Development of a Model Material for Dynamic Geotechnical Model Tests

Abstract

To develop a model material suitable for analysing the stability of sandstone slopes during strong earthquakes, an orthogonal test was designed by selecting seven physico-mechemical parameters, a combination of dynamic and static parameters, as research indexes. Then, the influence of the proportion of each component in the model material on each test index was determined by sensitivity analysis, and the quantitative relationship between physico-mechanical parameters and component proportions was established by multiple linear regression analysis to develop a model material similar to sandstone. Finally, a sandstone slope along the Duxiang Expressway was taken as an example, and the proportions of the components suitable for a model of the rock mass in this area were determined. The test results showed that (1) the physico-mechanical parameters selected for the dynamic and static tests were used to effectively develop model materials for dynamic geotechnical model tests; (2) samples of model materials composed of barite powder, quartz sand, ferric powder, gypsum and cement met the requirements for dynamic testing of geotechnical models of sandstone slopes; and (3) through sensitivity analysis of various factors and multiple linear regression analysis, the required model materials were efficiently configured, and the failure mode, failure process and physico-mechanical parameters of the model materials accurately simulated the original rock materials.

Investigation of Sandstone-like Material for Damaged Rock Mass Based on Orthogonal Experimental Method

“…To ensure a clear understanding of the influence of each factor on the mechanical factors, we divided each factor into five grades. We combined this with the orthogonal test scheme used in previous investigations on rock-like materials [33,34]. Table 2 presents the orthogonal test scheme for the sandstone-like material ratio, while Table 3 shows the orthogonal test scheme for four factors and five levels.…”

Proportioning Test on the Similar Materials of the Rock Mass Physical Model Test Considering Seepage and Dynamic Characteristics

“…However, the above model tests only consider the permeability coefficient and the conventional physical and mechanical parameters. In terms of the dynamics of similar materials, Li et al [29] and Tian et al [30] conducted dynamic and static tests on rock samples composed of quartz sand, cement, and other materials but failed to deeply explore the hydrodynamic characteristics and the evolution law of dynamic parameters. At the same time, Cao et al [18] and Yang et al [31] designed and completed the shaking table model of slopes with weak interlayers under the action of rainfall.…”