CAJ | 학술논문

膨胀土边坡中吸力降低会引起强度衰减，进而引起边坡变形破坏。采用热传导传感器监测干湿循环作用下膨胀土边坡模型坡顶和坡底的基质吸力，开展膨胀土边坡基质吸力随深度和时间变化规律的室内试验，并对模型破坏过程进行了分析。试验结果表明：膨胀土边坡因膨胀干缩的反复作用产生裂缝，为雨水入渗提供通道，裂缝区土体迅速吸水，吸力骤降；非裂缝区土体雨水难以入渗，吸力降低存在明显的滞后现象。降雨后一段时间内，裂缝区土体与非裂缝区土体强度差异明显。对于填方膨胀土边坡工程，建议填筑一部分后对其先进行晾晒，促使土体吸力增长并提高土体强度；施工过程中应避免降雨水入渗，并监测坡体含水率的变化和位移情况，及时采用有效处置措施，防止发生滑坡破坏。
팽창토변파중흡력강저회인기강도쇠감，진이인기변파변형파배。채용열전도전감기감측간습순배작용하팽창토변파모형파정화파저적기질흡력，개전팽창토변파기질흡력수심도화시간변화규률적실내시험，병대모형파배과정진행료분석。시험결과표명：팽창토변파인팽창간축적반복작용산생렬봉，위우수입삼제공통도，렬봉구토체신속흡수，흡력취강；비렬봉구토체우수난이입삼，흡력강저존재명현적체후현상。강우후일단시간내，렬봉구토체여비렬봉구토체강도차이명현。대우전방팽창토변파공정，건의전축일부분후대기선진행량쇄，촉사토체흡력증장병제고토체강도；시공과정중응피면강우수입삼，병감측파체함수솔적변화화위이정황，급시채용유효처치조시，방지발생활파파배。
By monitoring the surface and bottom matric suction of the expansive soil slope model under wet?ting-drying cycle with the thermal conductivity sensor, the laboratory tests were carried out on matric suc?tion of the expansive soil slope to study the variation with the different depth and time, and the damage process of the model were analyzed. The test results show that the expansive soil slope generated cracks which provide channels for the infiltration of rainwater as the repeated swelling-shrinkage cycle, so the crack area quickly absorb water and the matric suction drop;because the rainwater is not easy to infiltrate in non-cracking area, the decrease of matric suction show obviously hysteresis. After a period of raining, the strength of soil in crack area and non-cracking area has significant differences, which reach the maxi?mum in the second wetting. For the project of the filling expansive soil slope, we recommend that by dry?ing the soil soon after filling a part which may promote the growth of matric suction and to improve the strength of soil mass;it should avoid the rainwater infiltrating into the soil in the process of construction, and monitor the water content and the deformation of slope. It also should adopt promptly the effective mea?sures to prevent the occurrence of landslide failures.