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取南水北调中线工程陶岔引水渠坡的膨胀土做试样,利用与电子计算机断层扫描X-Ray CT机配套使用的土工三轴仪,对圆柱孔破损重塑膨胀土样进行控制吸力为100kPa、200kPa和净围压为50kPa、100kPa、200kPa的CT-三轴压缩试验,通过CT扫描设备获得试验过程中土样内部破损结构的实时演化情况.试验结果表明:净围压在孔洞结构演化中发挥重要作用,净围压越大,CT数均值ME越大,破损孔洞面积缩小越明显,试样整体被压密;方差值SD越小,试样结构性趋于均匀.从ME值和SD值的变化可以看出,试验过程中试样逐渐被压密,破损结构有一定的修复.
Taking the expansive soil of Taocha diversion channel slope in the midline of South-to-North Water Diversion Project as sample, the geostrophic triaxial apparatus which is used with computerized tomography X-Ray CT machine is used to control the suction of 100MPa, 200kPa and net confining pressure of 50kPa, 100kPa and 200kPa, the real-time evolution of the damaged structure of the soil sample during the test was obtained by the CT scanning equipment.The results show that the net confining pressure plays an important role in the evolution of the pore structure The larger the net confining pressure, the larger the CT mean ME is, and the more the damaged hole area is reduced, and the whole sample is compacted. The smaller the variance SD is, the easier the structure of the sample tends to be. From ME value and SD As can be seen from the change of the value, the specimen is gradually compressed during the test, and the damaged structure has a certain degree of repair.