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通过在RMT-150B岩石力学系统基础上自行改进的高应力直剪仪,对不同含水率的粗砂与不同硬度和粗糙度的混凝土结构接触面进行粗砂与混凝土结构接触面颗粒破碎试验研究。结果表明,高法向应力粗砂与混凝土结构接触面直剪试验后颗粒级配曲线相较于试验前的曲线所对应出的颗粒粒径含量,随粒径的减小呈现出先减小后增加趋势,在颗粒粒径为0.25~0.074mm段,试验前后两级配曲线相互靠拢,对应粒径的含量变化较小;干粗砂破碎相较于含水的粗砂总体上破碎率较大,大粒径颗粒砂随含水率增大破碎量增大,小粒径颗粒砂随含水率增大呈现破碎减小状态,而含水率的大小对颗粒破碎影响相差不大;结构接触面的混凝土强度为C20、C30,粗糙度为3mm时,颗粒相对破碎率最小,结构接触面的混凝土强度为C40、C50表现与之相反;随着混凝土强度的增加,粗糙类型-破碎率曲线随粗糙度波动的敏感度变小,在混凝土结构接触面强度为C40时粗糙类型-破碎率曲线随粗糙度波动敏感度最小。
By means of the high-stress direct shear tester self-developed on the basis of the RMT-150B rock mechanics system, the particle crushing test is conducted on the contact surface between grit and concrete structure with different water content of grit and contact surface of concrete structure with different hardness and roughness. The results show that the particle size distribution of the particle grading curve at the interface between the high normal stress grit and the concrete structure is smaller than the particle diameter corresponding to the curve before the experiment, Trend in the particle size of 0.25 ~ 0.074mm segment before and after the test two curves close to each other, the corresponding changes in the content of smaller particle size; dry grit crushed water grit larger overall fragmentation rate larger Particle size of sand with increasing moisture content increased the amount of crushing, small particle size of sand with the water content increased crushing to reduce the state, and the water content of the size of the impact of particle crushing little difference; concrete contact surface of the concrete strength C20 and C30, the relative breaking rate of the particles is the smallest when the roughness is 3mm. The concrete strength of the structure contact surface is C40 and the C50 is the opposite. With the increase of the concrete strength, the roughness type - the fracture rate curve is sensitive to the roughness fluctuation Degree of smaller, in the concrete structure of the contact surface strength of C40 when the roughness type - broken rate curve with the least sensitivity to roughness fluctuations.