Safety assessing method after strip mine caving process processing of complicated cavity von ZHENG CANHUI, MAI JIUDIAN, ZHANG YANHONG, YAN WEIFENG, XIE JIUJING, ZHANG DIANHE, JIA BAOSHAN, XU SENMIN, ZHANG CHENGTAO, ZHANG JINZHU, WANG LUOFENG, DU HONGBO, LI LIANG

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