Analysis of Bearing Structures around Deep Soft Rock Roadway

作者：Li, Shuqing^*; Sun, Xuefeng; Ye, Zhouyuan; Tan, Yulin

来源：Disaster Advances, 2013, 6: 250-255.

• Deep mining
• soft rock roadway
• inner bearing structure
• outer bearing structure
• numerical simulation

There is a large range of broken rock zone in surrounding rock mass around deep soft rock roadways. With the strain-softening constitutive model in FLAC, characteristics of surrounding rock around deep roadways such as stress distribution, deformation, and strength were analyzed through numerical simulations. Results showed that the stress concentration region of surrounding rock around deep roadways are farther from the periphery and larger size, and has slightly less maximum of concentration coefficients than that around shallow roadway; the stress concentration region consists of the elastic zone, the plastic hardening zone and a part of the plastic softening zone in surrounding rock around deep roadway; there is a phenomenon that the strongly and the weakly strength-softening zones alternate in the surrounding rock near by the periphery around deep roadway. The inner-outer bearing structure mechanical model was brought forward for deep soft rock roadway. Definitions of the inner bearing structure and the outer bearing structure were given. Their features were interpreted. Their functions in the process of surrounding rock stabilization in deep roadway were illuminated. An approach for determining the boundary location of the outer bearing structure based on deep base point displacements was indicated.

• 出版日期2013-12
• 单位湖南科技大学