陕北地区传统民居靠崖式砖窑承载力及稳定性评估

Evaluation of bearing capacity and stability of caves on the cliff of traditional dwellings in northern Shaanxi

为研究陕北地区传统民居靠崖式砖窑的承载能力及稳定性,通过现场检测和调查靠崖式砖窑的残损情况及坍塌区域对整体结构的影响,采用有限元软件ABAQUS对窑洞单体和窑洞-边坡整体进行了承载力和稳定性分析。研究结果表明:靠崖式砖窑较严重残损主要分布在窑腿、拱顶,病害主要表现为窑腿开裂和外闪,拱券开裂、局部松动乃至坍塌;坍塌区域的地基由于应力释放引起上部窑洞部分区域倾斜、开裂;窑洞单体在外荷载作用下变形及应力较小,受地震作用影响较小;窑洞-边坡模型失稳时的强度折减系数为1.15,表明该边坡目前处于稳定状态,在降水较多时存在失稳的风险。

In order to study the bearing capacity and stability of cave on the cliff of traditional dwellings in northern Shaanxi Province,through on-site detection and investigation of the damage of cave on the cliff and the impact of collapse area on the overall structure,finite element software ABAQUS was used to analyze the bearing capacity and stability of single cave cave and the whole cave-slope.The research results show that:The serious damage of cave on the cliff is mainly distributed in the cave leg and arch roof.The main diseases are cave leg cracking and external flash,arch cracking,local loosening and even collapse.The foundation in the collapse area is inclined and cracked due to the stress release.The cave-dwelling monomer is less deformed and stressed under external load and less affected by earthquake.When the cave-slope model is unstable,the strength reduction coefficient is 1.15.On the surface,the slope is currently in a stable state,and there is a risk of instability in a large amount of precipitation.