Zhu Luo’s scientific contributions

In filling engineering, the mechanical properties of geomaterials are the most important mechanical indicators. With the improvement of the measurement technology, the falling ball test (FBT) method has been gradually popularized and applied to the testing of geomaterials mechanical properties. In order to verify the testing accuracy of the FBT method, experimental results of the deformation modulus tested for the homogeneous fine-grained materials and the layered structures using the FBT method are compared with the K 30 plate load test, which is the earliest and the most widely used in-situ test method. And some conclusions are drawn in this present paper.

The detection of the deformation characteristics of geotechnical materials is very important for improving the safety of highways. With the improvement of the detection technology, the falling ball test (FBT) method has been gradually applied to measure mechanical properties of the geomaterials. In order to determine the reliability and the stability of the FBT method, the results of using the FBT method to detect the deflection value of the cement stabilizing layer are compared in this paper with the results of using a falling weight deflectometer (FWD), which is recognized worldwide as an ideal non-destructive detection equipment for the road mechanical performance. It is found that FBT method has high stability and reliability during the test.

Through the experiment, the deflection detection methods of the falling-ball instrument and the falling weight deflect meter (FWD) were compared, and their correlations were analyzed. The results show that the test depth and range of FWD are larger than the falling-ball instrument, and there is a good linear relationship between the road surface deflection values measured by the falling-ball instrument and FWD.