The Application of Underwater Pressuremeter Test to In-situ Testing of Bridge Foundation

摘要

The Menard pressuremeter test can be successfully performed at any depth, this pressuremeter (designated by PMT) has a greatest advantage for seabed and other underwater tests from floating platforms, since there is no need for a stiff linkage between the probe and the drilling platform. In-situ test of a bridge foundation ground, envolving underwater sedimentar soft clay and sand by using GA pressuremeter, is introduced. Based on the interpretation of drill borehole geologic data, a linear relationship between standard penetration test values (N_(63.5)) and bearing capacity of foundation based on pressuremeter test was assumed. The correlation between N_(63.5) and bearing capacity of foundation derived from PMT are different because of the difference of soil properties. For hard soil foundation, the increasing degree of bearing capacity of foundation calculated from pressuremeter test with N_(63.5) is small. And the increasing degree of bearing capacity of foundation calculated from pressuremeter test with N_(63.5) is rather large for soft soil foundation. It can be well used for ascertaining the ground bearing capacity by SPT and partial pressuremeter test data and determining the position of supporting course.