## 3 Experimental Results and Discussion
### The Influence of MSW Characteristics on the MPCI  
(1) The Influence of Temperature on the MPCI  
Figure 6 shows the change rule of the modified primary compression index (\(C_{c}^{\prime}\)) with the change in temperature (\(T\)): \(C_{c}^{\prime}\) shows an upward trend as \(T\) rises. When the temperature increased from 20 \({}^{\circ}\)C to 40 \({}^{\circ}\)C, \(C_{c}^{\prime}\) had an increase of 6.6% from 0.135 to 0.144 in L-MSW; the fitting equation is \(C_{c}^{\prime}\) = 0.00045\(T\) + 0.1275 and the fitting degree is \(R^{2}\) = 0.75. When the temperature increased from 20 \({}^{\circ}\)C to 40 \({}^{\circ}\)C, \(C_{c}^{\prime}\) had an increase of 13.27% from 0.211 to 0.239 in M-MSW; the fitting equation is \(C_{c}^{\prime}\) = 0.001757 + 0.2245 and the fitting degree is \(R^{2}\) = 0.9784. When the temperature increased from 20 \({}^{\circ}\)C to 40 \({}^{\circ}\)C, \(C_{c}^{\prime}\) had an increase of 13.41% from 0.261 to 0.29 in H-MSW; the fitting equation is \(C_{c}^{\prime}\) = 0.00147 + 0.182 and the fitting degree is \(R^{2}\) = 0.9932. The MPCI (\(C_{c}^{\prime}\)) of MSW with the same organic matter content (\(OW\)) increased when the temperature increased. Under the same variables, the increase rate of the MPCI is faster when the organic matter content is higher. Thus, it could be seen that the MPCI is more sensitive to temperature changes than organic matter content changes. The influence of temperature on MSW compression is as follows: the sensitivity of organic matter particles to temperature was higher than that of inorganic matter particles, and the particles of MSW showed obvious softening characteristics when the temperature increased, so an increase in temperature will increase the settlement of MSW. (2) The Influence of Dry Unit Weight on the MPCI  
Figure 4: Consolidation curve of M-MSW under 30 \({}^{\circ}\)C and 100 kPa stress. Figure 7 shows the change rule of the MPCI (\(C_{c}^{\prime}\)) with a change in dry unit weight (\(\gamma_{d}\)) at different temperatures. \(C_{c}^{\prime}\) showed a negative correlation with \(\gamma_{d}\); that is, as \(\gamma_{d}\) increased, \(C_{c}^{\prime}\) decreased when the other variables were the same. As the dry unit weight increased from 4.704 kN/m3 to 6.586 kN/m3, \(C_{c}^{\prime}\) decreased from 0.235 to 0.167 when the temperature was 20 \({}^{\circ}\)C; the fitting equation is \(C_{c}^{\prime}\)\(=-0.036\gamma_{d}\) + 0.408 and the fitting degree is \(R^{2}\) = 0.9948. As the dry unit weight increased from 4.704 kN/m3 to 6.586 kN/m3, \(C_{c}^{\prime}\) decreased from 0.247 to 0.18 when the temperature was 30 \({}^{\circ}\)C; the fitting equation is \(C_{c}^{\prime}\)\(=-0.0358\gamma_{d}\) + 0.417 and the fitting degree is \(R^{2}\) = 0.9956. As the dry unit weight increased from 4.704 kN/m3 to 6.586 kN/m3, \(C_{c}^{\prime}\) decreased from 6.586 kN/m3, \(C_{c}^{\prime}\) decreased from 259 to 0.194 when the temperature was 40 \({}^{\circ}\)C; the fitting equation is \(C_{c}^{\prime}\)\(=-0.0349\gamma_{d}\) + 0.426 and the fitting degree is \(R^{2}\) = 0.9956. From Figure 6, it can be seen that the MPCI lines of samples with different dry unit weights and at different temperatures are parallel to each other; that is, as \(\gamma_{d}\) changed, the trends of \(C_{c}^{\prime}\) remained relatively similar under different temperatures. There was a significant linear relationship between the MPCI and the dry unit weight. Figure 5: _Cont._  
The mechanisms by which dry unit weight affects the MPCI are as follows: 1. The greater the dry unit weight of the sample, the less the proportion of light components in the sample and the greater the proportion of heavy components, resulting in a lower compressibility of MSW. 2. The greater the dry unit weight of the sample, the smaller the void ratio and the lower the compressibility of MSW. (3) The Influence of Organic Matter Content on the MPCI  
Figure 8 shows the change rule of the MPCI with a change in organic matter content (\(OW\)) at different temperatures.