用超细水泥灌浆加固地基在美国弗吉尼亚州的克里斯特尔城，其中心广场的商业发展计划，要求在一个原有的露天溜冰场上架设屋顶，所以增大了基础的荷载。支承基础的是一种级配不良的细至中砂。砂土中含有６～１８％极细的砂子；标准贯入试验的锤击次数为１１～１６次。原来... Reinforcing the foundation with ultra-fine cement grouting In Crystal City, Virginia, the commercial development plan for the central plaza requires the erection of a roof on an existing open-air skating rink, thereby increasing the underlying load. The support is based on a fine-to-medium sand with poor grading. Sand contains 6 to 18% of fine sand; the standard penetration test has 11 to 16 hammer strokes. original...