南方湿热地区煤矸石-红黏土路基的强度与变形特性

doi:10.13229/j.cnki.jdxbgxb.20240195

摘要/Abstract

摘要：

针对南方湿热地区煤矸石-红黏土路基稳定及耐久性服役问题，本文通过击实试验、UCS试验、CBR试验及三轴试验等系列室内试验对煤矸石-红黏土混合料的强度与变形特性进行研究。结果表明：混合料的最大干密度随黏土掺入量的增加呈先增大后减小的趋势，最佳含水率随黏土掺入量的增加而逐渐增大；UCS值和CBR值随黏土掺入量的增加呈先增大后减小的趋势，且在黏土掺入量为40%时达到峰值；永久变形值随黏土掺入量的增加先减小后增大，随偏应力、加载次数、干湿循环次数的增加而增大，随围压的增加而减小；在此基础上，建立综合考虑物理状态、应力状态、加载状态及环境状态影响的永久变形预估模型，并进行验证。本文研究成果可为煤矸石-红黏土路基填筑施工提供有效参考。

关键词: 道路工程, 煤矸石-红黏土, 干湿循环, 耐久性服役, 预估模型

Abstract:

In order to address the stability and durability issues of coal gangue-red clay subgrade in hot and humid areas of southern China， this study investigates the strength and deformation characteristics of a coal gangue-red clay mixture through a series of laboratory tests， including compaction， UCS， CBR， and triaxial tests. The results demonstrate that the maximum dry density initially increases and then decreases with increase of clay content， while the optimum moisture content gradually increases with higher clay content. The UCS value and CBR value exhibit an initial increase followed by a decrease as the clay content rises until reaching their peak at 40%. Permanent deformation initially decreases but then increases with increasing clay content. It also increases with higher deviator stress， loading cycles， and wet-dry cycles but decreases with increased confining pressure. Based on these findings， a comprehensive prediction model for permanent deformation is established considering physical state， stress state， loading state as well as environmental conditions. These research findings can provide valuable references for construction practices in filling coal gangue-red clay subgrade.

Key words: road engineering, coal gangue-red clay, dry and wet cycle, durable service, prediction model

中图分类号:

U414

韦秉旭,曾警,陈楚方. 南方湿热地区煤矸石-红黏土路基的强度与变形特性[J]. 吉林大学学报(工学版), 2025, 55(11): 3632-3640.

Bing-xu WEI,Jing ZENG,Chu-fang CHEN. Strength and deformation characteristics of gangue-red clay subgrade in hot and humid areas in south China[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(11): 3632-3640.

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土样名称	最大干密度/（g·cm³）	最佳含水率/%	液限/%	塑限/%	塑性指数	比重	粒径分布/%
土样名称	最大干密度/（g·cm³）	最佳含水率/%	液限/%	塑限/%	塑性指数	比重	＜0.002	0.002~0.075	0.075~2
红黏土	1.86	18.2	53.8	26.1	27.7	2.71	79.4	13.2	7.4

参考变量	试验数值
黏土掺入量/%	0、20、40、60、80
围压/kPa	20、40、60
偏应力/kPa	20、40、60
加载次数	10 000
干湿循环次数	0、1、2、3、4、5
加载时间/s	0.2
间歇时间/s	0.8