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粘性土重塑方法分析與破碎性能比較
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國家自然科學(xué)基金資助項(xiàng)目(50875031);中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(KYZ201161);江蘇省產(chǎn)學(xué)研聯(lián)合創(chuàng)新項(xiàng)目(BY2011160)


Comparison of Fragmentation Properties and Remolding Techniques for Clay Soil
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    摘要:

    對(duì)揉搓法與非標(biāo)準(zhǔn)普氏擊制樣方法進(jìn)行對(duì)比,結(jié)果表明后者為土壤破碎機(jī)理研究提供了更多可控的土壤狀態(tài),同時(shí)土樣的力學(xué)行為更為穩(wěn)定,因此便于定量研究粘性土的密度、含水率、擊實(shí)功、比沖擊破碎能之間的關(guān)系。試驗(yàn)結(jié)果表明密度不能準(zhǔn)確反映粘性土的粒間結(jié)合強(qiáng)度,而比沖擊破碎能可以反映土粒間的結(jié)合緊密程度,這表明傳統(tǒng)的以密度或者相對(duì)緊實(shí)度為參照的土壤耕作比阻預(yù)測方法需要改進(jìn)。將非標(biāo)準(zhǔn)普氏擊與沖擊破碎測試相結(jié)合的試驗(yàn)結(jié)果表明,土樣的比沖擊破碎能隨擊實(shí)時(shí)土壤含水率的增大呈指數(shù)增長趨勢(shì),土壤破碎體的分形維數(shù)隨含水率呈對(duì)數(shù)下降的規(guī)律。

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    Non-standard Proctor compaction as a soil remolding technique was compared with hand-rolling method. Non-standard Proctor compaction modified soil physical states in a large, stable and controlled manner, allowing the investigation of the co-relationship among soil density, water content, compacting work and specific soil fragmentation energy possible. It was found that density alone did not reflect cohesive soil compaction precisely; in contrary the specific fragmentation energy was more sensitive to inter-aggregate cohesion force. Therefore there is a need to refine the habit of using soil density or relative compaction as a proxy for modeling the specific traction in soil tillage research. The combined procedure of non-standard Proctor compaction and fragmentation test provided an increased exponential trend of specific fragmentation energy with respect to soil water content, while the fractal dimension of soil fragments decreased.

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丁啟朔,沈鳳悅,丁為民,李毅念,潘根興,姬長英.粘性土重塑方法分析與破碎性能比較[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2013,44(1):90-94. Ding Qishuo, Shen Fengyue, Ding Weimin, Li Yinian, Pan Genxing, Ji Changying. Comparison of Fragmentation Properties and Remolding Techniques for Clay Soil[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(1):90-94.

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  • 在線發(fā)布日期: 2012-12-31
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