Part of the chambers of the coalmine roadway in Western Inner Mongolia and Eastern Ningxia of China are in
weakly consolidated soft rock formation. Taking the horse head engineering in Maiduoshan coal mine in the main level as
an example, a new scheme was put forward to optimize the original supporting scheme. A three-dimensional numerical
model of the project of horse head was set up. According to the rock composition, different layer has different material
properties. Initial stress of the model was given according to the measure results of in-situ stress. Strain softening constitutive
model was used in calculation. The mechanical softening of surrounding rock after excavation was studied by numerical
analysis method. Numerical analysis was done before construction, and displacement of horse head surface was monitored
in construction. The result of numerical analysis and the monitoring data are similar. Good effect has been achieved
after the implementation of the project.
Numerical analysis, slope design and in situ stress