CAJ | 학술논문

膨胀土在含水量降低时发生干缩开裂，给工程带来了极大的危害，其中降雨条件下裂隙膨胀土渗流问题是一个典型的膨胀土工程问题。制备6个相同的南阳重塑膨胀土样，在相同的环境下分别脱湿96，79，63，48，39，30 h，通过数码拍照得到不同时刻试样表面裂隙图片，通过分析得到试样表面裂隙率；为了衡量裂隙在深部方向的发育情况，使用煤油进行渗透实验，得到煤油入渗系数与脱湿时间、平均含水率、表面裂隙率的关系曲线；在油渗实验结束后进行室内模拟降雨入渗实验，得到裂隙膨胀土入渗率的变化规律。通过对实验数据整理分析发现试样脱湿时间、试样平均含水率、试样表面裂隙率、煤油入渗系数、降雨入渗实验径流开始时间、试样入渗率之间有良好的相互关系，降雨入渗实验初期入渗率较大，入渗率随时间衰减很快，在15 min内降低了两个数量级，脱湿时间越长的样初期入渗率越高，衰减的也越快；入渗率在较短的时间内就开始趋于稳定，稳定后的入渗率随试样表面裂隙率线性增长，增长到一个峰值后迅速降低。
팽창토재함수량강저시발생간축개렬，급공정대래료겁대적위해，기중강우조건하렬극팽창토삼류문제시일개전형적팽창토공정문제。제비6개상동적남양중소팽창토양，재상동적배경하분별탈습96，79，63，48，39，30 h，통과수마박조득도불동시각시양표면렬극도편，통과분석득도시양표면렬극솔；위료형량렬극재심부방향적발육정황，사용매유진행삼투실험，득도매유입삼계수여탈습시간、평균함수솔、표면렬극솔적관계곡선；재유삼실험결속후진행실내모의강우입삼실험，득도렬극팽창토입삼솔적변화규률。통과대실험수거정리분석발현시양탈습시간、시양평균함수솔、시양표면렬극솔、매유입삼계수、강우입삼실험경류개시시간、시양입삼솔지간유량호적상호관계，강우입삼실험초기입삼솔교대，입삼솔수시간쇠감흔쾌，재15 min내강저료량개수량급，탈습시간월장적양초기입삼솔월고，쇠감적야월쾌；입삼솔재교단적시간내취개시추우은정，은정후적입삼솔수시양표면렬극솔선성증장，증장도일개봉치후신속강저。
The crack of expansive soil occurs when the moisture content reduces,which brings great harm to the project. Fissured expansive soil seepage under rainfall is a typical engineering problem. In this paper,6 identical remolded Nanyang expansive soil samples were prepared,which were dried for 96,79,63,48,39 and 30 h in the same environment,respectively. Surface crack images at different times were obtained with digital camera,and surface fracture rate was obtained through images analysis. To measure crack development in the deep direction,the kerosene is used for infiltration experiments,and get the curves of oil seepage coefficient and desorption time,average moisture content,surface crack rate were secured through experiments;the law of fissured expansive soil permeability coefficient variation was got by the indoor simulated rainfall experiments. Through analysis of the experimental data,we find out that there exist good relationship among sample desorption time,surface cracks rate,average moisture content,oil seepage coefficient,the starting time of rainfall runoff and infiltration rate. In the initial infiltration,infiltration rate decay with time soon,reduces two orders of magnitude within 15 min;the initial infiltration rate of longer dewetting samples was higher and was with faster decay;infiltration rate stabilizes in a short time;the stabilized infiltration rate increases linearly with the surface crack rate to a peak and then decreases rapidly.