植物根系-土工垫联合加筋对土体强度影响试验研究  

Experimental study on the influence of plant root-geomat joint reinforcementon soil strength

作　　者：马驰骋 谭慧明[1,2] 胡昕[3] MA Chicheng;TAN Huiming;HU Xin(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Coastal Disaster and Protection,Ministry of Education,Hohai University,Nanjing 210098,China;Northwest Electric Power Design Institute Co.Ltd.,Xi′an 710032,China)

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098 [2]河海大学海岸灾害及防护教育部重点实验室,南京210098 [3]西北电力设计院有限公司,西安710032

出　　处：《水道港口》2023年第5期811-818,共8页Journal of Waterway and Harbor

基　　金：国家自然科学基金资助项目(52078187);西北电力设计院有限公司技术创新项目(KC-2022-001)。

摘　　要：土工垫加筋草皮通过根系与土工垫联合加筋作用显著提高了土体强度,具有减小浅层滑坡和表面侵蚀的作用。开展重塑土试样直剪试验,通过测试加筋土体在不同垂直压载下的抗剪强度,分析植物根系含量与形态、土工垫、含水率等对联合加筋作用的影响规律,进而开展了加筋土强度组成量化分析。研究表明:经土工垫加筋的土体,可以显著减少土体由于含水率等变化时引起的强度变化;含水率对联合加筋土抗剪强度的影响可以用一种指数函数关系进行拟合;同时进行重塑样抗剪强度量化研究,建立基于土体本身粘聚力、基质吸力、根系与土工垫加筋效应的重塑土抗剪强度计算公式,所得的计算值与实测值吻合程度较好,提供一种可行的强度量化思路。The strength of soil mass is significantly improved by the combined reinforcement effect of the geomat and reinforced turf through their root systems,which has the effect of reducing shallow landslides and surface erosion.Direct shear tests were performed on the remolded soil samples.A quantitative analysis of the strength composition of the reinforced soil was carried out by examining the shear strength of the reinforced soil under different vertical loads and analyzing the influence of factors such as vegetation root content and morphology,geomat,water content,and others on the combined reinforcement effect.The research shows that the strength changes of the soil mass reinforced by the geotechnical pad can be significantly reduced caused by variations in water content and other factors.The effect of water content on the shear strength of the joint-reinforced soil can be fitted by an exponential function relationship.The quantitative study on the shear strength of remolded samples is concurrently conducted.A calculation formula of the shear strength of the remolded soil based on the soil's cohesion,matrix suction,and the reinforcement effect of roots and geomat is established.The good agreement between the calculated and measured values suggests a feasible approach for quantifying intensity.

关 键 词：加筋土 剪切试验 联合加筋 强度量化 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] TU447[交通运输工程—船舶与海洋工程]