CAJ | 학술논문

垫层料冻胀变形过大会影响面板坝的正常使用，研究表明，垫层料冻胀变形量大小与其级配及孔隙分布有关。为了研究寒冷环境下垫层料冻胀变形机制和规律，基于土颗粒为理想球体且完全均匀分布的假定，提出了垫层料孔隙分布模型，确定了等效孔隙直径及等效孔隙数量的计算办法。利用单向固结仪，进行了不同孔隙尺寸和不同孔隙数量垫层料的冻融循环试验，冻胀试验结果表明：垫层料冻胀量大小随孔隙尺寸和孔隙数量变化而变化。存在一个临界孔隙尺寸，小于该尺寸的孔隙越小、小孔隙越多，冻胀量越大；反之，冻胀量越小。基于孔隙分布模型，构造定义了孔隙分布指数，发现垫层料冻胀变形量与孔隙分布指数呈线性正相关关系。研究结果可为工程设计确定合理的垫层料级配提供参考。
점층료동창변형과대회영향면판패적정상사용，연구표명，점층료동창변형량대소여기급배급공극분포유관。위료연구한랭배경하점층료동창변형궤제화규률，기우토과립위이상구체차완전균균분포적가정，제출료점층료공극분포모형，학정료등효공극직경급등효공극수량적계산판법。이용단향고결의，진행료불동공극척촌화불동공극수량점층료적동융순배시험，동창시험결과표명：점층료동창량대소수공극척촌화공극수량변화이변화。존재일개림계공극척촌，소우해척촌적공극월소、소공극월다，동창량월대；반지，동창량월소。기우공극분포모형，구조정의료공극분포지수，발현점층료동창변형량여공극분포지수정선성정상관관계。연구결과가위공정설계학정합리적점층료급배제공삼고。
Concrete-faced-rockfill-dam (CFRD) cannot work properly if the cushion material has too much frost heave deformation. Recent researches have shown that:frost heave deformation of cushion material relates to its pore distribution and gradation. In order to reveal the mechanism of the frost heave of cushion material in cold environment, assumptions are adopted that soil particles are ideal spheres and their distribution is completely uniform, a pore distribution model of cushion material is put forward; and the methods are given for determining the equivalent pore diameter and equivalent pore number. Freeze-thaw cycling tests are carried out on one-way oedometer for different pore sizes and different pore quantities of cushion material. Laboratory frost heave tests results show that the frost heave deformation varies with the size and the quantity of the pore. There exists a critical pore size, when the pore is smaller than the critical size, the smaller the pore and the more the small pores, the greater the frost heave, and vice versa. Based on the proposed pore distribution model, a pore distribution index is defined;it is found to have linear positive correlation between the frost heave deformation of cushion material and this index. The results can be applied for the graduation design of cushion material.