ORIGINAL POSITION EXAMINATION METHOD AND EXAMINATION DEVICE TO FIND YOUNG'S MODULUS OF NONVISCOUS FOUNDATION BY FREEZING ORIGINAL POSITION FOUNDATION

摘要

PURPOSE:To make the original position examination easy by freezing the original position foundation, inserting a rubber balloon structure of examination device, and after the foundation is melted, applying a pressure to the rubber balloon to deform the foundation in the radius direction. CONSTITUTION:To a non-viscous ground foundation 1, a freezing tube is set and frozen in the one-dimension condition, and an excavation is made by a core tube to set a casing pipe 8. Then, a rubber balloon structure of examination device 9 is inserted in a hole 7 for excavation up to the excavating position, and after the frozen foundation 3 is melted perfectly, a pressure is applied to a rubber balloon 40 to push and depress the original position foundation 1 in the radious direction. Then, the pressure increase amount H at the time is read as the water level difference of a water head tube 55, and the foundation deformation amount L is measured by converting the H into the volume. Consequently, the Young's modulus in the horizontal direction can be measured without giving a disturbance to the foundation of the non-viscous ground foundation.