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绢云母片岩是一种易崩解的片岩填料,在大气的长期干湿循环作用下,性能极易发生衰减、弱化。通过开展干湿循环前后不同初始最大粒径绢云母片岩的加州承载比试验和回弹模量试验,探讨其强度变化规律,并结合颗粒分析试验,从崩解的角度解释上述强度变化原因。结果表明,绢云母片岩在经历10次干湿循环作用后颗粒再无明显崩解,粒径为10 mm的颗粒可作为其崩解强弱的分界点,粒径大于10 mm的颗粒崩解较快,粒径小于10 mm的颗粒崩解较慢。绢云母片岩的回弹模量在初始最大粒径为5~10 mm时较大;而其承载比在初始最大粒径为10~20 mm时较大。结合崩解特性,选取初始最大粒径10 mm作为绢云母片岩路基填筑的控制粒径。
Sericite schist is a kind of disintegrating schist fillers. Under the action of long-term dry-wet circulation in the atmosphere, the properties are easily attenuated and weakened. By carrying out the California bearing ratio test and the springback modulus test of sericite schist with different initial and maximum diameters before and after the wetting and drying cycle, the variation rules of the strength of the sericite schist with different initial and maximum diameters are discussed, and the causes of the strength changes are explained from the disintegration point of view in combination with the particle analysis test. The results show that the sericite schist no obvious disintegration of the particles after 10 cycles of wetting and drying, particles with a particle size of 10 mm can be used as the demarcation strength of the break-point, particle size greater than 10 mm of the collapse of the particles The particles that are less than 10 mm in diameter collapse more slowly. The elastic modulus of sericite schist is larger when the initial maximum particle size is 5 ~ 10 mm, while its bearing ratio is larger when the initial maximum particle size is 10 ~ 20 mm. According to the disintegration characteristics, the initial maximum size of 10 mm was chosen as the controlled particle size of sericite schist subgrade filling.