本文選題：赤泥 + 含水量�。� 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：本文對赤泥作為路基材料的應(yīng)用進(jìn)行了研究。試驗(yàn)使用GDS動三軸儀,模擬交通荷載作用,在大量室內(nèi)試驗(yàn)的基礎(chǔ)上,對山西地區(qū)的赤泥及赤泥黃土復(fù)合體在動荷載作用下的動力特性進(jìn)行了較為系統(tǒng)的研究。研究內(nèi)容主要包括不同含水量赤泥在不同圍壓下的動力學(xué)特性、不同配比的赤泥黃土復(fù)合體在不同圍壓下的動力學(xué)特性。研究的動力學(xué)特性參數(shù)主要有動應(yīng)變、動應(yīng)力、動孔隙水壓力、動強(qiáng)度、動彈模及阻尼比。結(jié)合典型的黃土研究理論和方法,分析了含水量、赤泥含量、圍壓分別對各動力特性的影響。本文取得了如下主要成果和結(jié)論:(Ⅰ)不同含水量赤泥試樣在不同圍壓下的動力性能不同,同一試樣不同階段的動力性能也不相同,但是表現(xiàn)出的規(guī)律有相似性。1、隨著動應(yīng)變的增大,動應(yīng)力、動孔隙水壓力增大,直到試樣破壞;動彈模減小;含水量為18%的試樣阻尼比先減小后增大,而其余含水量試樣則一直減小。2、含水量對動力特性的影響:隨著含水量的增大,孔隙水壓力先減小后增大,動強(qiáng)度先增長后減小,在含水量為24%時達(dá)到最大值,在含水量為36%時最小;最大動彈模E_(dmax)減小;最大阻尼比λmax減小。3、圍壓對動力特性的影響:隨著圍壓增大,動孔隙水壓力、動強(qiáng)度、最大動彈模E_(dmax)、最大阻尼比λmax均增大。4、當(dāng)赤泥含水量為18%時,各種動力參數(shù)均表現(xiàn)良好,所以赤泥作為路基材料的合適含水量為18%。(Ⅱ)不同配比赤泥黃土復(fù)合體在不同圍壓下的動力性能表現(xiàn)為相似的變化規(guī)律,只是在數(shù)值上有所差異。1、隨著動應(yīng)變的增大,動應(yīng)力、動孔隙水壓力增大,直到試樣破壞;動彈模減小;阻尼比增大;2、赤泥含量對動力特性的影響:隨著赤泥含量的增加,動孔隙水壓力減小;動強(qiáng)度出現(xiàn)上下波動趨勢,赤泥含量為30%和70%均為階段峰值;最大動彈模E_(dmax)與動強(qiáng)度變化基本一致,其中赤泥含量為30%、70%、100%為階段峰值;最大阻尼比λmax則與動彈模正好相反。3、圍壓對動力特性的影響:隨著圍壓增大,動孔隙水壓力、動強(qiáng)度、最大動彈模E_(dmax)增大,最大阻尼比λmax先增大后減小。4、赤泥黃土復(fù)合體的最優(yōu)配比:當(dāng)赤泥含量為30%時,試塊既有較大的強(qiáng)度,又有較好的塑性,為較為理想的配比。(Ⅲ)赤泥黃土復(fù)合體固化原理分析:當(dāng)赤泥含量較少時,赤泥對黃土起到固化作用,當(dāng)赤泥含量較多時,黃土影響赤泥的水化作用。當(dāng)赤泥含量為30%時,赤泥對黃土的固化效果最好;赤泥含量為70%時,黃土對赤泥水化作用的促進(jìn)效果最好。
[Abstract]:The application of red mud as subgrade material is studied in this paper. On the basis of a large number of indoor tests, the dynamic characteristics of red mud and red mud loess complex in Shanxi area under dynamic load were studied systematically by using GDS dynamic triaxial instrument to simulate traffic load. The main contents of the study include the dynamic characteristics of red mud with different water content under different confining pressures and the dynamic characteristics of red mud loess complex with different proportions under different confining pressures. The dynamic characteristic parameters are mainly dynamic strain, dynamic stress, dynamic pore water pressure, dynamic strength, dynamic modulus and damping ratio. Combined with typical loess research theory and method, the effects of water content, red mud content and confining pressure on the dynamic characteristics are analyzed. The main results and conclusions obtained in this paper are as follows: (I) the dynamic properties of red mud samples with different water contents are different under different confining pressures, and the dynamic properties of the same samples are different at different stages. With the increase of the dynamic strain, the dynamic stress and the dynamic pore water pressure increase until the specimen is destroyed, the dynamic modulus decreases, and the damping ratio of the sample decreases first and then increases when the moisture content is 18%. The effect of water content on the dynamic characteristics of the other water samples is as follows: with the increase of water content, the pore water pressure decreases first and then increases, and the dynamic strength increases first, then decreases, and reaches the maximum value when the water content is 24. The maximum damping ratio 位 max decreases .3.The effect of confining pressure on dynamic characteristics is as follows: with the increase of confining pressure, dynamic pore water pressure, dynamic strength, When the water content of red mud is 18, all kinds of dynamic parameters are good, and the maximum damping ratio 位 max increases by 0.4.When the water content of red mud is 18, all kinds of dynamic parameters are good. So the suitable moisture content of red mud as subgrade material is 18. (II) the dynamic performance of red mud loess complex with different proportions under different confining pressures shows a similar change law, but there is a difference in numerical value. 1, with the increase of dynamic strain, dynamic stress, The dynamic pore water pressure increases until the specimen is destroyed; the dynamic modulus decreases; the damping ratio increases by 2; the effect of the red mud content on the dynamic characteristics: with the increase of the red mud content, the dynamic pore water pressure decreases; the dynamic strength fluctuates up and down. The red mud content of 30% and 70% is the peak value of the stage, and the maximum dynamic modulus Emax) is basically consistent with the change of dynamic strength, and the red mud content of 30% 70% is the peak value of the stage. The maximum damping ratio 位 max is opposite to the dynamic modulus. 3. The influence of confining pressure on dynamic characteristics: with the increase of confining pressure, dynamic pore water pressure, dynamic strength, maximum dynamic modulus E max), The maximum damping ratio 位 max increases first and then decreases .4.The optimum ratio of red mud and loess complex is as follows: when the content of red mud is 30, the sample has both larger strength and better plasticity. For the ideal ratio. (III) the solidification principle of the red mud loess complex: when the red mud content is low, the red mud plays a solidification role on the loess, and when the red mud content is more, the loess affects the hydration of the red mud. When the content of red mud is 30, the solidification effect of red mud on loess is the best, and when the content of red mud is 70, the promoting effect of loess on the hydration of red mud is the best.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U414

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7 姚s，

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