ZHANG B Y, ZHANG Y K, HUANG H W,et al.Study on height and development form of roof water flowing fractured zone based on similar simulation test[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):29-38.

doi:10.16186/j.cnki.1673-9787.2023030003

Received:2023/03/02

Revised:2023/05/30

Published:2024/07/05

Study on height and development form of roof water flowing fractured zone based on similar simulation test

ZHANG Boyang, ZHANG Yuke, HUANG Huwei, LIN Zhibin, LI Yachao

School of Civil Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract: Objectives In order to study the height and development form of roof water-conducting fracture zone under the influence of mining，  Methods a similar simulation test was carried out on the 1303 working face in the third mining area of Sima Coal Mine.Based on this，by changing the lithological combination of roof，the development height and shape of roof fracture zone in different lithological combinations were analyzed and verified theoretically by digital photogrammetry system. Results The application results showed that：（1）When the advancing length of the working face was 160 m，the maximum development height of the leading fracture zone of the hard rock lithologic roof model，the hard-soft rock lithologic combination roof model and the soft rock lithologic roof model were 69.6 m，55.6 m and 61.1 m respectively.（2）The development patterns of the three models were the normal trapezoid with a bottom angle of 50°，the approximate normal trapezoid with a front bottom angle of 62° and a rear bottom angle of 60°，and the trapezoid with a front bottom angle of 50° and a rear bottom angle of 60°.（3）Based on the results of model test and statistical data，a prediction expression for the development height of water-channeling fracture zone in the south of Ergangshan fault-fold belt in Changzhi was given.（4）Using the method of material mechanics，the formation law of collapse angle was analyzed.The results showed that the relationship between the collapse angle and the development height of the pilot fracture zone was an arctangent function.The development angles of the front and bottom corners of the three models were calculated to be 49.24°，61.21°，and 51.12°，respectively.The development heights of the guided fracture zones in the three models were 74.1 m，51.1 m，and 59 m respectively，which were consistent with the results of similar simulation tests.  Conclusions The research results had certain reference significance for the prediction of the development height of water flowing fractured zone in various roof lithology coal mines.

Key words:water conducting fracture zone;developmental height;developmental morphology;similar test;lithologic combination of roof