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

Abstract

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 s _e (symbolic meaning see Table 1); the bonding interface is sheared with rupture surface, termed as s _i. 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 (s _e & s _i) of columnar jointed basalt with concrete is greater than that of the bonding interface (s _e & s _i) of non-columnar jointed one with the same rock type grade. When the rock type grade is III₂, f _col is 1.22 times higher than f _ncol and c _col is 1.13 times greater than c _ncol. The shear strength parameters of the basalt-concrete bonding interface differ significantly for different lithologies. The cohesion of the bonding interface (s _i) of cryptocrystalline basalt with concrete is 2.05 times higher than that of the bonding interface (s _i) 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 (s _e & s _i). c _nol 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 (s _i) cohesion 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 (s _e & s _i) 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%.

Keywords

direct shear test / basalt-concrete bonding interface / shear strength parameters / engineering geogolgy

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