南水北调渠道工程焦作段弱膨胀土改良研究

Research of for Weak Expansive Soil Improvement for South-to-North Water Diversion Project in Jiaozuo Section

针对南水北调中线焦作2段渠道弱膨胀土能否作为堤身填料这一问题,通过控制初始含水率、干密度对重塑弱膨胀土进行了室内试验研究,研究表明:随着干密度的增加,土体的抗剪强度增大,压缩性降低,膨胀性增强,随着初始含水量的提高,土的抗剪强度减小,压缩性增大,膨胀率减小。讨论了非膨胀土包盖和掺入非膨胀土改良、水泥改性弱膨胀土胀缩性可行性。

The indoor experiment for remodeling weak expansive soil has been carried out by controlling the initial water content and dry weight density aiming at making clear if the expansive soil in Jiaozuo can act as the filling materials paper. The research results indicate that with the increase of dry weight density, the shear resistant strength of soilmass increases, compressibility reduces and the expansion increases; Wiith the increase of initial water content, the shear resistant strenght decreases, the com- pressibility increases and dilatability reduces. In conclusion, the possibility of the non-expansive soil covering and mixing with non-expansive soil and cement modifying the weak expansive soil has been discussed.