伊犁谷地黄土分布广泛，人类经济活动在黄土分布区较为频繁，伊犁谷地地质灾害多发生在黄土分布区，严重危及了当地人民的生命财产安全。研究区内以滑坡为主的地质灾害主要发生在春夏季节，时值融雪期，该阶段冻融环境下黄土性质的劣化是造成滑坡等灾害发生的主要因素。因此，研究冻融作用下伊犁谷地黄土的性质劣化规律十分重要。论文依托“南疆兵团师市规划设计区资源环境综合地质调查”二级委托项目“伊犁谷地黄土工程地质性质测试与对比分析”项目，对冻融环境下伊犁黄土工程性质劣化规律开展研究，得到如下成果：

（1）研究得到了伊犁谷地黄土的物理性质、水理性质和力学性质及黄土工程性质区域分布规律。研究区西部地区黄土的砂含量较大，而东部地区黄土的细粒含量较大，东部地区黄土天然含水率明显高于西部地区；自西北至东南方向上，黄土液限和塑性指数逐渐增加，湿陷性系数逐渐增加而渗透系数逐渐减小，黄土的抗剪强度和无侧限抗压强度逐渐增加。土体的c值逐渐增大，而值逐渐减小。

（2）揭示了冻融循环作用下原状黄土的强度劣化规律及不同区域内伊犁黄土强度损伤率的差异性。随着冻融循环次数的增加，土样的峰值破坏强度呈现降低的规律。研究区内东部地区黄土含水率更高，其受到冻融循环作用的影响更大，强度损伤率更高。

（3）揭示了冻融循环作用下原状黄土的渗透特性劣化规律及不同区域内伊犁黄土渗透特性劣化程度的差异性。随着冻融循环次数的增加，试样在相同重力下的自重变形量增大，累计变形量增加，渗透系数增加，这是由于冻融作用破坏了原状土的结构性，使得土体内部孔隙比增加，裂缝扩大。研究区内东部地区黄土含水率更高，在相同的冻融作用下，其渗透系数劣化的程度更大。

本文研究可进一步丰富伊犁黄土的工程性质数据，为区域性黄土的分布规律研究提供有益参考。

The loess in the Ili Valley is widely distributed, and human economic activities are more frequent in the loess distribution area. Geological disasters in the Ili Valley mostly occur in the loess distribution area, which seriously endangers the safety of local people 's lives and property. The geological disasters dominated by landslides in the study area mainly occur in spring and summer, during the snowmelt period. The deterioration of loess properties in the freeze-thaw environment at this stage is the main factor causing landslides and other disasters. Therefore, it is very important to study the deterioration law of loess properties in Ili Valley under freeze-thaw action. Based on the second-level commission project of ' Comprehensive Geological Survey of Resources and Environment in Planning and Design Area of Southern Xinjiang Corps Division City ' ' Test and Comparative Analysis of Engineering Geological Properties of Loess in Ili Valley ', this paper studies the deterioration law of engineering properties of loess in Ili under freeze-thaw environment, and obtains the following results.

( 1 ) The physical properties, water physical properties and mechanical properties of loess in Ili Valley and the regional distribution of loess engineering properties were obtained. The sand content of loess in the western region of the study area is larger, while the fine grain content of loess in the eastern region is larger, and the natural water content of loess in the eastern region is significantly higher than that in the western region. From northwest to southeast, the liquid limit and plasticity index of loess gradually increase, the collapsibility coefficient gradually increases, the permeability coefficient gradually decreases, and the shear strength and unconfined compressive strength of loess gradually increase. The c value of the soil gradually increases and the value gradually decreases.

( 2 ) The strength degradation law of undisturbed loess under freeze-thaw cycles and the difference of strength damage rate of Ili loess in different regions are revealed. With the increase of freeze-thaw cycles, the peak failure strength of soil samples decreases. The moisture content of loess in the eastern part of the study area is higher, which is more affected by the freeze-thaw cycle, and the strength damage rate is higher.

( 3 ) The deterioration law of permeability characteristics of undisturbed loess under the action of freeze-thaw cycles and the difference of the deterioration degree of permeability characteristics of Ili loess in different regions are revealed. With the increase of the number of freeze-thaw cycles, the self-weight deformation of the sample under the same gravity increases, the cumulative deformation increases, and the permeability coefficient increases. This is because the freeze-thaw action destroys the structure of the undisturbed soil, so that the internal pore ratio of the soil increases and the cracks expand. The water content of loess in the eastern part of the study area is higher, and the degree of deterioration of its permeability coefficient is greater under the same freeze-thaw action.

The research in this paper can further enrich the engineering property data of Ili loess and provide a useful reference for the study of the distribution law of regional loess.

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