CAJ | 학술논문

在自行研制的一套温度、压力、位移、水分均可控的人工冻土多功能冻胀试验系统上，开展了不同外载荷，单、双向冻结模式，预留一定冻胀量等不同外边界条件下黏土冻胀力试验。得出外荷载对冻胀力发展有明显抑制作用，冻胀力变化曲线由上凸型逐渐向下凹型过渡；冻结模式对冻胀力影响很大，双向冻结模式条件下使冻胀力增长明显，但增幅随冷源温度降低呈二次曲线衰减；同一试样的冻胀力与冻胀量可用二次抛物线来拟合。试验获得了更接近工程现场实际冻结工况下黏土冻胀特性，为多排管冻结设计提供参考。
재자행연제적일투온도、압력、위이、수분균가공적인공동토다공능동창시험계통상，개전료불동외재하，단、쌍향동결모식，예류일정동창량등불동외변계조건하점토동창력시험。득출외하재대동창력발전유명현억제작용，동창력변화곡선유상철형축점향하요형과도；동결모식대동창력영향흔대，쌍향동결모식조건하사동창력증장명현，단증폭수랭원온도강저정이차곡선쇠감；동일시양적동창력여동창량가용이차포물선래의합。시험획득료경접근공정현장실제동결공황하점토동창특성，위다배관동결설계제공삼고。
An artificial multifunctional frost heave test system was developed,which integrates the computer control of temperature,pressure,displacement and moisture.The heave force test of clay was conducted under various external loads,in uni-direction or two sideway freeze mode and re-serving a certain amount of heaving space.The external load has obvious inhibition on frost force de-velopment,with the frost force curve changing from upper convex form to lower concave form.The freezing mode has great impact on frost force,with the frost heave force increasing significantly under the two-sideway freezing model,but the increase rate attenuated by quadratic curve with the lowering of the cold source temperature.The frost heave force and frost heave of the same sample can be fit-ted by quadratic parabola.Clay heave characteristics close to the actual freezing conditions of con-struction projects were obtained,which may contribute to multi-tube freezing design.