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采用直剪试验研究一体两介质和两体两介质接触界面力学性能的影响,以砂浆和混凝土构造宽度方向一致不同形状因子λ的不规则接触面,用以模拟工程体和地质体的相互作用。根据直剪试验,分析了一体两介质试件和两体两介质试件的破坏状态及应力–位移曲线,得到结论:界面黏结力和正应力对两介质接触面的力学性能有很大影响;形状因子λ在中低等法向力下对于两体两介质接触面的剪切力学性能有着重要的影响,在高法向应力下接触面的剪切力学性能则由弱介质的强度等因素决定;由于破坏的状态和受力的方式不同,在中低等法向力下,一体两介质的峰值抗剪强度大于两体两介质的峰值抗剪强度;在高法向应力下,恰恰相反。
Direct shear test is used to study the mechanical properties of the two media and the two media. The irregular contact surface with different shape factor λ in the width direction of the mortar and concrete is used to simulate the interaction between the engineering body and the geological body. According to the direct shear test, the failure state and the stress-displacement curve of the two media specimens and the two-body two-media specimens are analyzed. It is concluded that the interface adhesion force and the normal stress have a great influence on the mechanical properties of the two media contact surfaces. The factor λ has an important influence on the shear properties of the two media at the middle and low normal forces. The shear mechanics of the contact surface under high normal stress depends on the strength of the weak media and other factors. Due to the different states of failure and the way of stress, the peak shear strength of one medium and two medium is greater than the peak shear strength of two mediums under medium normal force. Under the high normal stress, the opposite is true.