摘要
南干渠工程是南水北调配套工程,承担着向北京城市东部、南部地区供水的任务,是直接联系南水北调总干渠到郭公庄水厂、黄村水厂和亦庄水厂的输水管线,线路总长27.4km,采用浅埋暗挖和盾构法施工,浅埋暗挖段为双管,管内径为3.4m,盾构段为单管,管内径为4.7m.在该工程招标补勘时,发现大回填垃圾坑,导致原有的设计方案无法实施,引起业主高度重视,并要求我院在施工之前查明全线的垃圾坑分布情况,确保施工安全.因此时离原计划开工日期不足三个月,若采用常规勘探手段,无法在这么短工期内查明回填垃圾坑的分布情况.为了按时保质保量完成勘察任务,我经过反复研究,最终决定采用以物探为主,勘探为辅的手段进行勘察.因工区周边影响物探精度的干扰源较多,经过现场反复对比研究,选用工作效率高、抗干扰能力强的高密度地震映象技术,通过对全线的普查,为地质人员准确圈定埋深大于5m回填坑11处,其中有2处回填坑的坑底埋深大于设计洞顶埋深,为设计方案更改提供科学依据.通过此次应用研究,我们总结出高密度地震映象不仅能够准确反映和区分地下不良地质体的形状,若再结合少量勘探孔资料,研究其与波形的振幅、频率等对应关系,还能对不良地质体作出定量分析,改变了以往该技术只能定性分析的不足,同时也为物探在城市建设中的应用提供参考.
South Main Canal Project（SMCP）is part of the South-North Water Diversion Project. It＇s job is to convey water to the east and north part of Beijing. It connects to the water pipelines which combine the main canal, the Guogongzhuang water plant, the Huangcun water plant and the Yizhuang water plant. The total line, using the subsurface excavation and tunnel shield, is 27. 4 km. We find same big backfill garbage pits during the reconnaissance, which are harmful to the original project. Our job is to find out the locations of the backfill garbage pits to ensure the construction safety. Due to lack of time and there are many interference sources surrounded, we decide to use Seismic imaging, a geophysical method to solve the problem. Based on the survey, we accurately outline 11 backfill garbage pits which are more than 5 meters in depth, 2 of these pits have clashed with the original design. Based on this, we could improve the plan scientifically. We find the Seismic imaging method can accurately distinguish and quantitative analysis for the adverse geology structures from this study. This covers the shortage of former methods and provides a reference for the Geophysical urban construction.
出处
《地球物理学进展》
CSCD
北大核心
2013年第5期2773-2780,共8页
Progress in Geophysics
关键词
高密度地震映象技术
南干渠工程
勘察
同相轴
正常地层
回填垃圾坑
seismic imaging, South Main Canal Project, geological survey, event, normal formation, backfillgarbage pit
