Identification and Assessment of Subway Construction Risk: An Integration of AHP and Experts Grading Method

Table 15

Rock and soil construction classification and bearing capacity characteristic value table.

Name of rock and soil layer	Geotechnical construction engineering is classified	The characteristic value of bearing capacity (fak/fa) (kPa)
No. ① plain fill	II	—
No. ①1 miscellaneous fill	II	—
No. ② coarse sand	I	150
No. medium coarse sand with silt	I	60
No. ⑦ silty clay	II	180
No. ⑦1 silty clay with organic matter	II	120
No. ⑦2 coarse sand	I	220
No. ⑫ cohesive soil coarse gravel sand	II	300
No. ⑫1 layer silty clay	II	250
No. ⑯up superweathered subzone of strato, coarsely grained granite	IV	1000
No. ⑯down strong weathering lower subzone of coarse-grained granite	IV	1500
No. ⑯3 strongly weathered granite porphyry	IV	1000
No. ⑯5 sandy cataclastic rock	IV	600
No. ⑰ moderately weathered coarse-grained granite	V	2000
No. ⑰3 moderately weathered granite porphyry	V	2000
No. ⑰5 layered massive cataclasite	V	1800
No. ⑱ slightly weathered coarse-grained granite	VI	5000
No. ⑱3 slightly weathered granite porphyry	VI	5500