水泥砂浆试件单轴压缩光纤光栅检测实验

Experiment of Cement Mortar Specimen Uniaxial Compression by Fiber Bragg Grating Detecting

为了检测岩层内部变形及其发展过程,采用埋入光纤Bragg光栅传感器的方法对水泥砂浆试件变形进行监测。制作了9种配比,36个试件,在实验室分别用MTS-815伺服试验机和WE-30型万能材料试验机进行了单轴压缩实验,并对3个埋有光纤光栅传感器的水泥砂浆试件作了深入分析。研究表明,埋入试件内部的光纤传感器在变形范围内能反映出试件内部的摩擦、滑移等现象;灰砂比为1,水灰比为0.5时抗压强度和弹性模量最大,泊松比差别很小,且无论水灰比怎么变化,试件都有抗压强度和弹性模量减小,泊松比增大的趋势;得出了最有利的封孔砂浆配比。

In order to detect internal deformation and development process of rock strata, the article used embedded optical fiber Bragg grating sensor to detect cement mortar specimen deformation. In order to find out best cement proportioning, 36 testing samples for 9 kinds of ratio were made. All samples were tested by uniaxial compression experiment with MTS -815 servo tester and WE -30 type universal testing machine in the laboratory. Three samples which were buried with fiber Bragg grating sensor in the cement were analyzed. The results showed that the buried fiber sensors could give accuracy results about internal friction, slip phenomenon in cement specimen. When sand cement ratio was 1 and water cement ratio was 0.5, the compressive strength and the elastic modulus reached maximum, but Poisson~ ratio had little difference compared with other composition. No matter how water - cement ratio changed, sample＇s compressive strength and elastic modulus decreased and Poisson＇s ratio increased, the best cement mortar proportioning was obtained for drilling sealing.