黄土筑坝填方工程地质问题及处理措施分析  

Analysis of Engineering Geological Problems and Treatment Measures of the Loess Dam Filling Project

作　　者：李征征[1] 高晓雯 王璋 李同录[3,4] LI Zhengzheng;GAO Xiaowen;WANG Zhang;LI Tonglu(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;China DK Comprehensive Investigate and Design Research Institute Co.,Ltd.,Xi'an 710054,China;Chang'an University,Xi'an 710054,China;MOE Scientific Observation and Research Station for Water Circulation and Geology of the Loess Plateau,Zhengning 745300,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]信电综合勘察设计研究院有限公司,西安710054 [3]长安大学,西安710054 [4]黄土高原水循环与地质环境教育部野外科学观测研究站,甘肃正宁745300

出　　处：《西北水电》2024年第1期27-32,39,共7页Northwest Hydropower

基　　金：国家自然科学基金(41790442)。

摘　　要：针对黄土地区的填方工程地质问题,以陕西铜川老虎沟填方工程为依托,通过地质调查与测绘、地质勘探、原位测试及室内试验等勘察手段,对工程存在的工程地质问题进行了分析研究。结果表明:老虎沟填方工程存在不良地质作用、不稳定高边坡、地下水疏排及填方地基变形等工程地质问题,应对挖方区高边坡进行1∶0.5~1∶0.75的放坡,反压坡脚,并预留平台及马道;对填方区土料进行强夯、碾压,消除其湿陷性,建议设计最大干密度值为1.73 g/cm^(3),最优含水率值为17.3%,压实系数为0.95~0.97;挡土坝坝基建议挖除不良土层,挡土坝坝坡采取加筋土筑坡,坡度宜为45°,坡面需做好防冲刷防护措施;排水沟底宜选用粘性较小的黄土回填,地表采用粘性较大的红粘土回填,并在地表设置完善的排水系统;工后应结合土水监测方案,实时监测填方区内土水变化。该研究成果可为黄土地区类似填方工程建设提供参考。In view of the geological problems of filling projects in loess areas,based on the Laohugou filling project in Tongchuan,Shaanxi,through geological survey and mapping,geological exploration,in-situ testing and indoor testing,analysis and study on the engineering geological problems existing in the project are carried out.The results show that the Laohugou filling project has engineering geological problems such as adverse geological effects,unstable high slopes,groundwater drainage,and fill foundation deformation.The high slopes in the excavation area should be treated with 1∶0.5~1∶0.75 slope,back pressure slope foot,and reserve platforms and berms;compact and roll the soil materials in the fill area to eliminate their collapsibility.It is recommended that the maximum dry density value in the design is 1.73 g/cm^(3),and the optimal moisture content is 17.3%,and the compaction coefficient is 0.95~0.97.It is recommended to excavate the undesirable soil layer at the foundation of the retaining dam,and use reinforced soil to build the slope of the retaining dam.The slope gradient should be 45°,and the slope needs to be protected against erosion.The bottom of the drainage ditch should be backfilled with less viscous loess,and the surface should be backfilled with more viscous red clay,and a complete drainage system should be provided on the surface.After the construction,combined with the soil and water monitoring plan,the soil and water variation in the fill area shall be monitored in real time.The study results can provide reference for the construction of similar filling projects in loess areas.

关 键 词：工程地质问题 黄土 填方 处理措施 监测措施 

分 类 号：TU476[建筑科学—结构工程]