Stability Analysis and Parameter Optimization of Deep Excavation Supporting System in Granular Soils

Table 2

Physical and mechanical parameters of surrounding soils.

Types of soils	The thickness of the soil layer (m)	Natural density (kN·m^−3)	Cohesion (kPa)	Internal friction angle (°)
Miscellaneous soil	3.85	18.5	10	5.0
Silty clay	2.25	18.5	12	6.5
Medium coarse sand	5.4	17.5	3	29.6
Gravel sand	5.8	20.3	2	33.0
Pebble	5.3	20.5	2	34.0