].地质科学,2005,40(4):539-546.
[3]刘东生.黄土与环境[M].北京:科学出版社,1985:303-320.
[4]安芷生,王苏民,吴锡浩,等.中国黄土高原的风积证据:晚新生代北半球大冰期开始及青藏高原的隆升驱动[J].中国科学（D辑）,1998,28（6）:481-490.
[5]董玉祥,Hesp P A,Namikas S L,等.海岸横向沙脊表面风沙流结构粒度响应的野外观测研究[J].中国沙漠,2008,28（6）:1022-1028.
[6]丁仲礼,孙继敏,刘东生.联系沙漠-黄土演变过程中耦合关系的沉积学指标[J].中国科学（D辑）,1999,29（1）:82-87.
[7]鲁瑞洁,夏虹,强明瑞,等.近130 a来毛乌素沙漠北部泊江海子湖泊沉积记录的气候环境变化[J].中国沙漠,2008,28(1):45-49.
[8]鹿化煜,安芷生.黄土高原黄土粒度组成的古气候意义[J].中国科学（D辑）,1998,28（3）:278-283.
[9]管清玉,潘保田,高红山,等.两高分辨率黄土剖面末次冰消期气候事件的差异探讨[J].中国沙漠, 2007,27(2):177-181.
[10]高大钊.岩土工程的回顾与前瞻[M].北京:人民交通出版社,2001:300.
[11]杨东,方小敏,董光荣,等.1.8 Ma BP以来陇西断岘黄土剖面沉积特征及其反映的腾格里沙漠演化[J].中国沙漠,2006,26(1):6-13.
[12]赵景波,陈云.黄土的孔隙与湿陷性研究[J].工程地质学报,1994,2（2）:76-83.
[13]褚娜娜,潘保田,王均平,等.汾渭盆地黄土剖面0.9 Ma前后的粒度突变及其环境意义[J].中国沙漠,2008,28（1）:50-56.
[14]雷祥义.黄土高原地质灾害与人类活动[M].北京:地质出版社,2001.
[15]雷祥义.中国黄土的孔隙类型与湿陷性[J].中国科学（B辑）,1987,（12）:1309-1316.
[16]张贵义,曹家泉,王治军,等.陇东黄土工程地质[M].西安:陕西科学技术出版社,2001:52-69. |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
2009, Vol. 29 
