【摘要】 目前平板载荷试验（PLT）所用的承载板均为刚性承载板,无法考虑板底压力实际分布,测试出的地基土变形模量E₀存在一定的偏差。为实现板底均匀加载,在刚性承载板下加装气囊,研制出一种适用于PLT的柔性承载板。采用柔性承载板测试时,气囊内部变形量由电感式位移传感器测出,各级载荷值由合力P与囊内气压p同时控制。室内对比试验结果表明,刚性承载板测试出的E₀比柔性承载板测试出的E₀偏大14.0%,有限元模拟同样也表明刚性承载板测试出的E₀偏大10%以上,采用柔性承载板可得到E₀的准确值。研究认为土体变形模量的柔性承载板测试法具有可行性和先进性,成本及效率方面完全可以接受。更多还原

【Abstract】 At present, all bearing plates used in plate loading test（PLT） are rigid, which leads to a certain error in deformation modulusE₀ of the foundation soil due to without considering the actual distribution of the compressive stress under the plates. In order to realize a uniform load under the plate, a flexible bearing plate has been invented through the installation of an air bag under the traditional rigid bearing plate and has been proved applicable for PLT. During the PLT using the flexible bearing plate, the internal deformation of the air bag can be measured with the help of the inductance meter and the self-made sensor; and the load value at all levels is controlled by the resultant P and the air pressure p simultaneously. The indoor comparative test results show that the tested E₀ using the rigid bearing plate is about 14.0% larger than ones by using flexible bearing plate. The finite element method simulation also shows that the tested E₀ using the rigid load bearing plate is at least 10% larger than ones using the flexible load bearing plate; and an accurate E₀ can be get using the flexible bearing plate. So it can be concluded that the testing method for the foundation soils deformation modulus using flexible bearing plate is feasible and advanced; and the cost and efficiency can be fully accepted.更多还原