CAJ | 학술논문

哈大铁路沿途广泛分布的季节性冻土，引起含不同细粉料的路基级配碎石垫层产生冻胀问题，不能满足高铁对线路平顺性的要求。通过掺入一定量的水泥，可以有效减少吸水量和冻胀量。基于相似理论开展了不同细粉含量、不同含水量及不同水泥掺量工况下路基级配碎石的冻胀特性研究，进行了4种细粉含量及4种水泥掺量条件下的孔隙率、含水率及冻胀量试验。结果表明：掺加水泥可显著降低级配碎石的冻胀率，未掺加水泥级配碎石其原位冻胀率可达1%~1.65%，随着水泥掺量的增加，掺水泥5%以上级配碎石硬化后基本可消除细粉土引起的原位冻胀和水迁移冻胀，其原位冻胀率小于0.2%。掺加水泥量必须同时考虑对冻胀率及物理力学性能的影响，建议水泥掺量为5%。
합대철로연도엄범분포적계절성동토，인기함불동세분료적로기급배쇄석점층산생동창문제，불능만족고철대선로평순성적요구。통과참입일정량적수니，가이유효감소흡수량화동창량。기우상사이론개전료불동세분함량、불동함수량급불동수니참량공황하로기급배쇄석적동창특성연구，진행료4충세분함량급4충수니참량조건하적공극솔、함수솔급동창량시험。결과표명：참가수니가현저강저급배쇄석적동창솔，미참가수니급배쇄석기원위동창솔가체1%~1.65%，수착수니참량적증가，참수니5%이상급배쇄석경화후기본가소제세분토인기적원위동창화수천이동창，기원위동창솔소우0.2%。참가수니량필수동시고필대동창솔급물리역학성능적영향，건의수니참량위5%。
Seasonal frozen soil are distributed widely along the Harbin-Dalian Railway Line.The problem of frost heaving is so caused with the graded broken stone bed course of the subgrade containing different contents of fine powder,thus the requirements of high-speed railway lines for smoothness cannot be met.The water ab-sorbing quantity and amount of frost heaving can be reduced effectively by adding a certain amount of cement. In this paper,in accordance with the similarity theory,the frost heaving characteristics of the subgrade built of graded crushed stones were studied under the operating conditions of different fine powder contents,different water bearing contents and different cement admixture contents.Tests of the void-cement ratio,dampness and amount of frost heaving were made respectively corresponding to four different fine powder contents and four cement admixture contents.The results show as follows:Addition of cement can significantly reduce the rate of frost heave of graded crushed stones;the in-site rate of frost heave reaches 1%~1 .6 5% without addtion of ce-ment admixture ;along with increasing of the cement content and when going up to more than 5% ,the in-site frost heave and water-migration frost heave caused by fine powder soil are basically eliminated after graded crushed stones get hardened and the in-site rate of frost heave remains less than 0.2%;the rate of frost heave and physical mechanical properties must be considered simultaneously when adding cement;the recommended content of cement admixture is 5%.