CAJ | 학술논문

通过对南宁膨胀性泥岩重塑土样进行变形量分别为0,0.2,0.5和1 mm的微变形膨胀力试验,分析膨胀力的主要影响因素,建立膨胀力与干密度、初始含水率双因素之间关系,研究微变形条件下膨胀力变化机制.结果表明:(1)零变形时,膨胀力随干密度增大呈指数形式增大,并与初始含水率呈幂函数关系.(2)微变形时,膨胀力随变形增大而衰减明显,在干密度大、初始含水率低时衰减幅度较大,反之较小;在干密度及初始含水率一定时,微变形膨胀力随着变形率增大而呈指数衰减.(3)微变形与零变形膨胀力之比随变形率增大而呈指数减小,当变形率为1%,2.5%和5%时,微变形膨胀力与对应零变形膨胀力之比分别为75%,55%和35%.
통과대남저팽창성니암중소토양진행변형량분별위0,0.2,0.5화1 mm적미변형팽창력시험,분석팽창력적주요영향인소,건립팽창력여간밀도、초시함수솔쌍인소지간관계,연구미변형조건하팽창력변화궤제.결과표명:(1)령변형시,팽창력수간밀도증대정지수형식증대,병여초시함수솔정멱함수관계.(2)미변형시,팽창력수변형증대이쇠감명현,재간밀도대、초시함수솔저시쇠감폭도교대,반지교소;재간밀도급초시함수솔일정시,미변형팽창력수착변형솔증대이정지수쇠감.(3)미변형여령변형팽창력지비수변형솔증대이정지수감소,당변형솔위1%,2.5%화5%시,미변형팽창력여대응령변형팽창력지비분별위75%,55%화35%.
A series of expansive force tests of small deformation as 0,0.2,0.5 and 1 mm were conducted on the remolded samples of expansive soil in Nanning to obtain the key influence factors of the expansive force. A formula of the expansive force with initial water content and dry density was given;and small deformation expansion force variation law was analyzed. The results show that:(1) When the expansive force test shows non-deformation,the expansive force increases exponentially with dry density increases and presents a power function relation with the initial water content. (2) Test of small deformation shows that the expansive force attenuates obviously with the deformation increases;in the condition of high dry density and low initial water content,the amplitude of attenuation are larger;otherwise smaller. Under constant dry density and initial water content,the small deformation expansive force exponentially attenuates with the deformation rate increases. (3) The expansive force ratio of non-deformation and small deformation decreases exponentially with the increase of deformation rate;when the deformation rate is 1%,the ratio of small deformation expansive force to non-deformation expansive force is 75%;this ratio is 55%when the deformation rate is 2.5%;and this ratio is 35%when the deformation rate is 5%.