CAJ | 학술논문

与降雨有关的边坡表层变形位移，其根源是基质吸力降低引起的非饱和土体积应变。利用某滑坡体的原状样及其重塑样，分别在100kPa、200kPa 围压作用下，采用单纯增加基质吸力的应力路径，对基质吸力引起的体积应变，进行试验测试。结果显示：（1）试样的体应变，随基质吸力的增大，单调增大，服从对数函数关系；（2）围压由100kPa 增加到200kPa 的试样体积模量，随基质吸力的增大，单调增大，服从幂函数关系；（3）与基质吸力有关的体积变化系数，随基质吸力的增大，单调减小，服从幂函数关系；并且当基质吸力大于200kPa 以后，随基质吸力增大，体积变化系数接近于常数，约为0．0059左右。在此基础上，本文针对这种由单纯基质吸力变化引起的非饱和土体积应变规律及机理，进行了探讨。
여강우유관적변파표층변형위이，기근원시기질흡력강저인기적비포화토체적응변。이용모활파체적원상양급기중소양，분별재100kPa、200kPa 위압작용하，채용단순증가기질흡력적응력로경，대기질흡력인기적체적응변，진행시험측시。결과현시：（1）시양적체응변，수기질흡력적증대，단조증대，복종대수함수관계；（2）위압유100kPa 증가도200kPa 적시양체적모량，수기질흡력적증대，단조증대，복종멱함수관계；（3）여기질흡력유관적체적변화계수，수기질흡력적증대，단조감소，복종멱함수관계；병차당기질흡력대우200kPa 이후，수기질흡력증대，체적변화계수접근우상수，약위0．0059좌우。재차기출상，본문침대저충유단순기질흡력변화인기적비포화토체적응변규률급궤리，진행료탐토。
The slope surface deformation and displacement are related to the precipitation.The root cause is volumetric strain caused by suction decreasing in unsaturated soils.By simply increasing the suction stress path, under net confining pressure of 100kPa or 200kPa,the test of volumetric strain due to suction is done on undisturbed landslide samples and its remolded sample.The results show:(1)The volumetric strain of the specimen monotonically increases with suction increasing,which obeys logarithm function relation;(2)Bulk modulus during net confining pressure from 100kPa to 200kPa,monotonically increases with suction increasing,which obeys the power function relationship;(3)Coefficient of volume change associated with the suction monotonically decreases with suction increasing,which obeys the power function relationship.When the suction is greater than 200kPa,with the suction increases,the volume change of coefficients is close to a constant of about 0.0059.Based on these results,the pattern and mechanics of volumetric strain caused by a simple suction change are discussed in this paper.