doi:10.16186/j.cnki.1673-9787.2020110068

Received:2020/11/23

Revised:2021/01/21

Published:2022/07/15

Deformation and failure laws of deep roadway excavation near a fault

CUI Wei1, CUI Feng2, PAN Xiahui3, ZHANG Boyang3

1.Hanjiawan Coal Co. ， Ltd. ， Shaanxi Shaanmei Nrothern Shaanxi Coal Mining Industry Limited Company，Yulin  719100 ， Shaanxi， China;2.Weiqiang Coal Industry Company， Shaanxi Yanchang Petroleum Mining Limited Company，Yulin  719100，Shaanxi，China;3.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract: When the excavation of deep roadway encountersa fault,the deformation and failure characteristics of surrounding rock change greatly, which seriously affects the safety production. Therefore , taking a deeply buried wind tunnel in Haishiwan coal mine as an example,the variation and development characteristics of surrounding rock stress , deformation , plastic zone and shear strain during excavation were studied. The influences of fault dip angle,fracture zone width and lateral pressure coefficient on the stability of roadway surrounding rock were analyzed. The results showed that:When the net distance between the deep buried roadway and the fault was less than 5 m,the shear strain of the rock mass in the plastic zone around the roadway would gradually increase as the roadway approached the fault,leading to an exponential increase in the surrounding rock mass displacement;With the increase of the lateral pressure coefficient, the failure depth of the surrounding rock plastic zone of roof and floor gradually increased, while the upper part first decreased and then increased;When the net distance between the fault and the roadway was greater than 5 m，the fault dip angle and width had little influence on the convergent displacement and plastic zone distribution of the surrounding rock of the roadway. On the contrary，the convergent displacement of the roadway reached its maximum at the fault dip angle of 90°，and its relation with the width of the fracture zone was exponential attenuation.

Key words:deep roadway;fault;stress;displacement;plastic zone;shear strain;fault dip angle;fault zone width;lateral pressure coefficient

近断层深埋巷道掘进变形破坏规律_崔魏.pdf