复合固化砂土力学及水稳性能试验研究

Experimental Research on Mechanical Property and Water Stability of Complex Stabilized Sandy Soil

为探究经水泥、石灰和改性聚丙烯纤维复合固化砂土的力学及水稳性能,进行了系列室内试验,结果表明:随水泥掺量增加,固化砂土无侧限抗压强度和劈裂抗拉强度增大,但增长幅度减小,用一定量石灰取代水泥会降低水泥土强度,纤维可以提高水泥土强度,尤其是抗拉强度;水泥可大幅提高砂土抗剪强度和抗压回弹模量,随着纤维掺量的增加,固化土抗剪强度低于水泥土,黏聚力和回弹模量先增大后又减小,内摩擦角与黏聚力表现出负相关性;0.3%纤维加筋8%水泥固化土可以满足简易机场对基层材料的要求。

In order to explore the mechanical property and water stability of complex stabilized sandy soil,a series of indoor tests were conducted.Results show that unconfined compressive strength and splitting tensile strength increase along with the rise of cement ratio,but the range decrease,replacing some cement by lime reduce the strength.Polypropylene fiber can raise the strength,especially for the splitting tensile strength.Cement can raise the shear strength and compression rebound modulus.Along with increase of fiber＇s ratio,the shear strength of stabilized soil is less than cement stabilized soil,the cohesion and compression rebound modulus increase first and then decrease.The internal friction angle shows negative correlation with cohesion.0.3 percent of fiber and 8 percent of cement stabilized sandy soil can meet the demand of field airfield to basic level material.