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利用改进的循环单剪试验系统进行粉质黏土–混凝土接触面剪切性能试验。混凝土表面粗糙度分为光滑、一般和粗糙3种状态,法向压力为5～200 kPa,土样厚度分为10,20 mm两种情况,主要考查接触面粗糙度、法向压力以及试验选取的土样厚度对接触面剪切性能的影响规律。试验结果表明:接触面主要表现出2种破坏模式,一种是接触面附近土体自身剪切破坏,另一种是接触面滑移破坏,接触面的强度即为这2种破坏强度的下限,接触面加载路径最终达到哪一段强度曲线决定接触面的应力–应变特性;接触面粗糙度和法向压力越大,越趋向于土体自身剪切破坏;土样厚度对试验测得的接触面应力–应变曲线存在影响,但这种影响随着接触面粗糙度和法向压力的增大而减小。
Experimental study on shearing performance of silty clay - concrete interface with improved cyclic single shear test system. Concrete surface roughness is divided into smooth, normal and rough three kinds of state, the normal pressure of 5 ~ 200 kPa, soil thickness is divided into 10,20 mm two cases, mainly to check the contact surface roughness, normal pressure and test selection Influence of thickness of soil sample on the shearing property of contact surface. The results show that there are two failure modes in the contact surface, one is the shear failure of the soil near the contact surface, and the other is the sliding damage of the contact surface. The strength of the contact surface is the lower limit of the two kinds of damage intensity , The contact surface loading path finally reached which section of the strength of the curve determines the contact surface of the stress-strain characteristics; contact surface roughness and normal pressure, the greater the tendency of the soil itself shear failure; soil thickness of the test measured contact Surface stress-strain curves have an effect, but this effect decreases with increasing contact surface roughness and normal pressure.