掺合钢渣的新型混合土工填料压缩变形与强度特性研究

Experimental study on deformation behavior and shear strength of mixed soil blended with steel slag

掺合废弃钢渣的混合轻质土是笔者提出的一种新型填土材料(LSBS),在侧限压缩试验基础上研究了LSBS混合轻质土的应力应变特性,钢渣掺入比以及龄期对应力应变特性的影响规律,以及压缩模量随钢渣掺入比及龄期的变化规律,分析了沉降变形与时间的关系;在直剪试验的基础上研究了抗剪强度随钢渣掺入比及龄期的变化规律,分析了抗剪强度与竖向压应力的关系,得出了LSBS应力应变之间呈现弹塑性特性,压缩模量与抗剪强度随钢渣掺入比以及龄期变化的规律,随着龄期的增长而升高,养护龄期较长时钢渣才能表现水化作用,呈现水泥特性,抗剪强度与竖向压应力的关系符合莫尔–库仑准则,得出了抗剪强度指标,可为工程利用提供参考。

The mixed light-weight soil blended with steel slag is a new filling materials(LSBS) provided by the author, and uniaxial consolidation compression tests are conducted to study the stress-strain characteristics of LSBS and influence behaviors by mixed steel slag ratio and different ages. Furthermore, the effects of mixed steel slag ratio and different ages on the deformation modulus are observed, and the relation between settlement deformation and age is also investigated. Direct shear tests are conducted to study the influence behaviors on shear strength by mixed steel slag ratio and different ages, and the relation between shear strength and vertical stress is also analyzed. Some conclusions are drawn that the stress-strain exhibits elastic-plastic properties, the shear strength and deformation module basically change, and they become higher with the growth of the age. With the increase of the age, the steel slag cement shows water action and presents cement characteristics. The curves of shear strength and vertical stress agree with the Mohr-Coulomb theory. Indexes of shear strength are offered, and this study may provide reference for engineering application.