潮白河右堤典型渗漏段探测分析

Detection and analysis of typical leakage section of right embankment of Chaobai River

综合采用高密度电阻率法、探地雷达法和面波法等3种物探方法,在2021年潮白河生态补水期(含补水前期)对潮白河右堤梭草村及其上下游段(即15+100—15+440、16+560—16+800(梭草村段)和17+000—17+300段)堤防进行了探测分析。结果表明,2021年春季生态补水初期探测堤段富含水区主要位于堤身以下,生态补水中期堤基富含水区扩大,部分堤段堤身新增富含水区;探测堤段堤身均存在多处不密实区,生态补水期间变化不显著;探测堤段堤基亦存在多处不密实区,随着生态补水的持续,不密实区数量增加、范围明显扩大,表明堤基卵石层内细颗粒有所流失,15+100—15+440、16+560—16+800(梭草村段)及17+000—17+300段堤下7~15 m存在整体渗漏通道(局部除外)。三种无损物探方法的联合使用可以较好地应用于堤防工程缺陷及渗漏的探测分析。

Three geophysical methods,including high-density resistivity method,ground penetrating radar method and surface wave method,are comprehensively used to detect and analyze the leakage sections of the right embankments around Suocao Village(i.e.,15+100-15+440,16+560-16+800 and 17+000-17+300 section)of the Chaobai River during the ecological water supplement period in 2021.The detection results showed that in the early period of ecological water supplement in 2021,the water-rich areas of the detected embankment section are mainly located below the embankment body.However,in the middle period of ecological water supplement,the water-rich areas under the embankment body expanded,and some embankment sections become new water-rich areas.There are many uncompacted areas in the embankment body of the detection sections,and there was no significant change during water replenishment.There were also many non-compacted areas in the foundation of the detection embankment.With the continuous ecological water supply,the number of non-compacted areas increased and the scope expanded significantly.It indicated that the fine particles in the pebble layer of the embankment foundation are errosion.There are overall leakage channels at 7-15 m below the embankment in the three detection sections.Comprehensive analysis shows that the water in the three embankments mainly seeps out along the pebble layer under the embankment.