水岩作用下岩石-混凝土界面强度劣化特征研究

Study on Deterioration Characteristics of Rock-Concrete Interface Strength under Water-Rock Action

岩石-混凝土工程体广泛存在于岩土工程领域,对岩土工程结构稳定性具有重要影响。以水岩作用下岩石-混凝土工程体界面强度劣化特征为研究对象,通过不同干湿循环次数条件下岩石-混凝土工程体剪切强度试验,分析水岩作用下岩石-混凝土工程体劣化机理。结果表明,根据不同水岩作用下岩石-混凝土工程体界面剪切试验结果,水岩作用对岩石-混凝土工程体界面剪切强度具有损伤作用,岩石-混凝土工程体界面剪切强度随着干湿循环次数的增加而逐渐减小;岩石-混凝土工程体界面粗糙度系数越大,岩石-混凝土工程体剪切强度也越大;岩石-混凝土工程体剪切强度与冻融循环次数演化关系符合指数函数变化特征,并据此建立水岩作用下岩石-混凝土工程体界面强度劣化模型。

Rock-concrete geological body widely exists in the field of geotechnical engineering,which has an important impact on the stability of geotechnical engineering structures.Taking the deterioration characteristics of rock-concrete interface strength under water-rock action as the research object,the deterioration mechanism of rock-concrete geological body under water-rock action is analyzed through shear strength tests of rock-concrete geological body under different dry-wet cycles.The results show that according to the shear test results of rock-concrete geological body interface under different water-rock interaction,the water-rock interaction has a damaging effect on the shear strength of rock-concrete geological body interface,and the shear strength of rock-concrete geological body interface gradually decreases with the increase of dry and wet cycles.The greater the interface roughness coefficient of rock-concrete geological body,the greater the shear strength of rock-concrete geological body.The evolutionary relationship between the shear strength of rock-concrete geological body and the number of freeze-thaw cycles is in line with the exponential function,which establishes the deterioration of rock-concrete interface strength under the action of water and rock.