地震作用下煤矿采动建筑物的能量耗散演化分析研究

发布时间：2018-08-22 20:20

【摘要】：为了深入探讨煤矿开采区建筑物在开采沉陷和地震的联合作用下的损伤演化过程,基于耗散结构理论,从能量角度对煤矿采动建筑物的动力破坏过程进行了系统的定量分析。依据耗散结构理论在土木工程抗震减震领域的研究成果,探讨分析了地震作用下煤矿采动建筑物的耗散结构的形成过程,结合矿山开采沉陷学、结构力学、结构动力学等相关理论,推导出地震作用下煤矿采动建筑物的能量演化方程,通过设定不同程度的开采沉陷荷载工况,探讨不同程度开采沉陷作用下建筑物中能量的演化过程,根据《建筑抗震设计规范》(GB50011-2010)选取KOBE地震波、TAFT地震波、人工模拟地震波分别进行开采沉陷和地震联合作用下建筑物有限元数值计算,量化分析了地震作用下煤矿采动建筑物的能量耗散的演化过程。计算结果表明：(1)在开采沉陷作用下,建筑物系统输入大量能量,主要以弹性存储能量的形式存储在建筑物系统中,但当开采沉陷作用增大到一定程度,输入能量超过某一阀值时(建筑物进入塑性变形及损伤阶段),建筑物系统中产生塑性耗散能量和损伤耗散能量,与外界交换能量来维持建筑物系统的平衡。(2)在开采沉陷作用影响下,地震发生时输入建筑物的能量有所增加,说明煤矿采空区严重加剧了地震灾害荷载的破坏性；在开采沉陷作用影响下,地震发生时建筑物产生的塑性耗散能量和损伤耗散能量增加,建筑物产生更多的塑性变形和损伤,增大了建筑物倒塌的概率,结构阻尼耗能减少,不利于建筑物通过阻尼耗能减小地震对建筑物的破坏作用。为了保证建筑物的安全,应减少系统中对建筑物不利的塑性耗散能量和损伤耗散能量,增加对建筑物有利的阻尼耗能,因此应对煤矿采动建筑物建立合适的抗开采沉陷变形隔震保护新体系。
[Abstract]:In order to probe into the damage evolution process of buildings in coal mining area under the combined action of mining subsidence and earthquake, based on dissipative structure theory, the dynamic damage process of coal mining buildings is analyzed quantitatively systematically from the angle of energy. Based on the research results of dissipative structure theory in the field of earthquake resistance and seismic absorption of civil engineering, the formation process of dissipative structure of coal mining buildings under earthquake action is discussed and analyzed. Based on the theory of structural dynamics, the energy evolution equation of coal mining buildings under earthquake action is derived. By setting different mining subsidence load conditions, the evolution process of building energy under different mining subsidence is discussed. According to the Code for Seismic Design of buildings (GB50011-2010), the KOBE seismic wave and tact seismic wave are selected, and the artificial simulated seismic waves are used to calculate the finite element of the building under the combined action of mining subsidence and earthquake respectively. The evolution process of energy dissipation of coal mining buildings under earthquake action is analyzed quantitatively. The results show that: (1) under the action of mining subsidence, a large amount of energy is input into the building system, which is mainly stored in the form of elastic storage energy, but when the mining subsidence effect increases to a certain extent, When the input energy exceeds a certain threshold (the building enters the plastic deformation and damage stage), the plastic dissipation energy and the damage dissipation energy are generated in the building system. Exchanging energy with the outside world to maintain the balance of building system. (2) under the influence of mining subsidence, the energy input into the building increases when the earthquake occurs, which indicates that the mine goaf seriously intensifies the damage of earthquake disaster load; Under the influence of mining subsidence, the plastic dissipation energy and damage dissipation energy produced by buildings increase, and the building produces more plastic deformation and damage, which increases the probability of building collapse and reduces the energy dissipation of structure damping. It is unfavorable for buildings to reduce the damage of buildings by damping and energy dissipation. In order to ensure the safety of the building, the plastic dissipation energy and the damage dissipation energy should be reduced, and the beneficial damping energy consumption should be increased. Therefore, a new system of seismic isolation protection against mining subsidence deformation should be established.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311.3

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