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为了更加全面地研究水泥土处于不同酸碱环境时的力学与渗透特性,针对湖南地区特有的红黏土,综合考虑含水率、水灰比和水泥掺入量等因素的影响,并基于正交设计方法进行一系列试验研究,得到龄期分别为3,7和28 d时水泥土的无侧限抗压强度和渗透系数,掌握了不同酸碱环境及各个试验因素对其影响规律,并利用SPSS软件对它们之间的关系进行拟合。试验结果表明:在不同酸碱环境下,水泥土均可较好地改善红黏土的力学与渗透特性;碱性环境下水泥土的无侧限抗压强度更高、渗透系数更低,酸性环境则呈相反趋势;这3种因素对水泥土无侧限抗压强度和渗透系数影响的主次顺序均是含水率→水泥掺量→水灰比,含水率是最主要的影响因素,随含水率增加试样的强度近似呈线性降低、渗透系数则明显变大;当含水率较低、水灰比较低或水泥掺入量较大时,红黏土的pH值对水泥土渗透特性影响很弱,这些因素发生改变后,水泥土渗透特性的变化规律则各不相同。
In order to study the mechanics and permeation characteristics of cement soil under different acid-alkali environments more completely, aiming at the characteristic of red clay in Hunan Province, considering the factors of water content, water-cement ratio and cement incorporation, Method, a series of experimental studies were conducted. The unconfined compressive strength and permeability coefficient of cement-soil with ages of 3, 7 and 28 d were obtained respectively. The influences of different acid-base environments and various experimental factors were grasped. SPSS The software fits the relationship between them. The results show that cement and soil can improve the mechanics and infiltration properties of red clay better under different acid and alkali environments. In alkaline environment, the unconfined compressive strength of cement soil is higher and the permeability coefficient is lower, while the acid environment The opposite trend of the three factors on the unconfined compressive strength of cement soil and permeability coefficient of the primary and secondary order are the water content → cement content → water-cement ratio, the water content is the most important factor, with the water content The strength of the sample increased approximately linearly and the permeability coefficient obviously increased. When the water content was lower, the water-cement ratio was lower or the content of cement was larger, the pH value of red clay had little effect on the permeability of cement soil. Changes in these factors, the cement soil infiltration characteristics of the variation is different.