水下旁压试验在桥基原位测试中的应用

介绍了GA型预钻式旁压仪在水下沉积软土及砂土桥基原位测试中的成功应用。试验结果表明: 由旁压试验结果推求的地基承载力与标准贯入击数具有良好的线性关系, 随着标贯击数N_63.5的增大, 土质较硬的地基的承载力增长的幅度小; 而土质较软的地基的承载力增长的幅度反而大。为利用标贯试验和部分旁压试验结果能够较为准确地推求地基承载力, 确定持力层位置, 提供了依据。 

The application of underwater pressuremeter test to in-situ testing of bridge foundation

In-situ measurement of bridge foundation located underwater sediment soft clay and sand by using GA pressuremeter is introduced. The results of test show that it is linear relationship between the ground bearing capacity calculated by pressuremeter test and standard penetration test(SPT). The increasing degree of the ground bearing capacity of hard stratum is slow with the increasing of N (63.5), but that of soft ground is fast with the increasing of N (63.5). It can be well used for nicety ascertaining the ground bearing capacity by SPT and partial pressuremeter test data and determining the position of supporting course.