the invention of sediment void ratio (void ratio) measurement as in, sediment samples X-ray City (X -ray CT), but tomography, X-ray CT tomographic image of the earth and sand in the void ratio by the X-ray CT tomography visualization is difficult even for fine soil of the gap member to have the SAT particles of a size smaller than the size of the minimum voxel The present invention relates to X-ray CT method for measuring void ratio of the fine soil through tomography to be able to measure.the present invention, X-ray CT tomographic image of the minimum voxel size smaller than the particle size of the SAT member has the void ratio and the known sample in standard soil for X-ray CT tomographic image acquire and (S1) X-ray CT tomography and CT numbers obtained for each voxel in the image (S2) Representative of the CT X-ray CT single shot region by calculating from each CT value (S3) Obtaining data representing the value of the void ratio of the CT and quarrying, and Building a database of the plurality of void ratio and the representative value CT for a plurality of types of standard soil samples otherwise the void ratio, and (S4) The CT value for each voxel from the X-ray CT tomographic image of a sample to be measured and the representative value CT soil estimating (S5) The void ratio for the calculation of the representative value CT, by obtaining from the database of the group establish a void ratio and the representative value CT (S6), characterized by measuring the void ratio of soil to be measured.본 발명은 토사의 간극비(void ratio)를 측정함에 있어서, 토사 시료를 엑스레이 씨티(X-ray CT) 단층촬영하되, X-ray CT 단층촬영 이미지의 최소 복셀의 크기보다 작은 크기의 토사체 입자를 가지고 있어서 공극의 가시화가 어려운 미세한 토사에 대해서도 X-ray CT 단층촬영을 통해 토사의 간극비를 측정할 수 있도록 하는 X-ray CT 단층촬영을 통한 미세 토사의 간극비 측정방법에 관한 것이다.본 발명은, X-ray CT 단층촬영 이미지의 최소 복셀의 크기보다 작은 크기의 토사체 입자를 가지고 있고 간극비를 이미 알고 있는 표준 토사 시료에 대해 X-ray CT 단층촬영 이미지를 취득하고(S1) X-ray CT 단층촬영 이미지에서 각각의 복셀에 대해 CT값을 구하고(S2) X-ray CT 단층촬영된 영역의 CT대표값을 각 CT값으로부터 산정하여(S3) CT대표값과 토사의 간극비의 데이터를 취득하고 상기 간극비를 달리
