CAJ | 학술논문

通过桩网加筋路堤足尺模型试验，研究速度324 km/h 时列车120万次轮轴动荷载作用下，桩帽高度位置和3.2 m 路基范围内动土压力随振次的变化规律，分析长期动荷载作用下土拱演化规律。试验结果表明：桩土差异沉降较大时，桩帽承担约90%的动荷载和静荷载，土拱加强了路基中动应力往桩帽的传递，路基中动应力分布按 Boussinesq 公式计算不合理；长期动荷载作用下，桩土动应力比减小，但幅度变化不大，说明土拱弱化不明显。
통과장망가근로제족척모형시험，연구속도324 km/h 시열차120만차륜축동하재작용하，장모고도위치화3.2 m 로기범위내동토압력수진차적변화규률，분석장기동하재작용하토공연화규률。시험결과표명：장토차이침강교대시，장모승담약90%적동하재화정하재，토공가강료로기중동응력왕장모적전체，로기중동응력분포안 Boussinesq 공식계산불합리；장기동하재작용하，장토동응력비감소，단폭도변화불대，설명토공약화불명현。
Through a full scale model test on pile-supported reinforced embankment,by exerting 1.2 m times dynamic axle load to the embankment under the condition of a train moving at a speed of 324 km/h,this paper studied the variation of dynamic soil stress with vibration times at the level of pile caps and in the 3.2 m em-bankment range.The development of the soil arch under long-term dynamic load was analyzed as well.The ex-periment results showed that when the pile-soil differential settlement was relatively large,the pile caps sus-tained nearly 90 percent of static load and dynamic load.As the soil arch strengthened the transmission of the dynamic stress in the embankment to the pile cap,the Boussinesq equation was not applicable to the calculation of distribution of dynamic stress in the embankment.Under long-term dynamic loads,the dynamic pile-soil stress ratio decreased,but the decrease was slight,indicating minor degeneration of the soil arch.