经PS材料加固后遗址土体热传导性能的试验研究  

EXPERIMENTAL STUDY OF THE HEAT-CONDUCTION PROPERTIES OF EARTHEN RUINS SOIL REINFORCED BY POTASSIUM SILICATE MATERIALS

作　　者：张得煊[1] 王同瑞[1] 王旭东[2] 郭青林[2] 

机构地区：[1]上海交通大学土木工程系,上海200240 [2]敦煌研究院保护研究所,甘肃敦煌736200

出　　处：《岩石力学与工程学报》2011年第1期202-207,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40772187);上海市重点学科建设项目(B208)

摘　　要：PS材料对西北干旱区土遗址具有良好的加固效果,能够大大提高遗址土体的力学强度和抗风蚀能力。为了探讨PS材料对土遗址土体热传导性能的影响作用,研制可测定土遗址土体热传导率的装置,使用新疆交河故城遗址现场的扰动土制做成土样,进行PS材料加固土样的热传导率测定试验及室内模型试验。结果表明,经PS材料加固后的土遗址土体具有热传导率减小的趋势,并且PS材料浓度越大,加固土体的热传导率越小。室内模型试验发现,当外界温度变化时,PS材料加固土体对温度变化的反应比未加固土体缓慢。这表明经PS材料加固后的土体,由于热传导率的降低,阻碍土体的热传导过程,具有能减缓温差所引起的物理风化作用,对研究西北干旱区土遗址的加固保护具有重要的意义。As a new type of inorganic reinforced material,potassium silicate（PS） can greatly improve the mechanical strength and the ability of anti-wind erosion of earthen ruins soil after being reinforced.Therefore,a test device for determining the thermal conductivity of ruins soil was developed.Then,soil specimens were made from the disturbed soil collected from site of Jiaohe Ruins;and then,in order to study the influence of PS on the heat transfer process of the soil,the determination test of the thermal conductivity and the laboratory model test were carried out.Test results show that the thermal conductivity of PS reinforced soil is reduced;furthermore,the larger the concentration of PS is,the smaller the thermal conductivity of soil is.In addition,it is found from the laboratory model test that when external temperature changed,the PS reinforced soil responded slower to the temperature change compared with that of the untreated soil;so,it is inferred that due to PS reduced the thermal conductivity of reinforced soil,and the heat transfer process of the soil is hindered.The finding above shows that PS reinforced soil can slow down the physical weathering caused by temperature difference;and this will have an important significance on studying the conservation of earthen ruins in Northwest China arid areas.

关 键 词：土力学 PS材料 土遗址保护 热传导率 温度测定 室内模型试验 

分 类 号：TU41[建筑科学—岩土工程]