科学技术与工程
科學技術與工程
과학기술여공정
Science Technology and Engineering
2015年
29期
174-178
,共5页
Cu2+%重塑黄土%抗剪强度%电阻率
Cu2+%重塑黃土%抗剪彊度%電阻率
Cu2+%중소황토%항전강도%전조솔
Cu2+%remolded loess%shear strength%electrical resistivity
为研究Cu2+含量不同对重塑土的抗剪强度影响以及剪切过程中电阻率变化,进行了室内直剪试验。制取含量为0 mg/kg、5 mg/kg、50 mg/kg、500 mg/kg、5000 mg/kg的五种Cu2+污染重塑土,对其进行直剪试验和电阻率试验,最后处理并分析数据。结果表明:随Cu2+含量增加,电阻率减小,且电阻率浮动变小,电阻率随剪切位移增大呈减小的趋势,含量500 mg/kg时的电阻率浮动小,规律明显;Cu2+污染土剪应力随剪切位移增大不断增加,没有明显的屈服点;Cu2+含量小于5 mg/kg时, Cu2+污染土抗剪强度随Cu2+含量增加而增加,Cu2+含量大于500 mg/kg时,Cu2+污染土抗剪强度随Cu2+含量增加而减小;同一含量下的污染土在不同垂直压力下的抗剪强度与电阻率呈负相关,Cu2+含量越大抗剪强度变化对电阻率越不敏感;定义了电阻率角、初始电阻率,电阻率角反映电阻率对土体结构变化的敏感程度,初始电阻率为土体在没有垂直压力作用下时的电阻率。
為研究Cu2+含量不同對重塑土的抗剪彊度影響以及剪切過程中電阻率變化,進行瞭室內直剪試驗。製取含量為0 mg/kg、5 mg/kg、50 mg/kg、500 mg/kg、5000 mg/kg的五種Cu2+汙染重塑土,對其進行直剪試驗和電阻率試驗,最後處理併分析數據。結果錶明:隨Cu2+含量增加,電阻率減小,且電阻率浮動變小,電阻率隨剪切位移增大呈減小的趨勢,含量500 mg/kg時的電阻率浮動小,規律明顯;Cu2+汙染土剪應力隨剪切位移增大不斷增加,沒有明顯的屈服點;Cu2+含量小于5 mg/kg時, Cu2+汙染土抗剪彊度隨Cu2+含量增加而增加,Cu2+含量大于500 mg/kg時,Cu2+汙染土抗剪彊度隨Cu2+含量增加而減小;同一含量下的汙染土在不同垂直壓力下的抗剪彊度與電阻率呈負相關,Cu2+含量越大抗剪彊度變化對電阻率越不敏感;定義瞭電阻率角、初始電阻率,電阻率角反映電阻率對土體結構變化的敏感程度,初始電阻率為土體在沒有垂直壓力作用下時的電阻率。
위연구Cu2+함량불동대중소토적항전강도영향이급전절과정중전조솔변화,진행료실내직전시험。제취함량위0 mg/kg、5 mg/kg、50 mg/kg、500 mg/kg、5000 mg/kg적오충Cu2+오염중소토,대기진행직전시험화전조솔시험,최후처리병분석수거。결과표명:수Cu2+함량증가,전조솔감소,차전조솔부동변소,전조솔수전절위이증대정감소적추세,함량500 mg/kg시적전조솔부동소,규률명현;Cu2+오염토전응력수전절위이증대불단증가,몰유명현적굴복점;Cu2+함량소우5 mg/kg시, Cu2+오염토항전강도수Cu2+함량증가이증가,Cu2+함량대우500 mg/kg시,Cu2+오염토항전강도수Cu2+함량증가이감소;동일함량하적오염토재불동수직압력하적항전강도여전조솔정부상관,Cu2+함량월대항전강도변화대전조솔월불민감;정의료전조솔각、초시전조솔,전조솔각반영전조솔대토체결구변화적민감정도,초시전조솔위토체재몰유수직압력작용하시적전조솔。
To study the shear strength and electrical resistivity of remolded loess contaminated by Cu 2+in differ-ent quantity , laboratory tests were conducted .Remolded loess samples contaminated by Cu 2+was prepared in the quantity of 0 mg/kg、5 mg/kg、50 mg/kg、500 mg/kg、5000 mg/kg, then tested the electrical resistivity and shear strength, handled and analyzed the dates .The results showed that: with Cu2+increasing, the electrical resistivity decreased , and floated smaller , the principle was better and the floating was smaller when Cu 2 +was 500 mg/kg;with the displacement increasing , the shear strength increased all through;when the quantity of Cu 2 +was smaller than 5 mg/kg, the shear strength increased with the Cu 2+increasing, when the quantity of Cu2+was bigger than 500 mg/kg, the shear strength decreased with the Cu 2+increasing , the larger the electrical resistivity , the smaller the shear strength;with Cu2+increasing, the shear strength was less sensitive to electrical resistivity; defined the electrical resistivity grade and the original electrical resistivity of remolded loess , the larger the electrical resistivity it can reflect the changes of the soil ’ s structure better ,the original electrical resistivity stand for the electrical resis-tivity when there was no press on the soil .