## 3 Results
### Analysis of Structural Changes in Loss Soil Samples
#### 3.2.3 Relationship Between Dry Density and Structural Parameter  
Soil is a collection of loose particles, and the connections between soil particles are much smaller than the connections between the particles themselves, so the strength of the soil is mainly determined by the interaction force between soil particles. Different dry densities of the same loess determine the size of the pore ratio and thus the force between particles. From another point of view, dry density also determines the degree of occlusion between soil particles. Dry density is one of the factors that influence the structural properties of the soil. The increase in density reduces the structural variability of the loess and increases its structural stability. The combined effect of these two factors ultimately results in structural changes. According to the triaxial test, the shear strength of undisturbed soil samples with different dry densities and saturated remolded soil was obtained, and their values were substituted into Formula (1) to obtain the corresponding structural parameter values. The calculation process and results are shown in Table 5, which is plotted as the change trend of structural parameter with dry density, as shown in Figure 5.  
As can be seen in Figure 5, the structural parameter decreases with increasing dry density. At low circumferential pressures (100-200 kPa), the structural parameter varies more with dry density and is highly sensitive to dry density. At high circumferential pressures (300-400 kPa), the structural parameter varies less with dry density and is less sensitive to dry density. Soils with low dry density have high pore ratios, low compaction, and higher structural stability corresponding to the particle bonding characteristics and structural variability corresponding to the particle arrangement characteristics of the soil. The combined structural potential released by the soil body under load, immersion, and disturbance is large, and the loss of structural strength corresponds to a large structural parameter. When the dry density of the loess is relatively high, the loess is more stable, the variability has been relegated to a secondary position, the void between the particles of the soil body is small, and the strength of the connection between the particles is low. At this time, the particle arrangement of the soil body is in a relatively stable state and the loess is weakly structured, corresponding to a small structural parameter. Overall, changes in loess dry density have a greater effect on loess structural variability than on stability. Therefore,  
Figure 5: Variation curves of structural parameter with dry density. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{2}{c}{\(\rho_{d}\) (g/cm\({}^{3}\))} & **1.28** & **1.35** & **1.36** & **1.41** & **1.42** \\ \hline \multirow{3}{*}{100} & \(\tau_{o}\)(kPa) & 135.61 & 141.33 & 142.22 & 147.02 & 148.99 \\ \cline{2-7}  & \(\tau_{rs}\)(kPa) & 37.88 & 40.15 & 43.58 & 48.52 & 50.85 \\ \cline{2-7}  & \(m_{\tau}\) & 3.52 & 3.52 & 3.26 & 3.03 & 2.93 \\ \hline \multirow{3}{*}{200} & \(\tau_{o}\)(kPa) & 220.15 & 233.58 & 236.16 & 256.39 & 254.02 \\ \cline{2-7}  & \(\tau_{rs}\)(kPa) & 66.31 & 72.54 & 79.31 & 94.26 & 95.14 \\ \cline{2-7}  & \(m_{\tau}\) & 3.32 & 3.22 & 2.98 & 2.72 & 2.67 \\ \hline \multirow{3}{*}{300} & \(\tau_{o}\)(kPa) & 292.91 & 320.36 & 324.27 & 341.73 & 339.86 \\ \cline{2-7}  & \(\tau_{rs}\)(kPa) & 96.67 & 105.38 & 116.67 & 130.43 & 133.28 \\ \cline{2-7}  & \(m_{\tau}\) & 3.03 & 3.04 & 2.78 & 2.62 & 2.55 \\ \hline \multirow{3}{*}{400} & \(\tau_{o}\)(kPa) & 414.12 & 420.05 & 415.37 & 430.37 & 430.97 \\ \cline{2-7}  & \(\tau_{rs}\)(kPa) & 140.38 & 145.85 & 154.38 & 170.78 & 175.19 \\ \cline{1-1} \cline{2-7}  & \(m_{\tau}\) & 2.95 & 2.88 & 2.69 & 2.52 & 2.46 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Shear Strength Values and Structural Parameter Values of Soil Samples with Different Dry Densities under Various Confining Pressures.