Abstract：The Victorian brown coal is usually considered as a kind of intermediate geotechnical material (IGM), which has the properties between traditional rocks and soft soils. The brown coal is rich in organic matters and has complex textures and physical composition. It has different basic geotechnical index values from soft clays including low density and specific gravity, high water content, large void ratio and a relatively low hydraulic conductivity. The consolidation tests are carried out using the undisturbed brown coal samples, and the test results show special deformation behaviors of the brown coal. There is an instantaneous settlement at the early stage of the consolidation process, and the immediate settlement contributes to more than 50% of the total settlement occurring in the first several minutes. The Casagrande graphic method is not applicable to the brown coal to determine parameter t90 and other parameters. Even the traditional Terzaghi’s consolidation theory can not describe the consolidation curves appropriately. The constant head tests are designed and carried out under relatively low confining pressures. The test results show that the brown coal has a relatively low hydraulic conductivity.
刘侃, 李忠诚, 杨敏. 维多利亚褐煤的固结和渗透特性试验研究[J]. 岩土工程学报, 2019, 41(S2): 113-116.
LIU Kan, LI Zhong-cheng, YANG Min. Experimental study on consolidation and hydraulic behaviors of Victorian brown coal. Chinese J. Geot. Eng., 2019, 41(S2): 113-116.
[1] LI C Z.Advances in the science of Victorian brown coal. Elsevier, 2004. [2] ROBERT S Y, DENNIS E C.Shrinking, swelling and true density of Morwell brown coal[J]. Fuel, 1990, 69(5): 648-650. [3] COVEY G H, STANMORE B R.Rheological behavior of Victorian brown coal[J]. Fuel, 1980, 59(2): 123-127. [4] LIU K, MACKAY R, XUE J F, et al.Experimental study of brown coal hydraulic behavior at low confining stress[C]// Unsaturated Soils: Research and Applications-Proceedings of the 6th International Conference on Unsaturated Soils, Sydney, 2014: 1125-1130. [5] COULING C, TOLOOIYAN A, MACKAY R, et al.Measurement of pore water pressure properties of unsaturated brown coal using triaxial test[C]// Unsaturated Soils: Research and Applications-Proceedings of the 6th International Conference on Unsaturated Soils, Sydney, 2014: 1531-1535. [6] 刘侃, 杨敏. 泥炭土的概念模型和一维固结理论分析[J]. 水利学报, 2015, 46(增刊1): 225-230. (LIU Kan, YANG Min.A conceptual model and one-dimensional consolidation theory for peat[J]. Journal of Hydraulic Engineering, 2015, 46(S1): 225-230. (in Chinese)) [7] LIU K, XUE J F, YANG M.Deformation behaviour of geotechnical materials with gas bubbles and time dependent compressible organic matter. Engineering Geology, 2016, 213: 98-106.
