TITLE:
Zonal Disintegration Effect of Deep Straight Wall Semicircular Arch with Different Roadway Heights
AUTHORS:
Jiao Zhang, Huifang Li
KEYWORDS:
Zonal Disintegration, Straight Wall Semicircular Arch, Roadway Height, Plastic Zone, Abutment Pressure
JOURNAL NAME:
Open Access Library Journal,
Vol.7 No.10,
October
30,
2020
ABSTRACT:
In order to study the zonal disintegration effect of deep straight wall semicircular arch roadway with different roadway heights, FLAC3D numerical simulation software was used to systematically study the characteristics of plastic zone, surrounding rock deformation and surrounding rock abutment pressure distribution. The results show that: the rupture zone at the floor of straight wall semicircular arch roadway develops layer by layer in the form of “” and the displacement isoline at the roof is “eggshell shape”. No matter what the value of roadway height is, a rectangular fracture zone will be formed; the surrounding rock deformation in Z direction of straight wall semicircular arch roadway exists in the form of “inverted triangle” at the floor, and the height of “inverted triangle” is constant no matter what the height of roadway is, that is, the area is certain; after the excavation of the roadway, the stress concentration phenomenon occurs on the left and right sides of the straight wall semicircular arch roadway; the phenomenon mostly occurs on both sides of the arch.