用扁铲侧胀试验求解侧向基床反力系数

Calculation of the horizontal coefficient of subgrade reaction with the flat dilatometer test

侧向基床反力系数Kh是水平受荷桩、基坑围护和隧道支护设计的一个重要参数。从扁铲侧胀仪的工作机理出发,推导出侧向基床反力系数的计算公式,并考虑了基础宽度、加荷速率、基础形状及刚柔性等因素的影响。利用上海地区的扁铲侧胀试验资料,按本文公式进行计算,结果与规范推荐值相当接近。

The horizontal coefficient of subgrade reaction,Kh, plays a significant role in problems dealing with laterally or loaded piles, excavation and tunnel engineering. The calculation formula for the horizontal coefficient of subgrade reaction is derived from the principle of the flat dilatometer test. And the influence factors of Kh, such as the width and shape of foundation, the rigidity and plexibility of the foundation and the rate of loading are considered respectively.then,the values of Kh are obtained from the calculation formula according to the data of insitu DMT in Shanghai,and the calculated values of Kh are almost equal to those suggested in the code.