水泥土细观破裂过程的实时观测试验

Real-Time Observation on the Meso-Fracture Process Testing of Cemented Soil

利用中科院武汉岩土力学研究所的岩石破裂过程细观力学实验系统,对不同水泥掺量的水泥土试件进行了单轴压缩细观实验,该试验系统可通过显微镜和数码视频装置实时观测水泥土试件的细观结构及其破坏的全过程,试验得到了水泥土破裂过程中的细观图像及其相应应力应变关系曲线。分析了不同水泥掺量的水泥土试件的细观破坏特征及其与宏观力学行为的关系,研究为水泥土细观损伤本构模型的建立提供了实验依据。

Using the rock meso-mechanics experimental system provided by the Key Laboratory of Rock and Soil Mechanics affiliated to Wuhan Institute of Rock and Soil Mechanics, China Academy of Sciences, a uniaxial compression experiment was conducted in order to investigate the fracturing behaviors of cemented soil with different content of cement. The meso-fracturing process of cemented soil was real-time observed by using the microscope and the digital colorful camera. Stress-strain curves and corresponding micro-images of specimen＇s failure process have been obtained. The relation between meso-fracturing process and macro-mechanical behavior were studied for cemented soil with different content of cement. Results presented in this paper can be used as experimental evidence for setting up the constitutive model of meso-damage.