【摘要】 基于原岩应力场与采动应力场,提出支护应力场的概念,即支护在围岩中产生的应力场与在支护体内部产生的应力场,并指出3种应力场构成了煤矿井下综合应力场.在井下实测数据的基础上,研究了煤矿井下原岩应力,特别是构造应力的分布特征;采用数值模拟方法,分析了掘进工作面、巷道及采煤工作面周围应力分布特征与规律,采动集中应力的大小;计算了预应力锚杆支护、单体液压支柱及金属支架在围岩中产生的应力场.分析计算了锚杆杆体、托板及钢带等支护构件中的应力大小与分布特征,并对比分析了原岩应力、采动应力及支护应力的量值.论述了原岩应力场对采动应力场的影响,以及采动应力场与支护应力场的相互作用与关系.更多还原

【Abstract】 The concept of supporting stress fields was put forward on the basis of in-situ and mining stress fields,which are the stress fields in surrounding rock caused by supports and the stress fields in the supports.The three types of stress fields consist of comprehensive stress field in underground coal mines.Based on the underground measurement data,the distribution characteristics of in-situ stresses,especially tectonic stresses were analyzed;the stress distribution features and laws,the magnitude of stress concentration around heading face and working face were analyzed by means of numerical simulation;the stress fields in surrounding rock caused by pretensioned bolting,individual hydraulic props and steel arches were computed.The stress magnitude and distribution features in bolt bar,plate and steel strap were computed in contrast to the magnitudes of in-situ stresses,mining stresses and supporting stresses.The affects of in-situ stresses to mining stresses,and the interaction and relation between mining and supporting stress fields were discussed.更多还原