呼伦贝尔沙质草原表土物理力学性质

doi:10.7522/j.issn.1000-694X.2014.00083

摘要/Abstract

摘要：

通过野外现场调查、载荷试验、轻型圆锥动力触探及室内试验,对呼伦贝尔沙质草原厚度30 cm的表层沙土物理力学性质及承载力、剪切变形特征进行研究。结果表明:表层沙土工程分类为细砂,颗粒级配不良,沿深度有明显分层;干密度1.34～1.51 g·cm^-3,黏聚力12～27.4 kPa,内摩擦角22.5°～24.0°,变形模量8.5 MPa;各指标表明沙土的工程性质上部差于下部;沙土承载力特征值和极限承载力分别为150 kPa和300 kPa,承载力不足导致表层沙土发生冲剪破坏(塑性破坏)和整体剪切破坏(脆性破坏)。

关键词: 表土层, 承载力, 越野交通, 风蚀坑, 沙漠化

Abstract:

Research into topsoil texture, physical and mechanical properties within the depth of thirteen centimeters has been carried out based on field survey and laboratory tests on bearing capacity and shear deformation analysis in the sandy grassland of Hulunbuir, Inner Mongolia. It is discovered that the topsoil could be named fine sand, with poor grain size distribution, and layered structure. Soil dry density is between 1.34 g·cm^-3 and 1.51 g·cm^-3, soil cohesive forces between 12 kPa and 27.4 kPa, soil internal friction angle falls between 22.5° and 24°, and soil modulus of deformation is 8.5 MPa. It was discovered that the soil engineering property of the lower bed is better. Top soil characteristic value of bearing capacity was 150 kPa, and its ultimate bearing capacity was 300 kPa. Punching shear destruction (The plastic damage) and General shear failure(Brittle failure)is usual as soil carrying capacity is weak.

Key words: topsoil mantle, bearing capacity, off road vehicle traffic, blowout, sandy desertification

中图分类号:

S152.9

殷玲, 张德平, 成永会, 靳立宁, 赵家明, 巴日斯, 海军, 祁晓燕, 屈建新. 呼伦贝尔沙质草原表土物理力学性质[J]. 中国沙漠, 2015, 35(4): 930-936.

Yin Ling, Zhang A. MunkhDalai, Cheng Yonghui, Jin Lining, Zhao Jiaming, Barisi, Hai Jun, Qi Xiaoyan, Qu Jianxin. Top Soil Texture, Physical and Mechanical Property of the Hulunbuir Sandy Grassland, Inner Mongolia, China[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(4): 930-936.

参考文献

[1] 张德平,王效科,胡日乐,等.呼伦贝尔沙质草原风蚀坑研究(3)——微地貌与土层的影响[J].中国沙漠,2007,27(1):25-31.
[2] 董光荣,李长治,金炯,等. 关于土壤风蚀风洞模拟实验的某些结果[J]. 科学通报,1987,32:297-301.
[3] 贺大良,邹本功,李长治,等.地表风蚀物理过程风洞实验的初步研究[J].中国沙漠,1986,6(1):25-31.
[4] 张德平,王效科,哈斯,等.呼伦贝尔沙质草原风蚀坑研究(1)——形态、分类、研究意义[J].中国沙漠,2006,26(6):894-902.
[5] 张德平,孙宏伟,王效科,等.呼伦贝尔沙质草原风蚀坑研究(2)——发育过程[J].中国沙漠,2007,27(1):20-24.
[6] 张德平,王效科,孙宏伟,等.呼伦贝尔沙质草原风蚀坑研究(4)——人类活动的影响[J].中国沙漠,2007,27(2):214-220.
[7] Timothy L D.Grassland plant composition alters vehicular disturbance effects in Kansas,USA[J].Environmental Management,2008,41(5):676-684.
[8] 乌仁其其格,张德平,王常顺,等.车辆碾压对草原地下生物量和土壤养分的影响[J].草业科学,2013,30(10):1513-1516.
[9] 胡霞,刘连友,孙永亮,等.交通对干草原土壤物理性质影响的试验研究[J].土壤学报,2006,43(2):215-219.
[10] 杨颖慧,张锦华,杨春华.退化草地恢复生态对土壤物理性状的影响[J].水土保持学报,2006,(20)5:56-59.
[11] 张琳琳,丁国栋,肖萌,等.干草原区车辆碾压对土壤理化性质的影响[J].干旱区资源与环境,2013,27(12):81-86.
[12] Richard M I.Processes of accelerated pluvial erosion on desert hillslopes modified by vehicular traffic[J].Earth Surface Processes,1980,5(4):369-388.
[13] GB50021-2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2009:101-103,139-140.
[14] 姚正毅,陈广庭,韩致文,等.塔克拉玛干沙漠腹地风沙土的力学性质[J].中国沙漠,2001,21(1):28-33.
[15] 邵生俊,林颂恩.塔克拉玛干沙漠腹地岩土工程性质的初步揭示与分析[J].岩土工程学报,1997,19(4):94-99.
[16] 季方,樊自立,赵贵海.新疆两大沙漠风沙土土壤理化特性对比分析[J].干早区研究,1995,12(1):19-25.
[17] 杨小荟,王玉宝, 崔东,等.古尔班通古特沙漠砂的物理力学性质[J].中国沙漠,2005,25(4):563-569.
[18] 赵明华.土力学与基础工程[M].武汉:武汉理工大学出版社,2010:62-63,141-142,163-166.
[19] 侍倩.植被对斜坡土体土力学参数影响的试验研究[J].岩土力学,2005,26(12):27-30.
[20] 屈智炯.土的塑性力学[M].成都:成都科技大学出版社,1987:91-94.