CAJ | 학술논문

土石坝(超)深厚覆盖层地基中的深埋细粒土抗地震残余变形能力较差，尤其是在土层厚度较大时，覆盖层地基连同坝体在强震作用下可能会产生较大的地震沉陷。针对我国西部某大型土石坝工程，对超深厚覆盖层地基中深埋粉砂层土的地震残余变形特性进行三轴试验研究。研究表明：试验土料级配曲线与相应土层各钻孔平均级配曲线很接近，试验土料的颗粒级配对实际土层的颗粒组成特性具有代表性；试验土料的地震残余变形特性主要受土体密度、固结条件和围压力条件等控制，尤其是固结比对土体地震残余变形特性影响较大；各因素对土体残余体积变形特性和轴向变形特性的影响规律有所差异。
토석패(초)심후복개층지기중적심매세립토항지진잔여변형능력교차，우기시재토층후도교대시，복개층지기련동패체재강진작용하가능회산생교대적지진침함。침대아국서부모대형토석패공정，대초심후복개층지기중심매분사층토적지진잔여변형특성진행삼축시험연구。연구표명：시험토료급배곡선여상응토층각찬공평균급배곡선흔접근，시험토료적과립급배대실제토층적과립조성특성구유대표성；시험토료적지진잔여변형특성주요수토체밀도、고결조건화위압력조건등공제，우기시고결비대토체지진잔여변형특성영향교대；각인소대토체잔여체적변형특성화축향변형특성적영향규률유소차이。
The seismic capacity of residual deformation of the fine-grained soils which are buried deeply in super-deep overburden layer is poor,and a great seismic settlement of dam-foundation system may be produced by the earthquake when the thickness of soil layer is large.So it is signif-icant for the anti-seismic design of dam to study the seismic residual deformation characteristics of soil and determine the corresponding characteristic parameters.In the paper,a series of dynamic triaxial tests on silty sands buried deeply in the super-deep overburden layer foundation of an earth-rock fill dam in China are carried out,and the seismic residual deformation characteristics of soils in earthquake are analyzed.The results show that:(1)the grading curve of testing soil is con-sistent with the mean grading curve of corresponding drill on field soils,and the grain composition properties of field soils can be represented by the testing soil;(2)the seismic residual deformation characteristics of testing soil is influenced by the density of soil and the stress condition,and the consolidation ratio is a significant influencing factor;(3)the influencing laws of factors on axial deformation characteristics and those on residual volumetric deformation of soils are different.