首页|Study on Shear Strength Characteristics of Basalt-Concrete Bonding Interface Based on in-situ Direct Shear Test

Study on Shear Strength Characteristics of Basalt-Concrete Bonding Interface Based on in-situ Direct Shear Test

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In rock engineering,the shear strength of the basalt-concrete bonding interface is a key factor affecting the shear performance of hydroelectric dam foundations,embedded rock piles and rock bolts.In this study,30 sets of in-situ direct shear tests were conducted on the basalt-concrete bond interface in the Baihetan dam area to investigate the shear strength characteristics of the basalt-concrete bonding interface.The bonding interface contains two states,i.e.,the bonding interface is not sheared,termed as se(symbolic meaning see Table 1);the bonding interface is sheared with rupture sur-face,termed as si.The effects of lithology,Joints structure,rock type grade and concrete compressive strength on the shear strength of the concrete-basalt contact surface were investigated.The test results show that the shear strength of the bonding interface(se&si)of columnar jointed basalt with concrete is greater than that of the bonding interface(se&si)of non-columnar jointed one with the same rock type grade.When the rock type grade is Ⅲ2,fcol is 1.22 times higher than fncol and ccol is 1.13 times great-er than cncol.The shear strength parameters of the basalt-concrete bonding interface differ significantly for different lithologies.The cohesion of the bonding interface(si)of cryptocrystalline basalt with con-crete is 2.05 times higher than that of the bonding interface(si)of breccia lava with concrete under the same rock type grade condition.Rock type grade has a large influence on the shear strength of the non-columnar jointed basalt-concrete bonding interface(se&si).cnol increases by 33%when the grade of rock type rises from Ⅲ1 to Ⅱ1.the rock type grade has a greater effect on bonding interface(si)cohe-sion than the coefficient of friction.When the rock type grade is reduced from Ⅲ2 to Ⅲ1,f'ncol increases by 2%and c'ncol improves by 44%.The shear strength of the non-columnar jointed basalt-concrete bonding interface(se&si)increases with the increase of the compressive strength of concrete.When concrete compressive strength rises from 22.2 to 27.6 MPa,the cohesion increases by 94%.

direct shear testbasalt-concrete bonding interfaceshear strength parametersengi-neering geogolgy

Peng Xia、Xinli Hu、Chunye Ying、Shuangshuang Wu、Chu Xu、Xuan Wang、Hao Chen、Hang Duan

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College of Harbour and Coastal Engineering,Jimei University,Xiamen 361021,China

Faculty of Engineering,China University of Geosciences,Wuhan 430074,China

China Three Gorges Construction Group,Ltd.,Beijing 100038,China

国家自然科学基金国际合作与交流重点项目国家自然科学基金中央高校基本科研业务费专项Scientific Research Project of China Three Gorges Corporation LTD

4202010400641630643CUGCJ1701

2024

10.1007/s12583-021-1594-9

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(2)
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