本文選題：黃土 + 三軸剪切試驗　； 參考：《干旱區(qū)資源與環(huán)境》2014年08期

【摘要】：以陜西涇陽南塬某黃土斜坡第九層(L9)黃土為研究對象,采用常規(guī)三軸試驗探討土體在三軸剪切過程中的應(yīng)力~應(yīng)變關(guān)系、含水率和圍壓對抗剪強度的影響、粘聚力和內(nèi)摩擦角隨含水率的變化規(guī)律等問題。試驗成果表明:1)w=5.3%時,L9黃土應(yīng)力~應(yīng)變曲線呈應(yīng)變軟化,試樣在50KPa、100KPa圍壓下發(fā)生脆性破壞;w=12.3%、19.3%、25%時,應(yīng)力~應(yīng)變曲線均表現(xiàn)為應(yīng)變硬化,試樣呈塑性破壞。2)在相同圍壓下,L9黃土抗剪強度隨含水率的增加而減小;含水率從19.3%增加到25%(飽和)時,抗剪強度下降最快,降幅達75%。3)隨著含水率的增加,L9黃土的粘聚力和內(nèi)摩擦角降低;粘聚力在w=5.3%~12.3%階段內(nèi)下降最快,降幅達73%;內(nèi)摩擦角在w=19.3%~25%階段內(nèi)下降最快,降幅為60%。研究成果對于今后黃土塬滑坡(邊坡)工程治理、監(jiān)測,尤其是黃土塬邊坡安全的早期預(yù)測有重要的參考價值。
[Abstract]:Taking the ninth layer L9 loess of a loess slope in Jingyang Nanyuan, Shaanxi Province as the research object, the stress-strain relationship of soil in triaxial shear process, the influence of moisture content and confining pressure on shear strength were studied by conventional triaxial test. The change of cohesion and internal friction angle with moisture content and so on. The test results show that the stress-strain curve of Loess is strain-softening, and the brittle failure occurs at the confining pressure of 50KPa-100KPa. The stress-strain curves show strain hardening at 25 鈩，

本文編號：1777290