文献类型：期刊文献

中文题名：中国西北地区生态型土质覆盖层厚度设计简化方法

英文题名：Simplified method for thickness design of ecological soil covers in northwest China

作者：李光耀 詹良通 焦卫国 冯嵩 陈云敏

第一作者：李光耀

机构：[1]北京工业大学重庆研究院,重庆401151;[2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124;[3]浙江大学软弱土与环境土工教育部重点实验室,杭州310058;[4]贵州理工学院土木工程学院,贵阳550003;[5]福州大学土木工程学院,福州350108

第一机构：北京工业大学重庆研究院,重庆401151

年份：2026

卷号：48

期号：1

起止页码：24-35

中文期刊名：土木与环境工程学报(中英文)

外文期刊名：Journal of Civil and Environmental Engineering

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金(42107186);重庆市自然科学基金(CSTB2023NSCQ-MSX0279)。

语种：中文

中文关键词：垃圾填埋场;生态型土质覆盖层;厚度设计;西北地区;季风气候

外文关键词：landfill;ecological soil covers;thickness design;northwest China;monsoon climate

摘要：中国现行规范借鉴北美非湿润地区生态型土质覆盖层厚度设计方法,采用6个经验公式对西北地区生态型土质覆盖层的厚度进行设计,但该方法涉及的参数较多、计算过程繁琐,最重要的是忽略了中国西北地区季风气候与北美非湿润地区湿冷气候对覆盖层厚度的不同要求。为了解决该问题,基于中国西北地区典型的雨-热-植生同期、植被非生长期降水量不超过全年总降水量20%的气候特征,并考虑黄土、粉土田间持水量与植被枯萎点之比K≥1.44的持水特点,提出适用于中国西北地区填埋场生态型土质覆盖层的厚度设计简化方法。利用Vadose/W数值程序分析了采用简化方法设计的单一黄土覆盖层和黄土-碎石毛细阻滞型覆盖层在最大降水量年的水力响应规律。结果表明:毛细阻滞效应阻碍了水分由黄土层向碎石层的大量运移,致使毛细阻滞型覆盖层的防渗表现优于单一型覆盖层;两种覆盖层的防渗表现均随黄土K值的增加而提高,当K≥1.35时,两种覆盖层均能满足当地的防渗要求,从而验证了所提简化方法的可靠性。
Currently,the thickness design method for ecological soil covers used in northwest China is based on the practice of non-humid regions in north America,which is complicated,involves various parameters,and fails to consider the different meteorological conditions between northwest China and north America.To solve this issue,on the basis of the monsoon climate of northwest China,the feature that the precipitation during the non-growing period of vegetation should not exceed 20%of the total annual precipitation,as well as the water retention characteristics of ideal cover soils that the ratio of the field capacity to the wilting point K≥1.44,the thickness design method for ecological soil covers used in northwest China is simplified.The numerical program Vadose/W is utilized to analyze the hydraulic responses of the loess monolithic cover and the loess-gravel capillary barrier cover designed with the proposed simplified method in the year of maximum precipitation.The results indicate that the capillary barrier effect significantly prevents the migration of water from the loess layer to the gravel layer,resulting in the capillary barrier cover having better anti-seepage performance than the monolithic cover.The anti-seepage performance of the two covers decreases with the decrease in the ratio of the field capacity to the wilting point of the loess(i.e.,K).When K≥1.35,the two covers can meet the local antiseepage requirements,thus preliminarily verifying the reliability of the proposed simplified method.