土变形模量的柔性承载板测试研究

发布时间：2018-02-21 02:26

本文关键词： 变形模量柔性承载板平板载荷试验试验研究　出处：《岩土力学》2017年S1期 　论文类型：期刊论文

【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。
[Abstract]:At present, the load-bearing plates used in the plate load test (PLT) are all rigid load-bearing plates, which can not consider the actual distribution of the plate bottom pressure. The deformation modulus E _ 0 of the tested foundation soil has a certain deviation. In order to realize the uniform loading of the slab bottom, A flexible bearing plate suitable for PLT is developed by adding air bag under rigid bearing plate. When the flexible bearing plate is tested, the internal deformation of the airbag is measured by inductive displacement sensor. The load values of all levels are controlled by the resultant force P and the pressure p in the capsule at the same time. The results of indoor comparative tests show that, Compared with that tested by flexible load-bearing board, the E _ 0 of rigid bearing plate is 14.0 larger than that of flexible bearing board. The finite element simulation also shows that the E _ 0 measured by rigid bearing plate is more than 10%. The accurate value of E _ 0 can be obtained by using flexible bearing plate. It is considered that the flexible bearing plate test method of soil deformation modulus is feasible and advanced, and the cost and efficiency are completely acceptable.
【作者单位】：重庆科技学院建筑工程学院;重庆交通大学水利水运工程教育部重点实验室;
【基金】：国家自然科学基金项目(No.51609027) 重庆市基础与前沿研究计划项目(No.cstc2015jcyjA30002,No.cstc2015jcyjA30003) 重庆市城乡建设委员会资助项目(城科字2011第(84)号) 国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金资助项目(No.SLK2014B02)~~
【分类号】：TU43

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