摘要
岛礁工程中常规模化采用冲击法加固钙质砂砾回填料地基。对钙质砂砾试样进行冲击试验,研究不同总冲击能对试样颗粒级配、变形、颗粒破碎的影响,结果表明:随着总冲击能的增大,试样孔隙比逐渐减小,并最终呈稳定趋势,二者满足指数函数关系;试样相对破碎率随总冲击能的增大而逐渐增大,但存在一临界总冲击能,超过该值后,相对破碎率增幅逐渐减弱;冲击能能改变试样粒径的构成,其不均匀系数、曲率系数随总冲击能增大而增大,并呈二项式函数关系;试样平均粒径随总冲击能的增大而减小,二者呈线性负相关;钙质砂砾经过冲击作用后,粒组百分含量变化较为明显,含砂量增大,砂砾比例发生变化,其中原粒组下一级粒径区间质量百分含量增量尤为明显。利用钙质砂砾进行规模化地基填筑时,应充分考虑冲击能对其颗粒级配、砂砾比变化的影响,选择合理的施工工艺。
The effect of different impact energy E on the mechanical composition, deformation and grain breakage of the calcareous sandy was studied by impact test. The results showed that with the increase of the total impact energy, the void ratio of the specimen decreased gradually and finally tended to be stable. Both of them content the exponential function. The relative grain breaking ratio of the specimen mechanical composition increased gradually with the total impact energy. The impact energy had an effect on the specimen mechanical composition, and its nonuniform coefficient Co and the curvature coefficient Cc were related with the total impact energy, Cu and C increased with the total impact energy E increased by the binomial function. The average particle size d50 of the specimen decreased with the increase of the total impact energy E, which was a linear negative correlation. After the impact of calcareous sandy gravel, the content of sand increased, the proportion of sand and gravel changed, and the change in the next smaller grain diameter range than the primary grain diameter range was more obvious. When the foundation was filled with calcareous sandy gravel, the effect of impact energy on the mechanical composition should be taken into full consideration, and the reasonable construction technique should be selected.
出处
《工业建筑》
CSCD
北大核心
2017年第5期96-100,157,共6页
Industrial Construction
基金
国家重大科学研究计划(2013CB956104)
国家自然科学基金重点项目(41330642)
国家自然科学基金面上项目(41372316)
关键词
冲击作用
钙质砂砾
颗粒级配
地基处理
颗粒破碎
impact effect
calcareous sandy gravel
mechanical composition
foundation treatment
grain breakage
