预制单裂缝花岗岩化学侵蚀作用的试验研究  

Experimental Study on Mechanical Properties of Single Fractured Granite Under Chemical Erosion

作　　者：司马军[1,2] 谭睿 马旭 潘健 蒋明镜 SIMA Jun;TAN Rui;MA Xu;PAN Jian;JIANG Mingjing(School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072 China;Hubei Provincial Key Laboratory of Geotechnical and Structural Safety,Wuhan,Hubei 430072,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]湖北省岩土与结构安全重点实验室,湖北武汉430072 [3]同济大学地下建筑与工程系,上海200092

出　　处：《水利与建筑工程学报》2018年第4期73-78,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家重点基础研究发展计划资助项目(2014CB046901)

摘　　要：为了研究化学侵蚀对裂隙岩体的影响,将天然花岗岩加工成板状样,用水刀预制单裂缝,然后将其浸泡在化学溶液中并施加竖向荷载,经过预定时间后进行单轴压缩试验。通过比较浸泡前、后试样质量和力学性质的变化,研究了溶液浓度、pH值、应力水平和浸泡时间等因素的影响。研究结果表明:封闭溶液条件下,试样的质量损失微小但力学性质劣化明显;经化学溶液浸泡后,试样压缩变形有从脆性向延性转变的趋势;酸性环境下的起裂应力、峰值强度和弹性模量最低,碱性环境次之,中性环境最大;随着浓度、应力水平及浸泡时间增加,起裂应力变化波动性较大,而峰值强度和弹性模量均单调减小。In order to study the mechanical properties of rocks under chemical erosion,several plate specimens of granite with single-fracture were prefabricated using water jet scalpel.Then,they were immersed in several kinds of chemical solution coupled with vertical load.After that,uniaxial compressive tests were conducted on these samples in due time.The quality and mechanical properties of immersed samples were compared with those of non-immersed ones.The influence of solution concentration,pH value,stress level and immersion time was analyzed respectively.It shows that the change of quality is tiny while the mechanical degradation is significant in closed condition.The compressive characteristic of immersed samples tends to change from brittleness to ductility.The value of mechanical properties,such as crack initiation stress,peak strength and elastic modulus,are the lowest in acid solution,followed by alkaline solution and neutral solution orderly.With the increase of solution concentration,stress level and immersion time,the crack initial stress fluctuates obviously,while the peak strength and the elastic modulus drop monotonously.The results are beneficial to revealing the mechanical properties of chemical weathering rocks.

关 键 词：花岗岩 单裂缝 化学侵蚀 应力水平 单轴压缩试验 

分 类 号：TU458[建筑科学—岩土工程]