## 4 Analysis of Test Results
### Strength Performance Analysis  
The inorganic cementitious filling material, obtained by mixing and stirring base materials A and B along with the foaming agent, allows for observation and recording of the shape, foaming volume, and condensation time of the cementitious body through physical experiments. However, obtaining the compressive strength of the material requires conducting strength tests. Hence, for inorganic cementitious filling materials with varying ratios, strength tests are necessary. Only materials with a certain strength can effectively control the deformation of the roadway peripheral rock during mining operations. (1) Strength test analysis of the first group of specimens  
Three specimens were taken out from the filling materials obtained from the first group of experiments for compressive strength testing, and the loading method was force loading. The specimens are rectangular; the 1-3 specimen sizes were 5 cm \(\times\) 6 cm \(\times\) 6 cm, 5 cm \(\times\) 6 cm \(\times\) 6 cm, and 5 cm \(\times\) 6.8 cm \(\times\) 6 cm after 30 days of maintenance and measurement of its uniaxial compressive strength. Figure 9 shows the strength test curves of specimen numbers 1-3. Figure 9 illustrates the peak compressive strength of the specimens: No. 1 at 0.88 MPa, No. 2 at 0.68 MPa, and No. 3 at 0.92 MPa. The load-induced damage process of these specimens encompasses stages of pore compression, density, elasticity, and plasticity damage, stress peaking at the yielding stage, followed by specimen destruction and a rapid reduction of stress to zero. The stress-strain curve of Specim 1 exhibits a relatively smooth progression with an extended loading time, while Specimens 2 and 3 display notably similar stress-strain curves. Analyzing the deformation and damage characteristics of the specimens leads to the following conclusions: Specim 1 shows complete cracking at the top, with intertwined transverse and longitudinal cracks on the surface; Specim 2 features two longitudinal cracks in a 'Y' shape pattern along with a short longitudinal crack on the lateral side; Specim 3 primarily exhibits five longitudinal cracks under the applied pressure. Figure 8: Plasma foaming and coagulation time histogram. (2) Strength test analysis of the second group of specimens  
Three specimens were taken out from the filling materials obtained from the second group of experiments for compressive strength testing, and the loading method was force loading. The specimens are rectangular; the sizes of specimens 4-6 are 6 cm \(\times\) 7 cm \(\times\) 6 cm, 5 cm \(\times\) 6.4 cm \(\times\) 6 cm, and 5 cm \(\times\) 6 cm \(\times\) 6 cm, and their uniaxial compressive strength was measured after 30 days of maintenance. Figures 4-7 show the strength test curve of specimen numbers 4-6. In Figure 10, the peak compressive strength of the specimens is as follows: No. 4 at 0.71 MPa, No. 5 at 0.87 MPa, and No. 6 at 0.44 MPa. Specimens 4 and 5 initially undergo pore compression and density stages during loading, resulting in a compression-dense and closed internal pore structure. Subsequently, they enter the elastic-plastic stage, reach the yielding point, and ultimately deform and incur damage under peak stress conditions, retaining some residual strength. The loading curve of Specim 6 exhibits distinct differences, with a relatively short loading damage process and a comparatively lower compressive strength. Notably, when subjected to a 1 KN load, Specim 6 experiences a steep deformation decline, followed by a short period of stress reduction before slowly rising again until reaching the peak point. This phenomenon is presumed to occur due to the significant addition of B material, altering the internal structure of the specimen.