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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E_0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E_0比柔性承载板测试出的E_0偏大14.0%,有限元模拟同样也表明刚性承载板测试出的E_0偏大10%以上,采用柔性承载板可得到E_0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。
At present, the load-bearing plates used in PLT are all rigid load-bearing plates, and the actual distribution of plate-bottom pressure can not be considered. There is a certain deviation in the deformation modulus E_0 of the foundations. In order to achieve a uniform load on the bottom of the board, an air bag is added under the rigid support board to develop a flexible support board suitable for PLT. When using the flexible bearing plate test, the internal deformation of the airbag is measured by an inductive displacement sensor, and the load values at all levels are controlled simultaneously by the resultant force P and the air pressure p in the capsule. The results of indoor comparison test show that the E_0 measured by the rigid bearing plate is 14.0% larger than the E_0 measured by the flexible bearing plate. The finite element simulation also shows that the E_0 measured by the rigid bearing plate is larger by more than 10%, and the flexible bearing plate Get the exact value of E_0. It is considered that the flexible load-bearing plate test method of soil deformation modulus is feasible and advanced, and the cost and efficiency are completely acceptable.