【摘要】 东北黑土具有较高的有机质含量,已有研究表明,有机质对土的工程性质影响较为显著.为分析东北黑土的工程力学性质,进行了室内一维压缩试验、三轴试验、膨胀试验和干缩试验.试验结果表明,东北黑土属于低液限有机质粉质粘土,有机质含量为中级,土质坚硬,级配良好.东北黑土为高压缩性土,屈服应力在75Kpa至82Kpa之间.固结不排水强度随围压升高而增大,破坏形式为塑性破坏.东北黑土为中级膨胀性土,有机质是造成膨胀的原因.东北黑土线缩率为0.34,受有机质的影响,失水干缩过程较为缓慢.更多还原

【Abstract】 The black soil has the high content of organic, and the relative research shows that the organic matter has obviously affected on engineering properties.For analysis the engineering mechanical properties of the northeast black soil, the one-dimensional compression test, triaxial test, expansion and contraction test have been proceeded.The experimental result shows as follows, the northeast black soil belongs to MLO by testing of basic physical and mechanical indices, the northeast black soil has a middle content organic, hard property, and good grading.The northeast black soil has highly compressed property, the yield stress of 75 Kpa to 82 Kpa.The undrained strength of consolidation increased with the increase of cell pressure, and the destruction of soil is plastic failure.For expansion properties, the northeast black soil is middle swelling soil, and organic matter affect the swelling property of black soil.The shrinkage coefficient of northeast black soil equal to 0.34,and organic matter leads the slowly progress of shrinkage.更多还原