基于无拉力Winkler地基梁的原位测试方法

基于梁与无拉力Winkler地基的相互作用,提出一种用于测试基床系数的岩土工程原位测试新方法,对现有测试技术进行补充和发展。在无拉力Winkler弹性地基梁中点处作用一个垂直于地面的集中力,通过测量集中力作用点处的弯矩和垂直于地面的位移,反推出地基的基床系数。讨论测试梁的尺寸和制作材料,介绍试验数据的处理方法。理论计算表明,梁与地基的相互作用范围只与地基系数相关,与力的大小无关,据此可验证测试梁的长度是否符合测试要求,确保测试结果的精确度。

In-situ Testing Method for Tensionless Winkler Foundation Beams

Based on the interaction of the beam and the tensionless Winkler foundation,a new method for in-situ testing of the coefficient of sub-grade reaction is proposed to supplement and develop the existing test technology. A concentrated force is acted on the midpoint of the beam on tensionless Winkler foundation to deduce the coefficient of sub-grade reaction by measuring the bending moment and the vertical ground displacement at the point of the force. The proper material and size about the tested beam are discussed,including the method of processing testing data. The results indicate that the interaction range between the beam and the foundation is only related to the coefficient of sub-grade independent of the force scale,which can be used to verify the compliance of the length of the tested beam with test requirement and ensure measurement accuracy.