天然状态下存在大量的非饱和黄土。因此,非饱和黄土中存在的基质吸力在很大程度上可以控制抗剪强度。本次研究的非饱和黄土土样采自中国兰州市,用以展开室内试验,探讨黄土中基质吸力的变化规律以及其脱离含水量的影响因素。结果显示：结构性、矿物成分以及可溶盐含量是控制非饱和黄土基质吸力变化的最重要的三个影响因素。其中,残余含水量和土样密度有相反的相互关系。土样中存在大量的蒙脱石和伊利石的互层（I/S）,以及土样中存在的可溶盐也在某种程度上影响着基质吸力的变化。%There area a large number of unsaturated loess in the natural state.Therefore,matrix suction of unsaturated loess can control shear strength to a great extent.The unsaturated loess samples of this study collected from Lanzhou City,which to expand the indoor test,to discuss the change rule of matrix suction and the influence factors of from moisture in loess.The results showed that structural,mineral composition and soluble salt content are three most important factors of controlling the matrix suction change of unsaturated loess.Among them,the residual water content and density of loess sample have the opposite relationship.There are a large number of interpenetrating layers of montmorillonite and illite in the loess sample（I/S）,and to some extent,the soluble salt existed in the loess sample also affect the change of matrix suction.
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