地表移动实验平台研制与矿区房屋实验研究

Development of surface movement experimental platform and experimental study of buildings in mining area

  • 摘要: 煤矿区村庄房屋采动影响状况关系到当地民生和社会稳定,需要深入研究地表移动变形对房屋损坏的影响规律和保护措施,但目前国内外尚缺乏矿区村庄房屋损坏定量实验研究的有效物理模拟手段。为此,提出了基于支撑柱时序加载与三向移动定量计算的地表移动实验平台设计思路,研制了多点支撑和三向加载控制的地表移动实验平台(SPSM),构建了房屋模型“砖块(点)−砌体墙(面)−房屋(体)”多尺度的几何和力学相似理论,研究了村庄房屋模型制作工艺,并以峰峰矿区A村房屋为例进行模拟实验,制作了有底梁大跨度房屋、无底梁大跨度房屋和小跨度自然间房屋模型,定量分析了不同移动变形作用下3种类型房屋的损坏特征。实验结果表明:石膏粉与水7∶1混合为骨料、酒精胶为黏结剂,可作为房屋最优模拟材料与参数配比;在同等量级地表变形加载条件下,小跨度和有底梁房屋抗变形能力较强,组合变形作用的房屋损坏程度大于单一变形;受水平拉伸变形影响,墙面出现正八字形斜向裂缝,屋顶与墙体连接处水平开裂;地表正曲率变形时,房屋墙面顶部、屋顶和窗角出现裂缝,房顶和门角裂缝易连通;揭示了屋顶裂缝宽度与地表正曲率变形呈线性正相关关系,门窗墙裂缝宽度与地表拉伸变形呈“S”型正相关关系。通过与现场实测对比,房屋裂缝发育形态和位置与模型实验结果基本吻合,验证了模拟实验平台的可靠性。自动控制的地表移动机械化模拟实验平台的研制、房屋模型制作和变形损坏实验研究成果,可为矿区建(构)筑物采动影响物理模拟和评价提供新的手段,为房屋损坏机理研究与加固维护提供参考。

     

    Abstract: The mining influence of village buildings in the coal mining area is related to the local people’s livelihood and social stability. It is necessary to study the influence law and protection measures of surface movement and deformation on building damage and protective measures. However, there is still a lack of effective physical simulation methods for quantitative experimental research on house damage in mining villages. Therefore, this paper proposes a design concept for the surface movement experimental platform based on the time-sequential loading of supporting columns and the quantitative calculation of three-dimensional movement, develops the surface movement experimental platform with multi-point support and three-dimensional loading control. The multi-scale geometric and mechanical similarity theory of “brick (point)- masonry wall (surface)- building (body)” for the house model is established, and the production process of village building model based on similarity theory is studied. Taking the A village building in Fengfeng mining area as an example, the simulation experiment is carried out. The models of large-span building with bottom beams, large-span building without bottom beams and small-span natural building are made, and the damage characteristics of three types of buildings under different movement and deformation are quantitatively analyzed. The experimental results show that the gypsum powder and water at 7∶1 mixed as aggregate, alcohol adhesive as binder, can be used as the optimal simulation material and parameter ratio of the building; under the same magnitude of surface deformation loading conditions, small-span and bottom beam building has good ability to resist surface deformation. the damage degree of the building under the combined deformation is greater than that of the single deformation. Affected by the horizontal tensile deformation, the wall surface has an eight-shaped oblique crack, and the horizontal crack at the connection between the roof and the wall; when the positive curvature of the ground surface is deformed, cracks appear on the top of the wall, roof and window corners of the building, and the cracks on the roof and door corners are easy to connect. It is revealed that there is a linear positive correlation between the crack width of the roof and the positive curvature deformation of the surface, and there is an “S” type positive correlation between the crack width of the door and window wall and the tensile deformation of the surface. By comparing with the field measurement, the shape and location of the cracks in the building are basically consistent with the model experiment results, which verifies the reliability of the simulation experiment platform. The development of the automatic control surface movement mechanization simulation experiment platform, the production of the building model and the experimental research results of deformation damage can provide a new research method for physical simulation and damage evaluation of buildings (structures) in mining area, and provide a reference for the study of the building damage mechanism and the reinforcement and maintenance.

     

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