首页|新型土工织物处治膨胀土水分迁移试验研究

新型土工织物处治膨胀土水分迁移试验研究

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膨胀土是一种亲水性较强的特殊土,遇水易发生胀缩变形,导致修建在膨胀土地区的路基常产生路面开裂、沉降、翻浆等病害.新型土工织物是一种具有排水与加筋功能的新型土工材料,除像传统排水结构一样能排"明水"外,其毛细织物沟槽产生的毛细力还能排毛细水,在非饱和环境下排水效率高.为研究新型土工织物对膨胀土水分迁移的影响规律,通过在膨胀土中设置一层土工织物,开展毛细水上升、降雨入渗条件下素土(素土样)、新型土工织物排水(排水样)及不排水(阻隔样)3种工况的一维土柱对比试验,探索新型土工织物对膨胀土的含水率(体积、质量)、膨胀率及不排水强度的影响规律.研究结果表明:膨胀土与新型土工织物形成的阻隔系统使得更多的水分集聚在土工织物周围,产生了类似"锅盖"的效应;在膨胀土中铺设新型土工织物,能延缓水分迁移速率和抑制胀缩变形,膨胀土的不排水抗剪强度发生了显著变化;阻隔样中新型土工织物将水分吸附、阻滞在其周围不能排出,易造成病害,排水样中试样内外湿度差产生的吸力差将"抽吸"到新型土工织物毛细沟槽中的水分横向导出;为充分发挥新型土工织物在非饱和环境下的排水效率,需将其延伸至土样外.研究成果可为膨胀土路基设计、施工及病害处治提供参考.
Influence of a new geotextiles on the migration of water content in expansive soil pavements:a experimental study
Expansive soil is a special type of highly hydrophilic soils that is prone to expansion and contraction deformation when encountering water,resulting in cracking,settlement,pumping,and other problems for pavements constructed in expansive soil areas.The new geotextile is a new type of geomaterials with drainage and reinforcement functionalities that can drain gravitational water(similar to traditional drainage structures);in addition,capillary water can also be wicked by the capillary force generated by the capillary fabric grooves of the wicking geotextile.In addition,this material has a high level of dewatering performance in unsaturated environments.To investigate the influence of a new geotextiles on the moisture content distribution,expansive rate and undrained strength of the expansive soil,one-dimensional soil column comparison tests between only soil(soil sample),drained and undrained specimens under capillary water rise and rainfall infiltration were carried out by placing a new geotextile layer in expansive soil.The results show that more water was accumulated by capillary barrier system formed by the expansive soil-geotextile than that without geotextile,resulting in a"pot cover"effect.The presence of the geotextile slowed down the rate of water migration and limited the swelling deformation,and the undrained shear strength of soil also changed significantly.The water that was absorbed and blocked around the geotextile cannot be drained,which can easily cause engineering problems.The capillary forces generated by the capillary grooves of the new geotextiles pumped more water into the sample and then the accumulated water was exported horizontally by the suction difference between the humidity inside and outside of the new geotextile.The new geotextiles need to be extended beyond the soil sample to fully exploit their drainage performance under unsaturated conditions.The research results can provide certain guidance for the management of engineering problems in expansive soil pavements.

new geotextilescapillary fabricsexpansive soilsmoisture contentexpansive rateundrained shear strength

郭一鹏、聂如松、张雄、张永杰、陈洁金、邹全

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长沙理工大学 土木工程学院,湖南 长沙 410114

高速铁路建造技术国家工程研究中心,湖南 长沙 410075

中南大学 土木工程学院,湖南 长沙 410075

密苏里科技大学,密苏里 罗拉 65409

益阳市赫山区沧水铺镇镇政府,湖南 益阳 413064

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新型土工织物 毛细织物 膨胀土 含水率 膨胀率 不排水抗剪强度

国家自然科学基金资助项目国家自然科学基金资助项目湖南省自然科学基金资助项目湖南省自然科学基金资助项目高速铁路建造技术国家工程实验室开放基金资助项目长沙理工大学重点学科创新项目

52008038521784162021JJ405792021JJ40572HSR20190516ZDXK08

2024

10.19713/j.cnki.43-1423/u.T20230451

铁道科学与工程学报
中南大学 中国铁道学会

铁道科学与工程学报

CSTPCD北大核心EI
影响因子：0.837
ISSN：1672-7029
年,卷(期)：2024.21(2)
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