## 4 Results and Discussion
### Test Section
#### 4.2.4 Observation of Greening Effect of Test Slope  
From the greening effect diagrams of Figures 15 and 16, it was found that most shrubs and grasses grow well and the plants on the test slope treated with the curing agent were more flourishing than that of the test slope without the curing agent. The reason is that rainwater and fertilizer water on the slope with the curing agent can penetrate into the curing agent through the external soil layer. Due to the water impermeability of the curing agent layer, the water preserving capability of the external soil, and the water absorption of polymer, the rainwater and the fertilizer water were stored in the polymer water-absorbing materials of the external soil and the pores of the surface of the curing agent layer, which was required for the growth of plants. Water and nutrients could be directly absorbed when plants need them. Therefore, the plants grew faster. However, the weak rock slope without the curing agent layer could be directly infiltrated by the rainwater and the fertilizer water through the external  
Figure 14: Penetration of the plant root system into the curing agent layer.  
Figure 13: Curing effect: (**a**) Closed void; (**b**) loose particles of bonded surface.  
soil layer. Water and nutrients were still in a dispersed state when plants needed them. Therefore, plants grew slowly.  
The ecological protection of the weak rock slope is a new kind of protection technology. Combined with the projects in Zhejiang and Hunan, the relevant practical techniques summarized by the project team are as follows.  
(1) Construction process  
(a) In the rainy season, construction was carried out using the following process: Cleaning the slope \(\rightarrow\) curing of the weak rock slope (spraying the curing agent) \(\rightarrow\) construction of the slope anchor \(\rightarrow\) hanging and fixing the wire mesh \(\rightarrow\) spraying the curing agent again (complementing spraying, preventing omission, and spraying the curing agent layer damaged in construction) \(\rightarrow\) external-soil spray-seeding (adding controllable polymer water-absorbing materials) \(\rightarrow\) curing.  
Figure 15: Plant growth conditions of the Zhejiang test slope: (**a–b**) 1 month later; (**c–d**) 3 months later; (**e–f**) 1 year and 3 months later.  
(b) In the dry season, construction was carried out using the following process: Cleaning the slope \(\rightarrow\) construction of the slope anchor \(\rightarrow\) curing of the weak rock slope (spraying the curing agent) \(\rightarrow\) hanging and fixing the wire mesh \(\rightarrow\) spraying the curing agent again (complementing spraying, preventing omission, and spraying the curing agent layer damaged in construction) \(\rightarrow\) external-soil spray-seeding (adding controllable polymer water-absorbing materials) \(\rightarrow\) curing.  
(2) The traditional external-soil spraying machine was used as the spraying equipment of the polymer curing agent.  
(3) When the polymer-cement ratio of polymer curing agent was 1, an effective protective layer was formed on the slope surface and good adhesion and integration effects were achieved.