真空或堆载荷载作用下土体变形对比试验研究  

Comparative Research on the Deformation Characteristics of Soil Under Vacuum Loading or Surcharge Loading

作　　者：颜立明 刘宝石 YAN Liming;LIU Baoshi(China Shipbuilding Industry Institute of Engineering Investigation and Design Co.,Ltd.,Shanghai 200063,China)

机构地区：[1]中船勘察设计研究院有限公司,上海200063

出　　处：《水利与建筑工程学报》2020年第2期71-75,共5页Journal of Water Resources and Architectural Engineering

摘　　要：针对目前真空预压的沉降计算参数仍然通过常规单向压缩回弹试验获得的问题,设计了相同试验条件下土体在真空荷载或堆载荷载作用下变形特性的对比试验,探讨堆载与真空荷载作用下土体压缩回弹参数之间的定量关系。试验结果标明:堆载试验中土体的压缩指数为真空试验中土体的压缩指数的1.09倍~1.23倍,堆载试验的回弹指数为真空试验的9.55倍~12.74倍。试验结果改进了真空预压沉降计算参数的取值方法,提高了真空预压地基变形的计算精度。A comparative test of deformation characteristics of soil under vacuum or pile load under the same test conditions is designed, and the approximate quantitative relationship of the compression rebound parameters of soil between surcharge loading and vacuum loading is discussed on the basis of the problem that parameters in settlement calculation for vacuum preloading are still based on the conventional one-way compression rebound test at present. The test results show that the compression index of the soil in the pile-up test is 1.09~1.23 times as large as the compression index of the soil in the vacuum test, and the rebound index of the pile-up test is 9.55~12.74 times as large as that of the vacuum test. According to the test results, the method of determining parameters in settlement calculation for vacuum preloading is improved, and the calculation accuracy of settlement calculation for vacuum preloading is enhanced.

关 键 词：真空预压法 真空荷载 堆载荷载 卸荷变形 对比试验 

分 类 号：TU472.33[建筑科学—结构工程]