(Solved): 2. (18 points) A retaining wall is shown in Figure 1. Given: \( H=9 \mathrm{~m}, H_{1}=4 \mathrm{~m ...

2. (18 points) A retaining wall is shown in Figure 1. Given: \( H=9 \mathrm{~m}, H_{1}=4 \mathrm{~m} \), \( q=20 \mathrm{kPa}, \quad \eta=17 \mathrm{kN} / \mathrm{m}^{3}, c_{1}=12 \mathrm{kPa}, \varphi_{1}=24^{\circ} ; \quad \gamma_{\mathrm{sit}}=20 \mathrm{kN} / \mathrm{m}^{3}, \quad c_{2}=0, \varphi_{2}=30^{\circ} \), Determine the Rankine active earth pressure \( E_{\mathrm{a}} \), and the water pressure \( E_{\mathrm{w}} \), Draw the distribution curve of Rankine active earth pressure and pore water pressure, and calculate the total lateral pressure \( P_{\mathrm{L}} \). Figure 1