## 3 Similar Simulation Test Analysis
### Comparative Experiments with Simulated Materials  
Similar material proportioning experiments were conducted in the laboratory based on the physical and mechanical parameters of the rock. The experimental materials included river sand as the aggregate, gypsum as the cementing material, and putty powder as the auxiliary material. The proportioning design scheme is detailed in Table 2.  
A mining pressure laboratory YA-600-type press was used to complete these experiments, with each group of proportioning numbers used to produce four standard test blocks for experiments, with test block holds made via homemade processing; this time, a total of 12 groups of proportioning numbers of test blocks were made, with a total of 48 standard test blocks, as shown in Figure 9. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Ratio Number** & **Sand** & **Gypsum** & **Putty Powder** & **Total Weight** \\ \hline
737 & 0.7 & 0.09 & 0.21 & 1.0 \\
837 & 0.8 & 0.06 & 0.14 & 1.0 \\
937 & 0.9 & 0.03 & 0.07 & 1.0 \\
9.537 & 0.95 & 0.015 & 0.035 & 1.0 \\
9.573 & 0.95 & 0.035 & 0.015 & 1.0 \\
9.555 & 0.95 & 0.025 & 0.025 & 1.0 \\
1037 & 1.0 & 0.03 & 0.07 & 1.1 \\
1055 & 1.0 & 0.05 & 0.05 & 1.1 \\
1073 & 1.0 & 0.07 & 0.03 & 1.1 \\
1173 & 1.1 & 0.07 & 0.03 & 1.2 \\
1155 & 1.1 & 0.05 & 0.05 & 1.2 \\
1137 & 1.1 & 0.03 & 0.07 & 1.2 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Similar material ratio number and material amount. Table 3 displays the uniaxial compressive strengths of specimen blocks made of similar materials with different ratio numbers. As shown in the table, specimen blocks with ratios of 737, 837, and 937 have higher compressive strengths due to the higher proportion of cementitious materials. This finding does not align with the required strength for the experiment. The table data show that as the gypsum content increases, the corresponding strength of the test block also increases. Additionally, the compressive strength of the specimen decreases as the sand content increases. The table indicates that the 1137 ratio specimen had the lowest strength at 0.15 MPa. Based on the previous section's analysis of the strength of the similar ratio of 1:300, it is evident that the specimen's uniaxial strength is comparable to that of the actual ore body and the peripheral rock when the ratio is 11:37, 11:5:5, or 11:7:3. Therefore, we have selected 11:37, 11:5:5, and 11:7:3 as the similar simulation materials for the lower disk enclosure, ore body, and upper disk enclosure, respectively, in accordance with the test requirements. Table 3 presents the uniaxial compressive strengths of specimen blocks made of similar materials with varying ratio numbers. The data in the table reveal that specimen blocks with ratios of 737, 837, and 937 exhibit higher compressive strengths attributed to their elevated proportion of cementitious materials. However, this finding deviates from the \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**No**} & \multirow{2}{*}{**Ratio**} & \multirow{2}{*}{**Compressive**} & \multicolumn{2}{c}{**Average**} & \multirow{2}{*}{**No**} & \multirow{2}{*}{**Ratio**} & \multirow{2}{*}{**Compressive**} & \multirow{2}{*}{**Average**} \\  & & & & & & & & **Compressive** \\  & **Number** & & & & & & **Strength/MPa** & **Strength/MPa** \\ \hline  
& 0.45 & & 46 & & 0.13 & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Comparative test results of similar materials. Figure 9: Standard specimens. required strength for the experiment. Notably, an increase in gypsum content correlates with an increase in the strength of the test block, while a rise in sand content leads to a decrease in compressive strength. Specifically, the specimen with a ratio of 1137 exhibits the lowest strength at 0.15 MPa. Building on the analysis from the preceding section regarding the strengths of similar ratios at 1:300, it becomes apparent that the uniaxial strength of the specimen aligns with that of the actual ore body and surrounding rock when the ratio is set at 11:3:7, 11:5:5, or 11:7:3.