This project is a metro project and a large public building facility. According to the investigation, the mountain slope near the parking lot collapsed in many places, among which the starting point of the access line is in a state of soil collapse, the northeast corner of the quarry is in a state of rock collapse and partial rock collapse along the joint slope. Therefore, it can be seen that the natural slope near the parking lot is in an unstable state.

The high slope of the parking lot is located in the north of the main section of nansha parking lot and the original quarry pit. A steep slope of about 80 degrees is formed due to quarrying. Part of the slope is vertical, forming a high and steep hollow surface. The slope is about 65~100m high, which is in the shape of a steep ridge without any support. The upper part of the slope is composed of granite residual soil and highly weathered soil. The structure is loose and has the property of softening, collapse and strength decreasing rapidly when it meets water. The lower part of the slope is composed of migmatized granite with multiple fractures. In addition, due to the local closed crack opening caused by mining blasting, unloading crack is formed, which is in an unfavorable combination with the slope surface and affects the stability of the slope. Therefore, the current situation of the slope is poor in stability. There are schools and residential areas at the foot of the mountain about 230m from the vertical distance to the top, and the buildings are relatively dense. Therefore, the slope on the north side of the mountain needs to be reinforced and protected. 

The state of slope surface at the initial stage of construction

The state of slope surface after construction

Slope surface vegetation restoration after treatment

Restoration effect of slope surface vegetation after treatment