## 5 Application Case
### Results of the Simulation  
#### 5.3.1 The Simulated Parameters  
The iterative search process for the optimal calcium leaching parameters was carried out through GA, SA, SSA, and PSO, respectively. In the GA strategy, the population size is 40 and the termination evolution algebra is 200. The crossover and mutation probability are 0.7 and 0.01, respectively. In the SA strategy, the maximum number of iterations is 100, the temperature attenuation coefficient is 0.95, the initial temperature is 100, and the minimum temperature is 1 \(\times\) 10\({}^{-6}\). In the SSA strategy, the number of sparrows is 50, the proportion of discoverers is 0.7, the proportion of followers is 0.1, the proportion of vigilants is 0.2, the maximum number of iterations is 200, and the safety threshold is 0.6. In the PSO strategy, the updated speed of the particle is the sum of its own speed inertia, self-cognition, and social cognition in the previous step. The initial population number is 20, the maximum number of iterations is 200, and the inertia weight is 0.8. The first and second learning factors are 1.5 and 1.5, respectively.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Material** & **Parameter** & **Notation** & **Value** \\ \hline Rock & Bulk density & \(\gamma_{r}\) & 25.40 kN/m\({}^{3}\) \\ Rock & Initial porosity & \(\varphi_{f}\) & 0.10 \\ Rock & Initial diffusivity & \(D_{r0}\) & 1.47 \(\times\) 10\({}^{-11}\) m\({}^{2}\)/s \\ Concrete & Bulk density & \(\gamma_{c}\) & 23.51 kN/m\({}^{3}\) \\ Concrete & CH content & C\({}_{c,CH}\) & 3027 mol/m\({}^{3}\) \\ Concrete & CSH content & C\({}_{c,CH}\) & 6054 mol/m\({}^{3}\) \\ Concrete & Initial porosity & \(\varphi_{0}\) & 0.10 \\ Concrete & Initial diffusivity & \(D_{c0}\) & 7.10 \(\times\) 10\({}^{-12}\) m\({}^{2}\)/s \\ Impervious curtain & CH content & \(C_{CH}\) & 3027 mol/m\({}^{3}\) \\ Impervious curtain & CSH content & \(C_{CSH}\) & 6054 mol/m\({}^{3}\) \\ Impervious curtain & Initial porosity & \(\varphi_{0}\) & 0.15 \\ Impervious curtain & Initial diffusivity & \(D_{0}\) & 9.87 \(\times\) 10\({}^{-12}\) m\({}^{2}\)/s \\ Impervious curtain & Intact/leached bulk density & \(\rho_{0}\)/\(\rho_{L}\) & 30.6/145.8 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Calculation parameters of rock and grout curtain.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Skeleton** & **Ca\({}^{\text{2+}}\)** & **ds\({}_{Ca}\)/d\({}_{Ca}\)** & **Diffusivity** & \(\tau_{\text{\emph{lench}}}\) & \(\frac{1}{\tau}\) \\
**Compound** & **(mol/m\({}^{3}\))** & **ds\({}_{Ca}\)/d\({}_{Ca}\)** & **(m\({}^{2}\)/s)** & **(s)** & **(mol/(J\(\cdot\)s))** \\ \hline CH & 19–22 & 2142 & 1.47 \(\times\) 10\({}^{-9}\) & 1.17 \(\times\) 10\({}^{4}\) & 3.45 \(\times\) 10\({}^{-8}\) \\ C-S-H & 2–19 & 203 & 1.62 \(\times\) 10\({}^{-9}\) & 5.88 \(\times\) 10\({}^{2}\) & 7.00 \(\times\) 10\({}^{-9}\) \\ C-S-H & 0–2 & 1910 & 1.83 \(\times\) 10\({}^{-9}\) & 6.52 \(\times\) 10\({}^{3}\) & 6.20 \(\times\) 10\({}^{-8}\) \\ \hline \hline \end{tabular}
\end{table}
Table 3: Parameters for the solid-phase calcium disequilibrium decomposition model.  
Table 4 lists the calculated calcium leaching parameters of the impervious curtain at the initial moment. The calculated values of \(\Omega_{0}\), \(n\), and \(k_{r}\) are within the corresponding parameter ranges.