基于粒度组成分析的砒砂岩与沙复配固沙机理探析
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摘要
砒砂岩与沙复配成土技术已经在毛乌素沙地得到了大规模的推广应用。为给该技术的固沙作用提供数据支撑,研究从粒度组成角度对砒砂岩与沙复配成土固沙机理进行了初探。通过设定7种比例砒砂岩与沙(1∶0、5∶1、2∶1、1∶1、1∶2、1∶5、0∶1)复配土,对二者和复配土的粒度组成特征进行了分析。研究结果表明,毛乌素沙地风沙土粒度组成主要集中在0.05~1mm之间,以粗颗粒占优的粒度组成决定了其抵抗风蚀的能力较弱。而砒砂岩粒度组成主要集中在0.01~0.05mm,其较细的粒度组成具有抵抗风蚀的潜力。砒砂岩与沙复配后其粒度组成向较细的方向转变,复配土抵御风蚀起主导作用的惯性力或内聚力发生了变化。
The technology of soft rock and sand compound soil has been large-scale popularizated and applicated in Mu Us sandy land.With providing data support for the technology of sandfixation role,Seven ratios of soft rock and sand compound soil(1∶0,5∶1,2∶1,1∶1,1∶2,1∶5,0∶1)was conducted,and the size composition of soft rock and sand compound soil was studied.The results showed that the sand-fixtion role of sand had weak ability to resist wind erosion,because the size composition of sand was mainly between 0.05 mm and 1 mm.However,soft rock had the potential to resist wind erosion,because the size composition of soft rock was mainly between 0.01 mm and 0.05 mm.From the perspective of the size particle singly,the ability to resist wind erosion of inertia force and cohesion had been enhanced for the change of thesize compostion of soft rock and sand compound soil.However,it need to further study which ratio of soft rock and sand compound is the best one.From the perspective for size composition of soft rock and sand compound soil,the sand-fixation mechanism of soft rock and sand compound soil was studied in this study.
The technology of soft rock and sand compound soil has been large-scale popularizated and applicated in Mu Us sandy land.With providing data support for the technology of sandfixation role,Seven ratios of soft rock and sand compound soil(1∶0,5∶1,2∶1,1∶1,1∶2,1∶5,0∶1)was conducted,and the size composition of soft rock and sand compound soil was studied.The results showed that the sand-fixtion role of sand had weak ability to resist wind erosion,because the size composition of sand was mainly between 0.05 mm and 1 mm.However,soft rock had the potential to resist wind erosion,because the size composition of soft rock was mainly between 0.01 mm and 0.05 mm.From the perspective of the size particle singly,the ability to resist wind erosion of inertia force and cohesion had been enhanced for the change of thesize compostion of soft rock and sand compound soil.However,it need to further study which ratio of soft rock and sand compound is the best one.From the perspective for size composition of soft rock and sand compound soil,the sand-fixation mechanism of soft rock and sand compound soil was studied in this study.
引文
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[4]Wang N.,Xie J.C.,Han J.C..A Sand Control and Development Model in Sandy Land Based on Mixed Experiments of Arsenic Sandstone and Sand:A Case Study in Mu Us Sandy Land in China[J].Chinese Geographical Science,2013,23(6):700-707.
[5]Wang N,Xie J C,Han J C,et al.A comprehensive framework on land-water resources development in Mu Us Sandy Land[J].Land Use Policy,2014(40):69-73.
[6]于爱忠,黄高宝.保护性耕作对内陆河灌区春季麦田不可蚀性颗粒的影响[J].水土保持学报,2006,20(3):6-9.
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[8]李占宏,海春兴,丛艳静.毛乌素沙地表土粒度特征及其空间变异[J].中国水土保持科学,2009,7(2):74-79.
[9]陈广庭.北京平原土壤机械组成和抗风蚀能力的分析[J].干旱区资源与环境,1991,5(1):103-113.
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[11]董治宝,李振山.风成沙粒度特征对其风蚀可蚀性的影响[J].土壤蚀侵与水土保持学报,1998,4(4):1-5.