基于气压劈裂法的气动深松模拟试验
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摘要
气动深松是向耕地犁底层中注入高压气体,使犁底层土壤内部形成裂隙从而打破犁底层,实现土壤深松。为此,基于气压劈裂法进行了气动深松模拟试验,选取喷气压力和深松深度作为试验因素,以土壤坚实度降低率和土面抬升量作为评价指标,研究土壤在高压气体作用下产生的深松作业效果。试验结果表明:喷气压力的增加可以提高土面抬升量和土壤坚实度降低率,且对降低土壤坚实度的作用效果更为明显;深松深度与气动深松效果密切相关,土壤坚实度降低率和土面抬升量随着深松深度的增大而减小。研究表明:气动深松可以高效地打破犁底层,达到较好的土壤深松效果。
During the air-pressure subsoiling,high-pressure air was injected into the plow pan to result in plenty of cracks in the interior of the plow pan,which can break the plow pan and achieve deep soil loosening. In this paper,model experiment of air-pressure subsoiling was conducted based on air-pressure cracking method. We selected the air pressure and depth as the experimental factors,and used the hardness reduction rate and the soil surface uplift value as evaluation indicators to study the effect of deep loosening of soil under high pressure gas. Main results obtained were as follows: the soil surface uplift value and the hardness reduction rate increased with the increase of the air pressure,and the effect on reducing the soil hardness was more obvious; the depth was closely related to the effect,the hardness reduction rate and the soil surface uplift value decreased with increasing depth. The experiment results can show that the air-pressure subsoiling can effectively break the plow pan and achieve a good soil deep loosening effect.
During the air-pressure subsoiling,high-pressure air was injected into the plow pan to result in plenty of cracks in the interior of the plow pan,which can break the plow pan and achieve deep soil loosening. In this paper,model experiment of air-pressure subsoiling was conducted based on air-pressure cracking method. We selected the air pressure and depth as the experimental factors,and used the hardness reduction rate and the soil surface uplift value as evaluation indicators to study the effect of deep loosening of soil under high pressure gas. Main results obtained were as follows: the soil surface uplift value and the hardness reduction rate increased with the increase of the air pressure,and the effect on reducing the soil hardness was more obvious; the depth was closely related to the effect,the hardness reduction rate and the soil surface uplift value decreased with increasing depth. The experiment results can show that the air-pressure subsoiling can effectively break the plow pan and achieve a good soil deep loosening effect.
引文
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[10] Guaman V,Bth B,Hagman J,et al. Short time effects ofbiological and inter-row subsoiling on yield of potatoesgrown on a loamy sand,and on soil penetration resistance,root growth and nitrogen uptake[J]. European Journal ofAgronomy,2016,80:55-65.
[11]左胜甲,孔德刚,刘立意,等.基于气压劈裂原理的气压深松效果试验研究[J].农业工程学报,2016,32(1):54-61.
[12] KING T C. Mechanism of pneumatic fracturing[D]. NewJersey:New Jersey Institute of Technology,1993.
[13] Murdoch L C,Slack W. W. Forms of hydraulic fracture inshallow fine-grained formation[J]. Journal of Geotechnicaland Geoenvironmental Engineering,2000,128(6):479-487.
[14]章定文.气压劈裂机理与排水粉喷桩复合地基设计理论研究[D].南京:东南大学,2007.
[15]刘欣,吕霞,王帅.我国深松机械的现状分析与发展建议[J].农业科技与装备,2011(2):130-131.
[2]张瑞富,杨恒山,高聚林,等.深松对春玉米根系形态特征和生理特性的影响[J].农业工程学报,2015,31(5):78-84.
[3] Suthersen S S. Remediation engineering:design concep B[M]. Boca Raton:CRC Press LLC,1999:238-239.
[4] Larsson,Dahlstorm,Nilssonb. Uniformity of lime-cementcolumns for deep mixing:a field study[J]. Ground improv-ment,2005,9(1):1-16.
[5]韩文君,刘松玉,章定文.土体气压劈裂裂隙扩展特性及影响因素分析[J].土木工程学报,2011(9):87-93.
[6] Shen S L,Miura N,Koga H. Interaction mechanism be-tween deep mixing column and surrounding clay during installation[J]. Canadian Geotechnical Journal,2003,40(2):293-307.
[7]李粮纲,刘德仁,马永林,等.新型园林深层松土施肥机的研制[J].技术与市场,2007(6):38-40.
[8] Zhang H,Araya K,Kudoh M,et al. An Explosive Subsoilerfor the Improvement of Meadow Soil,Part 1:Thermodynamics[J]. Journal of Agricultural Engineering Research,2000,75(2):209-219.
[9] Araya K. Soil failure by introducing fluid under pressure[J]. Journal of Terramechanics,1985,22(3):176.
[10] Guaman V,Bth B,Hagman J,et al. Short time effects ofbiological and inter-row subsoiling on yield of potatoesgrown on a loamy sand,and on soil penetration resistance,root growth and nitrogen uptake[J]. European Journal ofAgronomy,2016,80:55-65.
[11]左胜甲,孔德刚,刘立意,等.基于气压劈裂原理的气压深松效果试验研究[J].农业工程学报,2016,32(1):54-61.
[12] KING T C. Mechanism of pneumatic fracturing[D]. NewJersey:New Jersey Institute of Technology,1993.
[13] Murdoch L C,Slack W. W. Forms of hydraulic fracture inshallow fine-grained formation[J]. Journal of Geotechnicaland Geoenvironmental Engineering,2000,128(6):479-487.
[14]章定文.气压劈裂机理与排水粉喷桩复合地基设计理论研究[D].南京:东南大学,2007.
[15]刘欣,吕霞,王帅.我国深松机械的现状分析与发展建议[J].农业科技与装备,2011(2):130-131.