Large and super-large section chamber groups in coal mines are frequently affected by dynamic loads resulting from production activities such as roadway driving and blasting.The stability of the surrounding rock is po...Large and super-large section chamber groups in coal mines are frequently affected by dynamic loads resulting from production activities such as roadway driving and blasting.The stability of the surrounding rock is poor,and it is difficult to control.In this paper,a similar simulation test was used to study the deformation and evolution laws of the surrounding rock of a triangle-shaped chamber group under different dynamic loads.The results showed that under dynamic loading,the vertical stress of the surrounding rock of the chamber group increased in an oscillatory form.The maximum stress concentration coefficient reached 4.09.The damage degree of the roof was greater than that of the two sides.The deformation of the roof was approximately 1.2 times that of the two sides.For the chamber closer to the power source,the stress oscillation amplitude of the surrounding rock was larger,and the failure was more serious.The force of the anchorage structure showed a phased increasing characteristic;additionally,the force of the anchorage structure on the adjacent side of the chambers was greater than that on the other side.This study reveals the deformation and failure evolution laws of the surrounding rock of large section chamber groups under dynamic loading.展开更多
阴阳毒是《伤寒杂病论》中唯一以“毒”命名的疾病,为毒邪蓄结阴阳二经所致,病变部位广泛,毒发势重,有传染性,可分为阴毒和阳毒。A组链球菌(group a streptococcus, GAS)引起的感染起病急骤,其临床症状、病程与阴阳毒证候群吻合。阳毒...阴阳毒是《伤寒杂病论》中唯一以“毒”命名的疾病,为毒邪蓄结阴阳二经所致,病变部位广泛,毒发势重,有传染性,可分为阴毒和阳毒。A组链球菌(group a streptococcus, GAS)引起的感染起病急骤,其临床症状、病程与阴阳毒证候群吻合。阳毒对应猩红热,猩红热特征为全身泛发的大量细小网状皮疹,咽喉红肿糜烂,与阳毒咽喉痛、唾脓血且发斑吻合。阴毒对应链球菌中毒性休克综合征,其临床表现腹膜炎、心内膜炎,对应阴毒的“腹中绞痛,毒气攻心,心下坚强,短气不得息”等症,后期因休克及弥散性血管内凝血使体温偏低,对应“呕逆,唇青面黑,四肢厥冷”。治疗需以解毒为主,升麻鳖甲汤解毒、活血散瘀、阴阳并济,不同于伤寒所用之汗法、下法、清法与温法,为后世治疗热入血分证提供了参考。展开更多
基金financial support from the National Key R&D Program of China(No.2018YFC0604703)National Natural Science Foundation of China(Nos.51804181,51874190,and 52074168)Key R&D Program of Shandong Province(No.2019GSF111020)。
文摘Large and super-large section chamber groups in coal mines are frequently affected by dynamic loads resulting from production activities such as roadway driving and blasting.The stability of the surrounding rock is poor,and it is difficult to control.In this paper,a similar simulation test was used to study the deformation and evolution laws of the surrounding rock of a triangle-shaped chamber group under different dynamic loads.The results showed that under dynamic loading,the vertical stress of the surrounding rock of the chamber group increased in an oscillatory form.The maximum stress concentration coefficient reached 4.09.The damage degree of the roof was greater than that of the two sides.The deformation of the roof was approximately 1.2 times that of the two sides.For the chamber closer to the power source,the stress oscillation amplitude of the surrounding rock was larger,and the failure was more serious.The force of the anchorage structure showed a phased increasing characteristic;additionally,the force of the anchorage structure on the adjacent side of the chambers was greater than that on the other side.This study reveals the deformation and failure evolution laws of the surrounding rock of large section chamber groups under dynamic loading.
文摘阴阳毒是《伤寒杂病论》中唯一以“毒”命名的疾病,为毒邪蓄结阴阳二经所致,病变部位广泛,毒发势重,有传染性,可分为阴毒和阳毒。A组链球菌(group a streptococcus, GAS)引起的感染起病急骤,其临床症状、病程与阴阳毒证候群吻合。阳毒对应猩红热,猩红热特征为全身泛发的大量细小网状皮疹,咽喉红肿糜烂,与阳毒咽喉痛、唾脓血且发斑吻合。阴毒对应链球菌中毒性休克综合征,其临床表现腹膜炎、心内膜炎,对应阴毒的“腹中绞痛,毒气攻心,心下坚强,短气不得息”等症,后期因休克及弥散性血管内凝血使体温偏低,对应“呕逆,唇青面黑,四肢厥冷”。治疗需以解毒为主,升麻鳖甲汤解毒、活血散瘀、阴阳并济,不同于伤寒所用之汗法、下法、清法与温法,为后世治疗热入血分证提供了参考。
