在岩土力学与工程领域,随着对土压力荷载大小与分布研究的深入,新型土压力传感器的研发愈显重要.本文利用导电敏感复合材料研制了一种新型薄膜式土压力分布传感器,其总厚度小于0.2 mm.首先介绍了传感器的设计原理及结构,初步测试结果表明,双层结构传感器的灵敏度相对更高.然后,通过大型模型试验实测检验了研发的双层结构土压力分布传感器的基本性能.新型传感器具有测点面积小(可实现大密度测试)、T/D小(对土体扰动小)、引线方便以及弯曲挠度大(适合弯曲表面压力测试)等特点.综合来看,它用于土压力分布测试初步是可行的,具有进一步深入研究的价值.%With the advances in the Geotechnical mechanics and Engineering,the research and development on new earth pressure sensors are becoming more and more important. The current study developed a thin-film soil pressure distribution test sensor-overall thickness was less than 0. 2 mm, by composite materials. The study introduced the structure and mechanism of the sensor and conducted a pretest on its sensitivity. It was shown that double-layer structure sensor had higher sensitivity. Moreover, the basic performances of the sensor were tested through large-scale model experiment,which demonstrated that the sensor was reliable. The thin-film sensors can be applied into soil pressure cell as its advantages include the smaller size( large density test) ,the smaller T/D( less disturbance to soil) ,convenient wire layout and large deflection bending( suitable for curved surface) and the like.
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