Failure mechanism and divisional differentiated control of surrounding rock in mining roadway under remaining coal pillar in close‐distance coal seam

Regarding the issue of intense mining pressure appearing in underlying gateway below remaining coal pillar close-distance seam (the is perpendicular to section pillar), 401 working face used as engineering background. Field measurements, laboratory experiments, numerical simulations, and verification techniques are study abutment pressure's evolution properties plastic zone's propagation laws before after roadway experienced impact. The conclusions follows: ① maximum area on two sides roof gob up 2 1.5 m, whereas 5 4.5 respectively. Moreover, extends along sides, completely broken when mined pillar. ② stress increase coefficient K overlap reaches 3.4 penetrates advance overlaid with concentrated ③ When 4, −2, −8, −14 m away from pillar, damage range 5–10 ahead increases turn. At same time, passes through upper floor. Therefore, transition areas both divided into Area I (15 m) → II most complicated control under 20 III (25 according width. Furthermore, divisional differentiated combined technology channel steel truss anchor cable joint double-way locking function Areas III, while side + high resistance integral door-type support proposed II. practice shows that deformation surrounding rock can be controlled within 210 mm adopting above technology. Finally, operation safely efficiently pass research results have important reference values for roadways overlapping similar “+”-type cross-working face.