基于高压旋喷桩的长江堤防渗流监测与流场分析  

Seepage Monitoring and Flow Field Analysis of the Yangtze River Embankment Based on High-Pressure Jet Grouting Piles

作　　者：薛子龙 吴杰 万景红 XUE Zilong;WU Jie;WAN Jinghong(Nanjing Yangtze River Administration Office,Nanjing 210011,China;General Irrigation Canal Management Office of Jiangsu Province,Huai’an 223200,China)

机构地区：[1]南京市长江河道管理处,江苏南京210011 [2]江苏省灌溉总渠管理处,江苏淮安223200

出　　处：《水资源开发与管理》2025年第4期68-73,共6页Water Resources Development and Management

基　　金：南京市水务科技项目(202301)。

摘　　要：长江南京大河口段堤防在2020年汛期发生渗漏险情,汛期结束后采用高压旋喷桩进行了防渗处理,为开展渗流监测分析试验,在该堤段布置了1个渗流监测断面,并于断面内布置了3个钻孔与6个渗压测点,通过采集测点水压力数值和推算水位深度,比对不同位置测点的水压力大小,推断堤防内部浸润线范围与流线路径,为堤防安全隐患排查提供参考依据。结果表明,P5测点监测水压最小,P6测点监测水压最大,P3测点高程与该点浸润线高程接近;堤防迎水面水位上涨对P1、P2与P4测点水压影响显著,对P3、P5与P6测点水压影响较小;堤防内部设置高压旋喷桩后,能阻挡渗流直接从堤防迎水面到背水面的流动,增加了渗流路径长度,降低了渗流流速、流量以及浸润线高度,有效提高了堤防防渗能力。During the 2020 flood season,a seepage hazard occurred along the levee section of the Yangtze River at Dahoukou in Nanjing.After the flood season,high-pressure jet grouting was employed for seepage control.To facilitate seepage monitoring and analysis,one monitoring cross-section was established along this levee segment,with three boreholes and six piezometric measurement points arranged within the section.By collecting water pressure data from these points and estimating groundwater table depths,the water pressure differences at various locations were compared to infer the extent of the phreatic surface and the seepage flow paths inside the levee,thereby providing a reference for identifying potential safety hazards.The results indicate that the minimum water pressure was observed at monitoring point P5,while the maximum was recorded at P6.The elevation of P3 was close to the phreatic line elevation at that point.Rising water levels on the upstream side of the embankment significantly affected the water pressure at P1,P2,and P4,while having a lesser impact on P3,P5,and P6.The installation of high-pressure jet grouting piles inside the embankment effectively blocked direct seepage flow from the upstream to the downstream side,increased the seepage path length,reduced seepage velocity and flow rate,and lowered the phreatic line height,thereby significantly enhancing the embankment’s seepage resistance capacity.

关 键 词：高压旋喷桩 渗流 流场 浸润线 长江堤防 

分 类 号：TV139.14[水利工程—水力学及河流动力学]