CAJ | 학술논문

砾类土是新疆铁路和公路常用的路基填料，为了控制和减小砾类土路基的沉降，首先需要明确各因素对该类路基在循环荷载作用下的变形影响规律。通过动三轴试验研究围压、初始静偏应力、循环荷载作用频率、循环荷载大小和固结比对砾类土累计塑性变形的影响规律，得出其累计塑性应变随着初始静偏应力、循环荷载大小的增加而增大，随着围压、荷载作用频率和固结比增加而减小。同时计算各影响因素对累计塑形应变的极差，得出影响因素对累计塑形应变影响的大小。在路基施工时，可以通过提高路基的围压，同时使路基充分固结来减小路基的营运沉降。提出一种针对砾类土应变较小时的塑性累计变形模型，并验证模型的正确性，可为新疆砾类土路基的设计和施工提供参考。
력류토시신강철로화공로상용적로기전료，위료공제화감소력류토로기적침강，수선수요명학각인소대해류로기재순배하재작용하적변형영향규률。통과동삼축시험연구위압、초시정편응력、순배하재작용빈솔、순배하재대소화고결비대력류토루계소성변형적영향규률，득출기루계소성응변수착초시정편응력、순배하재대소적증가이증대，수착위압、하재작용빈솔화고결비증가이감소。동시계산각영향인소대루계소형응변적겁차，득출영향인소대루계소형응변영향적대소。재로기시공시，가이통과제고로기적위압，동시사로기충분고결래감소로기적영운침강。제출일충침대력류토응변교소시적소성루계변형모형，병험증모형적정학성，가위신강력류토로기적설계화시공제공삼고。
Gravel soil is the commonly used railway and highway subgrade filling in Xinjiang.In order to control and reduce settlement of embankment,it should be firstly confirmed that the change law of influencing factors on the gravel soil roadbed accumulative deformation under cyclic loading.The effect of confining pressure,the ini-tial static deviatoric stress,cyclic loading frequency,cyclic loading value and consolidation ratio on cumulative plastic strain of gravel soil was investigated through the dynamic triaxial tests.The accumulative deformation in-creases with the increasing value of initial static deviatoric stress and the cyclic loading;however,it shows an op-posite trend with the increase of confining pressure,cyclic loading frequency and consolidation ratio.At the same time,the cumulative plastic strain range under different influencing factors was calculated and their impact on the cumulative plastic strain were obtained.Thus in the subgrade construction,increasing confining pressure and consolidation ratio of gravel soil subgrade can be adopted to reduce operation settlement.A new model of gravel soil cumulative plastic strain arming at small plastic deformation was put forward and the correctness of the model was validated.The research results can provide reference for the design and construction of gravel soil subgrade in Xinjiang.