CAJ | 학술논문

通过室内试验，考察了去离子水及不同浓度总氮溶液对土体物理力学性能的影响，并通过土体矿物成分含量及微观形貌分析，对总氮溶液与土体作用机制进行了初步探讨。结果表明，总氮对土体物理力学性能影响明显：（1）土体塑性指数、相对密度和有效黏聚力随总氮溶液浓度增大而减小，有效内摩擦角随溶液浓度的增大而增大；（2）各浸泡条件下，土体应力-应变关系曲线变化规律基本一致，均呈应变硬化现象，土体剪切峰值随总氮溶液浓度的增大先减小后增大；（3）孔隙水压力随轴向应变的增加先增加，然后缓慢降低，最后曲线逐渐趋于水平，表现出较大的剪胀性；（4）总氮溶液与土体间相互作用主要包括离子交换作用、微生物分解作用和溶蚀及胶结作用，这些作用通过改变土体的矿物成分含量，使其微观形貌及孔隙特征发生明显变化，最终导致土体的宏观力学特性改变。
통과실내시험，고찰료거리자수급불동농도총담용액대토체물리역학성능적영향，병통과토체광물성분함량급미관형모분석，대총담용액여토체작용궤제진행료초보탐토。결과표명，총담대토체물리역학성능영향명현：（1）토체소성지수、상대밀도화유효점취력수총담용액농도증대이감소，유효내마찰각수용액농도적증대이증대；（2）각침포조건하，토체응력-응변관계곡선변화규률기본일치，균정응변경화현상，토체전절봉치수총담용액농도적증대선감소후증대；（3）공극수압력수축향응변적증가선증가，연후완만강저，최후곡선축점추우수평，표현출교대적전창성；（4）총담용액여토체간상호작용주요포괄리자교환작용、미생물분해작용화용식급효결작용，저사작용통과개변토체적광물성분함량，사기미관형모급공극특정발생명현변화，최종도치토체적굉관역학특성개변。
In order to find the effect of total nitrogen on soil physico-mechanical performance, samples have been tested with deionized water and total nitrogen solution with different concentrations in laboratory, and the interaction mechanisms of soil and total nitrogen was revealed by mineral and microscopic analysis. The results show that the total nitrogen has significant influence on soil physico-mechanical performance. Plasticity indices, specific density and effective cohesive strength of samples decrease with increasing of concentration of total nitrogen solution, and the effective friction angle increases;Strain hardening phenomenon appears in the stress-strain relationships, and the variation of stress-strain curves of samples soaked in deionized water and total nitrogen solution are almost the same. The peak shear strength of samples manifests as a trend of decreases at first and then increases with increasing of concentration of total nitrogen solution;with the increase of axial strain, pore water pressure of sample is increased at first and then decreased gradually, and tends to be horizontal direction in the end; while the shear dilatation is evident; mineral composition, microstructure and physico-mechanical performance of soil are affected by the interaction between total nitrogen and soil, including ion exchange, microbial decomposition, dissolution and cementation.