砾钢渣抗液化特性试验研究

Anti-liquefaction characteristics of gravel steel slag

陈化的钢渣作为土工回填材料是废弃钢渣循环利用的主要途径之一。按土的工程分类方法,将废弃钢渣划分为砾钢渣、粗钢渣和细钢渣。针对砾钢渣,考虑固结应力比、振动频率、围压和含砾量等影响因素开展动三轴试验研究。分析了砾钢渣的应力、应变和动孔隙水压力的特性,分析了砾钢渣试样的动强度与振动次数、动应变与振动次数、孔隙水压力与振动次数和动应力与动应变关系。采用Seed和Finn提出的饱和砂土动孔压计算模型分析砾钢渣的动孔压曲线类型,并与传统砂砾土的抗液化强度进行比较。得出砾钢渣的抗液化特性较好,工程中可以用砾钢渣替代传统的砂土、砂砾土、砂砾料和砂卵石作为回填料,解决砂砾资源日渐短缺的问题。

The use of aged steel slag as geotechnical backfill material is one of the main ways of recycling waste steel slag.According to the engineering classification method of soil,the waste steel slag is divided into gravel steel slag,coarse steel slag and fine steel slag.For the gravel steel slag,the dynamic triaxial tests were carried out by considering the influencing factors,such as consolidation stress ratios,vibration frequencies,confining pressures and gravel contents.The relationships between dynamic strength and vibration times,dynamic strain and vibration times,pore water pressure and vibration times,dynamic stress and dynamic strain of the gravel steel slag samples were analyzed.The calculation model of saturated sand dynamic pore pressure proposed by Seed and Finn was used to analyze the types of dynamic pore pressure curves of gravel steel slag.Compared with the anti-liquefaction strength of the traditional gravel soil,the anti-liquefaction characteristics of gravel steel slag are better.In the practical engineering,gravel steel slag can be used to replace traditional sand,gravel soil,sand gravel and sand pebbles as backfill materials,to solve the shortage problem of gravel resources.