硫酸盐对麦积山砂砾岩风化影响的试验研究  

Experimental study on the effect of sulfate on glutenite weathering in Maijishan grottoes

作　　者：王逢睿[1,2] 焦大丁 刘平 孙博[1,2] 王家杰[1] 杨鸿锐 WANG Feng-rui;JIAO Da-ding;LIU Ping;SUN Bo;WANG Jia-jie;YANG Hong-rui(College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou,Gansu 730000,China;Northwest Research Institute Co.,Ltd.,of CREC,Lanzhou,Gansu 730000,China;Key Laboratory of Mechanics on Disaster and Environment in Western China,Lanzhou University,Ministry of Education,Lanzhou,Gansu 730000,China)

机构地区：[1]兰州大学土木工程与力学学院,甘肃兰州730000 [2]中铁西北科学研究院有限公司,甘肃兰州730000 [3]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000

出　　处：《岩土力学》2020年第7期2199-2206,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51408285);中央高校基本科研业务费专项资金(No.lzujbky-2016-k15);中铁西北科学研究院有限公司科学技术项目。

摘　　要：麦积山石窟砂砾岩在盐分参与下出现粉化、剥落等现象,这大大加速了石窟岩体的风化进程。通过对砂砾岩进行毛细迁移及循环劣化试验,研究了硫酸盐在砂砾岩中的运移规律,分析了盐分参与下砂砾岩的破坏特征,并得出了其产生的结晶压力。结果表明:硫酸钠结晶使砂砾岩发生显著破坏;硫酸盐在砂砾岩中的运移呈现一定的规律性;硫酸钠溶液的浓度达到0.95~1.13 mol/L区间时,砂砾岩开始破坏,并且得出试验条件下结晶压力理论最大值可以达到33 MPa。The phenomenon of silting and spalling is very common during glutenite weathering in Maijishan grottoes.Previous studies have shown that the participation of salt greatly accelerates the weathering process of rock.In this paper,several sets of cylindrical specimens made of glutenite were used in two tests,namely capillary migration test and cycle degradation test.The migration patterns of sulfate in samples and the failure characteristics of the glutenite specimens were discussed.Based on the experimental data and theoretical analysis,the crystallization pressure in glutenite samples was calculated.This is an important parameter for judging the damage of glutenite caused by salt crystallization.The results show that:the crystallization of sodium sulfate caused substantial damage to glutenite;the migration of sulfate in glutenite had regularity;when the concentration of sodium sulfate solution was between 0.95 mol/L and 1.13 mol/L,the destruction of the conglomerate began.The theoretical maximum crystallization pressure could reach 33 MPa under the experimental conditions.

关 键 词：麦积山石窟 砂砾岩风化 结晶压力 硫酸钠溶液 

分 类 号：TU452[建筑科学—岩土工程]