水土保持学报2025，Vol.39Issue(3)：147-153,7.DOI:10.13870/j.cnki.stbcxb.2025.03.001
海涂围垦区土壤孔隙特征与强度特性原位试验
In Situ Experimental Study on the Characteristics of Soil Pore and Strength in Coastal Reclamation Areas
摘要
Abstract
[Objective]To explore the relationship between the characteristics of soil strength and soil pore in the tidal flat reclamation areas under in-situ conditions.[Methods]Taking the soils in different reclamation areas of the coastal tidal flats in Jiangsu Province as the research object,the relationships among soil structure,in-situ soil shear strength(Cu)and sensitivity(St)were analyzed through in-situ vane shear tests and CT scanning technology.[Results]The St values in Binhai(BH)and Rudong(RD)were between 1.3 and 5.4,falling within the range from medium sensitivity(2-4)to sensitivity(4-8).However,for the disturbed soil in these two places,the St values showed no significant changes under different depths and reclamation years.In contrast,the St values of the disturbed soil in Dongtai(DT)varied significantly.The St values in each soil layer were higher than those at BH and RD.Among them,the St value at DT1 was the highest,and the St value at BH3 was the lowest.The analysis of soil mechanical properties indicates that there was a positive correlation between soil bulk density,clay particle content and Cu(r=0.657 and 0.782,p<0.05),while there was a negative correlation between soil porosity and Cu(r=-0.529 and-0.414,p<0.05).In addition,there was a significant negative correlation between soil sensitivity(St)and fractal dimension(FD),pore number(NOP)(r=-0.611,p<0.05).In the regression analysis,it is further revealed that there was a negative correlation between Cu and soil porosity,and St and NOP followed a logarithmic decreasing relationship.In the principal component analysis,the first principal component(PC1)was mainly dominated by the pore number,fractal dimension and clay content.PC2 was mainly composed of Cu and bulk density,and PC3 was jointly driven by soil porosity and soil shear strength.These indicators jointly highlight the importance of soil pore structure and physical properties in the evaluation of shear strength.[Conclusion]This study provides a scientific basis for an in-depth understanding of soil characteristics in coastal reclamation areas and offers important references for research on the stability of engineering construction,slope stability,evaluation of soil erosion resistance,and analysis of plant growth conditions in coastal areas,which is helpful to promote sustainable development of agriculture in coastal areas.关键词
土壤抗剪强度/孔隙特征/CT扫描/主成分分析Key words
soil shear strength/pore characteristics/CT scanning/principal component analysis分类
农业科技引用本文复制引用
姜子煜,王洪德,孙枭沁,潘永春,唐胜强,佘冬立..海涂围垦区土壤孔隙特征与强度特性原位试验[J].水土保持学报,2025,39(3):147-153,7.基金项目
国家自然科学基金项目(42307398) （42307398）
