承德避暑山庄永佑寺后序碑热应力分布特征模拟及易损性评价

Characteristics of thermal stress and vulnerability assessment of Houxu Tablet in Yongyou Temple Mountain Resort

温度变化是引起岩石物理风化的主要因素之一。文中针对承德永佑寺后序碑在夏季太阳辐射条件下的瞬态热应力响应进行了分析。数值分析结果表明,石碑内部温度剖面特征显示赑屃顶部和赑屃内部温度分布存在集中区,而石碑中部温度分布较为均匀,太阳辐射面积以及和地面的热传导是温度分布特征的外部影响因素;高温条件下石碑内部产生了明显的热应力,特别是在赑屃底部首尾表面以及赑屃背部,其应力大小已超过岩石抗拉强度,极易造成岩体的破坏。

Temperature change is the most important factor that causes the physical weathering of rocks.In this paper,the transient thermal stress response analysis under the conditions of summer solar radiation is carried out on the Houxu Tablet of Chengde Yongyou Temple.The results show that the temperature profile characteristics of the interior of the tablet stone show that the temperature distribution of the top and base is more complex,while the temperature distribution in the middle of the stone is more uniform.Solar radiation area and thermal ion flow to the ground are the factors that influence the characteristics of temperature distribution.High temperatures create significant stresses inside the stone,especially on the surfaces of the bottom Bixi and on the back of Bixi,the value of which can already cause damage to the rock.