摘要
基于拉拔和推出试验开展了不同龄期礁灰岩锚固体的界面黏结强度研究,结合动态冲击试验,分析了动力扰动下礁灰岩锚固体系中锚杆-砂浆(B-M)界面、礁灰岩-砂浆(R-M)界面强度的演变规律。结果表明,B-M和R-M组合体在动态冲击荷载作用下,随着冲击气压的增大,界面强度劣化效应发展速率逐渐增加,且随着养护龄期从1d增加至7d, B-M和R-M组合体界面强度受冲击气压的影响显著减小;与此同时,分别建立了B-M和R-M组合体的界面强度损耗率与冲击气压和养护龄期之间的关系式,发现动态冲击荷载对界面强度劣化起主导作用,在养护后期,B-M界面抵抗冲击荷载的能力强于R-M界面;静力拉拔作用下,礁灰岩锚固体系的破坏更易发生于R-M界面。
Based on the pull-out test and push-out test,the interfacial bond strength of reef limestone anchorage body at different ages was studied.Combined with dynamic impact test,the evolution law of bolt-mortar(B-M)interface and reef limestone-mortar(R-M)interface strength in reef limestone anchorage system under dynamic disturbance was analyzed.The results show that,under dynamic impact loading,with the increase of impact pressure,the deterioration rate of interface strength of B-M and R-M composite increases gradually,and with the increase of curing time from 1 d to 7 d,the influence of impact pressure on interface strength of B-M and R-M composite decreases significantly.At the same time,the relationship between the interface strength loss rate of B-M and R-M combination and the impact pressure and curing age is established respectively.It is found that the dynamic impact load plays a leading role in the deterioration of interface strength.In the later stage of curing,the ability of B-M interface to resist impact load is stronger than that of R-M interface.Under static pull-out,the failure of reef limestone anchorage system is more likely to occur at the R-M interface.The research results can provide effective theoretical support for reef limestone engineering construction and dynamic support design.
作者
罗忆
刘鑫
李陈
龚航里
裴晨浩
邓运辰
LUO Yi;LIU Xin;LI Chen;GONG Hang-li;PEI Chen-hao;DENG Yun-chen(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572024,China)
出处
《武汉理工大学学报》
CAS
2023年第3期124-130,145,共8页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51979208)
湖北省自然科学基金杰出青年人才项目(2020CFA102)
海南省自然科学基金创新研究团队项目(521CXTD444)。
关键词
礁灰岩锚固体
动力扰动
养护龄期
界面强度劣化
limestoneanchorage
dynamicdisturbance
curingage
interfacestrengthdegradation
