砒砂岩与沙复配土抗风蚀能力研究

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英文篇名：Study on wind erosion resistance of composite soil with soft rock and sand 作者：赵宣 ; 王欢元 ; 张露 英文作者：ZHAO Xuan;WANG Huanyuan;ZHANG Lu;Northwest Branch of Shaanxi Land Engineering Construction Group Co., Ltd.;Institute of Land Engineering and Technology, Shaanxi Land Engineering Construction Group Co., Ltd.; 关键词：砒砂岩 ; 沙 ; 抗剪强度 ; 抗风蚀能力 ; 影响因素 英文关键词：soft rock;;sand;;shear strength;;wind erosion resistance;;influencing factors 中文刊名：西部大开发(土地开发工程研究) 机构：陕西省土地工程建设集团有限责任公司西北分公司;陕西地建土地工程技术研究院有限责任公司; 出版日期：2019-07-20 出版单位：西部大开发(土地开发工程研究) 年：2019 期：07 语种：中文; 页：41-44+55 页数：5 CN：61-1373/F ISSN：1009-8631 分类号：S157

摘要

陕北毛乌素沙漠南缘地区广泛分布着"两害"——砒砂岩和沙,严重影响着当地作物的生长。为改善区域生态环境,实现资源的合理化利用,本研究将砒砂岩(P)和沙(S)按照不同的质量比进行复配(m(P)∶m(S)=1∶1,1∶2,1∶5),通过测定复配土的粘聚力、内摩擦角、风蚀量等一系列基本理化指标,研究复配土的抗风蚀能力及其影响因素。结果表明:随着砒砂岩含量的增加,复配土的粘聚力逐渐增加,抗剪强度增大,内摩擦角逐渐减小,风蚀量逐渐减小,抗风蚀能力逐渐增强。其中,1∶1复配土的粘聚力最大,内摩擦角最小,风蚀量最小;1∶5复配土的粘聚力最小,内摩擦角最大。砒砂岩的加入,可以显著降低风沙土的风蚀量,增强该地区风沙土的抗风力侵蚀能力。另外,粘聚力与容重有极显著的负相关性,粘粒含量与内摩擦角有极显著的负相关性,风蚀量和砒砂岩含量占比有极显著的负相关性。风蚀量和内摩擦角、容重有很强的正相关性,与粘聚力、分形维数、粘粒、粉粒含量有很强的负相关性。
        The "two barrier factors"-soft rock and sand are widely distributed in the southern margin of the Mu Us sand land in northern Shaanxi, which seriously affects the growth of local crops. In order to improve the regional ecological environment and realize the rational utilization of resources, this study synthesized a composite soil which was compounded with the soft rock(P) and sand(S) according to different mass ratios(m(P)∶m(S)=1∶1, 1∶2, 1∶5). Then the wind erosion resistance and its influencing factors of composite soil were studied by measuring a series of basic physical and chemical indicators such as cohesion, internal friction angle and wind erosion. The results showed that with the increase of the content of soft rock, the cohesive force of the composite soil increased gradually and the shear strength and the ability to resist wind erosion increased and the internal friction angle decreased and the wind erosion decreased. Among them, the 1∶1 composite soil had the highest cohesion, the inner friction angle was the smallest, and the wind erosion was the smallest. 1∶5 composite soil had the smallest cohesion, and the inner friction angle was the largest. The addition of soft rock could significantly reduce the wind erosion of sand and enhance the wind erosion resistance of the area. In addition, there was a significant negative correlation between cohesive force and bulk density. There was a significant negative correlation between clay content and internal friction angle, between wind erosion and soft rock content. There was a strong positive correlation between wind erosion and internal friction angle and bulk density, and a strong negative correlation with cohesion, fractal dimension, clay and silt content.

引文

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