CAJ | 학술논문

为了避免路基沉降导致路面结构破坏，对适用于山区公路半填半挖路基的沉降控制指标和标准进行了研究。首先，基于常泊松比假定，推导了三维Merchant模型的Prony级数表达式，并以ABAQUS为工具建立了半填半挖路基沉降计算模型。计算结果表明，半填半挖路基工后沉降曲线为“勺”形或“S”形，曲线形状的差异揭示了路基沉降的时空耦合效应。其次，基于路基工后沉降机制分析，提出了如下假定：半填半挖路基工后沉降曲线为中心对称的“S”形，对称中心两侧的曲线段为抛物线。通过沥青路面结构对抛物线形路基沉降的力学响应分析，揭示了路面结构附加弯拉应力与抛物线方程的二次项系数a具有线性关系，据此提出采用a值作为半填半挖路基沉降控制指标。最后，基于沥青路面结构在交通荷载和路基沉降共同作用下的破坏模式，提出了半填半挖路基沉降控制标准的确定方法。研究成果为合理控制半填半挖路基工后沉降提供了明确的技术依据。
위료피면로기침강도치로면결구파배，대괄용우산구공로반전반알로기적침강공제지표화표준진행료연구。수선，기우상박송비가정，추도료삼유Merchant모형적Prony급수표체식，병이ABAQUS위공구건립료반전반알로기침강계산모형。계산결과표명，반전반알로기공후침강곡선위“작”형혹“S”형，곡선형상적차이게시료로기침강적시공우합효응。기차，기우로기공후침강궤제분석，제출료여하가정：반전반알로기공후침강곡선위중심대칭적“S”형，대칭중심량측적곡선단위포물선。통과력청로면결구대포물선형로기침강적역학향응분석，게시료로면결구부가만랍응력여포물선방정적이차항계수a구유선성관계，거차제출채용a치작위반전반알로기침강공제지표。최후，기우력청로면결구재교통하재화로기침강공동작용하적파배모식，제출료반전반알로기침강공제표준적학정방법。연구성과위합리공제반전반알로기공후침강제공료명학적기술의거。
To avoid pavement structure failure induced by subgrade settlement, index and criterion for settlement control applicable to cut-and-fill subgrade for mountain-highways are studied. Firstly, the Prony series expressions for three-dimensional Merchant model are deduced based on constant Poisson’s ratio hypothesis;and the settlement calculation models of cut-and-fill subgrade were established with ABAQUS. The calculations indicate that post-construction settlement curves of cut-and-fill subgrade are spoon-shaped or S-shaped. The difference in curve shape reveals the time-space coupling effect in subgrade settlement. Secondly, the following hypothesis is proposed based on post-construction settlement mechanisms: the post-construction settlement curves of cut-and-fill subgrade are central symmetric S-shaped curves composed of two parabolic segments. The mechanical response of asphalt pavement under parabolic subgrade settlement indicates that the additional flexural-tensile stress is linear with quadratic term coefficient of parabolic equation which, consequently, can be adopted as settlement control index applicable to cut-and-fill subgrade. Finally, the method of defining settlement control criterion applicable to cut-and-fill subgrade is presented based on the failure modes of asphalt pavement under traffic load and subgrade settlement. The research findings provide a technical foundation for post-construction settlement control of cut-and-fill subgrade.