摘要
本文对莎车县泥石流防治工程区域2m范围内的表层土进行了系统性采样,并对其含盐量进行分析,对该区域盐渍土的分布特征、对防治工程的影响、盐渍土的成因及盐渍化影响因素进行深入探讨。研究发现,研究区主要是中、弱盐渍土,强盐渍土的分布区域很小,没有出现超盐渍土。在气象、地形、地下水、地层岩性等因素综合作用下,研究范围内土壤盐分之中各个离子的相对含量由于盐分含量的不断增加出现了规律性改变。平面上分布呈现自南向北逐渐增强的趋势,临近叶尔羌河方向,盐渍化程度越来越高。垂向上,盐渍土出现明显的分带性和表聚性,表层普遍积盐,全区范围内易溶盐总体上呈向下含盐量逐渐降低的趋势;土壤pH值变化随垂向深度增加而增大。研究区内工程病害为结构物裂缝,分为表面裂缝和深部变形裂缝两类,盐分对工程的侵入破坏导致防治工程表面裂缝的产生,盐渍土的盐胀和溶陷特性导致深部变形裂缝的产生。利用SPSS25对盐渍化的影响因素进行回归分析得到,研究区含盐量与矿化度、潜水埋深、高程空间分布吻合度较高,矿化度与研究区土壤含盐量空间相关性最高,且表现为直接影响。研究成果可为莎车县地质灾害防灾减灾、地区开发建设提供参考,并对其他类似地区盐渍土的研究提供借鉴。
This paper intends to systematically sample the topsoil within 2m of the debris flow prevention area in Shache County and analyze its saltness.The distribution characteristics of saline soils in the area,the impact on the prevention area,the causes of saline soils and the factors influencing salinization are discussed in depth.It is found that the study area is mainly medium and weakly saline soils,with very small areas of strong saline soils and no hyper saline soils.The relative content of each ion in the soil salinity in the study area changes regularly due to the increasing saltness,under a combination of meteorological,topographical,groundwater and formation lithology factors.The planimetric distribution showed a gradual increase from south to north,with increasing salinization towards the Yarkant River.Upwards,saline soils showed a clear zonation and superficial aggregation,with a general accumulation of salt in the surface layer and a general downward trend in the salinity of eutectic salts throughout the region.Soil pH changes enhance with increasing depth in the vertical direction.The engineering diseases in the study area are structural cracks,which are divided into two categories:surface cracks and deep deformation cracks.The salt intrusion damage to the project is the cause of surface cracks in the prevention and control works.The salt swelling and dissolution characteristics of saline soils lead to the production of deep deformation cracks.Regression analysis of the factors influencing salinity using SPSS25 yielded that the spatial distribution patterns of salinity and mineralization,groundwater depth and elevation in the study area coincided well.Mineralisation enjoys the highest spatial correlation with soil salinity in the study area and showed a direct effect.The results of the study can provide reference for the prevention and mitigation of geological hazards and regional development and construction in Shache County,which provide reference for the study of saline soils in other similar areas.
作者
张永亮
史光明
张紫昭
陈德斌
付晶
ZHANG Yongliang;SHI Guangming;ZHANG Zizhao;CHEN Debin;FU Jing(College of Geology and Mining Engineering,Xinjiang University,Urumqi 830049,China;Research Base of Xinjiang University,State Key Laboratory of Deep Rock Mechanics and Underground Engineering,Urumqi 830049,China;The Second Hydrological Engineering Geology Brigade of Xinjiang Geology and Mining Bureau,Changji 831100,China)
出处
《工程地质学报》
CSCD
北大核心
2023年第4期1438-1449,共12页
Journal of Engineering Geology
基金
国家自然科学基金项目(资助号:41967036)
新疆维吾尔自治区重点研发项目(资助号:2021B03004-3)
2023年国家级大创项目:新疆南疆地区盐渍土溶陷性及盐-冻胀性试验研究.
关键词
盐渍土
盐分
防治工程
空间分布
影响因素
Saline soils
Salinity
Prevention engineering
Spatial distribution
Influencing factors
作者简介
第一作者:张永亮(1999-),男,硕士生,主要从事地质灾害和地质环境研究工作.E-mail:1913241897@qq.com;通讯作者:史光明(1988-),男,硕士,副教授,硕士生导师,主要从事地质灾害评价及防治方面的科研和教学工作.E-mail:shiguangming@xju.edu.c。
