CAJ | 학술논문

针对目前量测土体膨胀力的主要方法所存在的不足，提出近似完全限制条件下测量土体膨胀力的改进方法。以压实红黏土为研究对象，测到不同初始状态（含水率、干密度）试样的膨胀力，并与膨胀反压法测得的膨胀力进行对比分析，发现限制膨胀方法测得的膨胀力要小于膨胀反压法的试验值。同时，显现出限制膨胀法测膨胀力具有3个主要优点：试验过程中保持土体不发生变形，更加符合膨胀力的物理定义；试验耗时少、占空间少；能测较宽含水率范围内的膨胀力。最后，利用压汞法和氮吸附法测得不同状态下土体的细观孔隙结构分布特征。结果表明：相同干密度试样，制样含水率对压实土体的孔隙分布影响显著；黏土晶间和粒间吸水自由膨胀后发生“不可逆”膨胀变形；土体发生“不可逆”膨胀变形程度是引起限制膨胀法和膨胀反压法所得试验结果出现差异的主要原因。
침대목전량측토체팽창력적주요방법소존재적불족，제출근사완전한제조건하측량토체팽창력적개진방법。이압실홍점토위연구대상，측도불동초시상태（함수솔、간밀도）시양적팽창력，병여팽창반압법측득적팽창력진행대비분석，발현한제팽창방법측득적팽창력요소우팽창반압법적시험치。동시，현현출한제팽창법측팽창력구유3개주요우점：시험과정중보지토체불발생변형，경가부합팽창력적물리정의；시험모시소、점공간소；능측교관함수솔범위내적팽창력。최후，이용압홍법화담흡부법측득불동상태하토체적세관공극결구분포특정。결과표명：상동간밀도시양，제양함수솔대압실토체적공극분포영향현저；점토정간화립간흡수자유팽창후발생“불가역”팽창변형；토체발생“불가역”팽창변형정도시인기한제팽창법화팽창반압법소득시험결과출현차이적주요원인。
There are many defects of the main soil swelling pressure measuring methods at present. So, an improved method is put forward which could measure the soil swelling pressure under approximately completely restricted swelling conditions. Taking compacted laterite as study object, the swelling pressures of specimens have been measured at different initial water contents and dry densities. Comparing with the test results which belong to swell-consolidation method, it is indicated that the former swelling pressure values are less than the later ones. Meanwhile, the restricted swelling method has three major advantages. Firstly, it accords well with the definition of swelling pressure owning to the soil un-deformation after soaking. Secondly, it takes less time and occupies smaller space. Thirdly, it can measure swelling pressure within wide range of water content. Furthermore, the samples mesoscopic pore size distribution features under different conditions have been measured by mercury intrusion method and nitrogen adsorption method. The results show that the influence of sample water content is significant on the pore distribution of compacted laterite at the same dry density. The compacted laterite occurs “irreversible”swelling due to the incursion of water molecule into laterite crystal and grain. The“irreversible”swelling degree of laterite is major reason which brings to difference swelling pressure values between the restricted swelling method and swell-consolidation method.