Study on adverse effects of groundwater level rising induced by land creation engineering in hilly and gully area of the Loess Plateau

作     者：DUAN Xu DONG Qi YE Wan-jun ZHOU Jia-lin OH Erwin 

作者机构：School of Architectural and Civil EngineeringXi'an University of Science and TechnologyXi'anShaanxi 710054China Shaanxi Science&Technology Holding Group Co.Ltd.Xi'anShaanxi 710054China State Key Laboratoiij for Strength and Vibration of Mechanical StructuresXi'an Jiaotong UniversityXi'an 710049China School of EngineeringGriffith UniversityGold Coast 7222Australia 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2019年第16卷第12期

页      面：2739-2753页

核心收录：

学科分类：081803[工学-地质工程] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0303[法学-社会学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：financial support from National Natural Science Foundation of China (Project No. 41902299 41672305) the Key Science and Technology Program of Shaanxi Province (Project No. 2017ZDXM-SF-078, 2017ZDXM-SF-082) National Key Research and Development Program of China (2018YFC1504700) Shaanxi new-star plan of science and technology (Project No. 2018KJXX020) 

主　　题：Water immersion test Land creation engineering Loess plateau Groundwater Subsidence 

摘      要：Land creation projects have been implemented in China to expand urban space in mountainous areas.In addition to the predictable settlement brought about by filling construction,varying degrees of land subsidence and engineering failures have a demonstrated relationship to groundwater level fluctuation induced by land creation engineering.In this work,we adopted a typical large-scale land creation project,Yan’an New City in Shaanxi province,West China,as our study area.Prior to conducting the main experiment,preliminary field investigation and groundwater level monitoring were conducted to determine the groundwater fluctuation trend induced by land creation engineering.Although a blind drainage system was implemented,the depth aspect of groundwater level changes after large-scale land creation still needed to be addressed.To study the degree of impact and the settlement mechanism induced by the rising groundwater level,we conducted a Water Immersion Test(WIT)in a typical land creation site for 107 days.The rising groundwater level was simulated by injecting water from the bottom of the filling foundation.During the WIT,the soil water content,surface subsidence,and internal settlement of soil at different depths were obtained.Surface subsidence development could be categorized into four stages during the water level increase.The second stage,which is defined as the point when the groundwater level rises to 10 m,marked the critical point in the process.Furthermore,it was ascertained that the local settlement in regions that were originally composed of steep slopes is larger than that in originally flat areas.In addition,ground cracks and sinkholes in the study area were inspected;and it was determined that they would become new channels that would accelerate water infiltration and exacerbate the settlement.Based on the results from our field investigation and testing,several suggestions are proposed for land creation projects to mitigate issues associated with construction-induced groundwater level rising.