Abstract

Due to the continuous scarcity of sand and gravel under environmental protection policies, a new geo-backfill material with the good liquefaction resistance is urgently needed. Steel slag is a kind of industrial solid waste. The aged eight-month steel slag usually could be used as backfill material. It is important to investigate the liquefaction resistance behaviours of steel slag. According to the soil classification method, the waste steel slag is also divided into gravel steel slag, coarse steel slag and fine steel slag. Dynamic triaxial tests were carried out to investigate the liquefaction resistance of gravel steel slag in the paper by considering the effects of consolidation stress ratio, loading frequency, confining pressure and gravel-size particle contents. The variations of pore water pressure and cyclic shear resistance were analysed. The calculation model of pore water pressure of saturated sand proposed by Seed and Finn could be applied to analyse the dynamic pore water pressure development of gravel steel slag. Compared with conventional soils, the cyclic liquefaction resistance of gravel steel slag is better than that of fine sand, gravel soil, sand-gravel soils and sand pebbles. Gravel steel slag can be used to replace some conventional cohesionless soils as a geo-backfill material.

摘要

由于环保政策下砂石的持续稀缺性，迫切需要一种具有良好抗液化性的新型土工回填材料。钢渣是一种工业固体废物。陈化八个月的钢渣通常可用作回填材料。研究钢渣的抗液化行为具有重要意义。根据土壤分类方法，废钢渣还分为砾石钢渣、粗钢渣和细钢渣。考虑固结应力比、加载频率、围压和砾石粒径含量等因素的影响，对本文中砾石钢渣的抗液化性能进行了动态三轴试验。分析了孔隙水压力和循环剪切阻力的变化。Seed和Finn提出的饱和砂体孔隙水压力计算模型可用于分析砾石钢渣的动态孔隙水压力发展。与常规土壤相比，砾石钢渣的抗循环液化性能优于细砂、砾石土、砂砾土和砂砾土。砾石钢渣可用于替代一些传统的无粘性土作为土工回填材料。