## 3 Experimental Results and Discussion
### The Influence of MSW Characteristics on the MPCI
\(C^{\prime}_{c}\) increased with the increase in \(OW\) under different temperatures when the other variables were the same. As \(OW\) increased from 30% to 80%, \(C^{\prime}_{c}\) increased from 0.167 to 0.235 when the temperature was 20 \({}^{\circ}\)C; the fitting equation is \(C^{\prime}_{c}=0.00137 OW+0.127\) and the fitting degree is \(R^{2}=0.9972\). As \(OW\) increased from 30% to 80%, \(C^{\prime}_{c}\) increased from 0.18 to 0.247 when the temperature was 30 \({}^{\circ}\)C; the fitting equation is \(C^{\prime}_{c}=0.00135 OW+0.141\) and the fitting degree is \(R^{2}=0.9977\). As \(OW\) increased from  
Figure 5: MSW primary compression strain and vertical stress under different temperatures. Figure 6: Change rule of MPCI for different organic matter contents at different temperatures. 30% to 80%, \(C^{\prime}_{c}\) increased from 0.194 to 0.259 when the temperature was 40 \({}^{\circ}\)C; the fitting equation is \(C^{\prime}_{c}=0.00132 OW+0.156\) and the fitting degree is \(R^{2}\) = 0.9893. The influence of \(OW\) on the MPCI is as follows: the number of compressible particles in MSW increases as the organic matter content increases; thus, the compressibility of MSW is enhanced. (4) The Influence of moisture content on a wet basis according to the MPCI  
Figure 9 shows the change rule of the MPCI (\(C^{\prime}_{c}\)) for moisture content on a wet basis (\(\omega_{w}\)) at different temperatures. \(C^{\prime}_{c}\) increased with the increase in \(\omega_{w}\) at different temperatures when the other variables were the same. As \(\omega_{w}\) increased from 51.64% to 59.61%, \(C^{\prime}_{c}\) increased from 0.154 to 0.162 when the temperature was 20 \({}^{\circ}\)C; the fitting equation is \(C^{\prime}_{c}=0.0134\omega_{w}-0.53726\) and the fitting degree is \(R^{2}\) = 0.9877. As \(\omega_{w}\) increased from 51.64% to 59.61%, \(C^{\prime}_{c}\) increased from 0.166 to 0.274 when the temperature was 30 \({}^{\circ}\)C; the fitting equation is \(C^{\prime}_{c}=0.01344\omega_{w}-0.52526\) and the fitting degree is \(R^{2}\) = 0.9891. As \(\omega_{w}\) increased from 51.64% to 59.61%, \(C^{\prime}_{c}\) increased from 0.169 to 0.296 when the temperature  
Figure 8: Change rule of MPCI for organic matter content at different temperatures. Figure 7: Change rule of MPCI for different dry unit weights at different temperatures. was 40 \({}^{\circ}\)C; the fitting equation is \(C_{c}^{\prime}=0.01574\omega_{w}-0.64628\) and the fitting degree is \(R^{2}=0.9929\). The influence of \(\omega_{w}\) on the MPCI is as follows: 1. Water can soften some components of MSW to increase the compressibility of MSW. 2. Water can allow the skeleton particles of MSW to move easier, which provides a certain degree of lubrication between skeleton particles. Above all, temperature (\(T\)), dry unit weight (\(\gamma_{d}\)), organic matter content (\(OW\)), and moisture content (\(\omega_{w}\)) all have an impact on the Modified Primary Compression Index (\(C_{c}^{\prime}\)) of MSW. The higher the temperature (\(T\)), the smaller the dry unit weight (\(\gamma_{d}\)), the higher the organic matter content (\(OW\)), the higher the moisture content on a wet basis, and the greater the Modified Primary Compression Index (MPCI) of MSW. Therefore, this article establishes a regression model that considers the influence of multiple factors to describe the change rule of the MSW MPCI.