基于客运专线路基动静强度的全风化花岗岩路用性能

Research of mechanical behavior for static-dynamic strength of subgrade filled with completely weathered granite in passenger railway

为了扩大客运专线路基基床底层及以下部分路基本体填料的使用范围,基于客运专线路基动静强度要求,对全风化花岗岩及水泥改良土进行了静强度、动三轴试验,分析其静强度特性,以及在列车重复荷载作用下的动力特性,研究其临界动应力、累积塑性变形等变化规律及影响因素,论证其水泥改良土作为客运专线路基基床底层及以下部分路基本体填料的可行性和适用范围,确定化学改良土的强度指标控制标准。

For the demands of static - dynamic strength in passenger railway subgrade and extend limits of the fillings , by means of static - dynamic strength experiments and dynamic triaxial tests for completely weathered granite and its＇ improvement with cement, static - dynamic strength behavior and dynamic characteristic was analyzed, variation laws and influence factors of the critical dynamic stress and accumulated plastic deformation under reloaded by train were studied. The weathered granite improved with cement feasibility and suitable scope were proved to under the passenger railway subgrade base be filled by completely course. The standard of strength indexes under control was determined to completely weather granite improved with chemical method.