Analysis of Mechanical Properties and Slope Stability of Red Bed Soft Rock: A Case Study in Xinjiang Irrigation Diversion Channel

Table 4

Mechanical properties of common structural planes of red-bed soft rock.

Rock	Structural plane type	Cohesion (kPa)	Friction angle (°)
Mudstone	—	0.06–0.08	20–30
Siltstone	—	0.03–0.25	20–50
Sandstone	—	0.07–1.0	15–60
—	Pure mud type	2–5	10–14
—	Mud debris type	20–50	14–19
—	Debris mud type	50–100	19–22
—	Rock fragment type	100–250	22–29
—	Closed structural plane	50–150	22–35