同步爆扩法处理高速公路液化土地基模型试验研究

为了获得同步爆扩法处理高速公路液化土地基的现场试验的实施方法和参数，验证理论研究成果，设计了模型试验装置，采用模型试验和对比分析相结合的研究方法，研究了爆扩参数及影响因素、爆扩应力变化规律、爆扩超孔隙水压力变化规律、爆扩排水沉降的规律，提出了现场试验的技术参数和实施方法．结果表明：土体爆扩应力影响范围为6m，土体爆扩性指标为0．5m^3／kg，爆扩后地面沉降达到200-300mm，土体物理力学性能提高，液化消失．

Model Test Study on Treatment of Liquefaction Soil Foundation with Synchronous Blast-enlargement in Expressway

A group of model tests were conducted to obtain the constructing method and the parameters on treatment of the liquefaction soil foundation with the synchronous blast-enlargement in field test, to verify results of theoretical study. The parameters and their influence factors, the rules of the stesses and the excess pore water pressure, the drainage settlement were studied in special model test equipment. The constructing method and the parameters of field test were proposed. The results show that the affecting scope of the soil blast-enlargement stress is 6 m, the blast-enlargement index is 0.5 mS/kg approximately, the settlement is 200 to 300 mm, the physical and mechanical characteristics of soil are improved and the liquefaction of soil disappear after treatment.