盾构掘进期隧洞穿越竖井段对周围土体渗流场的影响研究  

Influence of Tunnel Crossing the Shaft Section on the Seepage Field of Surrounding Soil during Shield Tunneling Period

作　　者：岳潇 王旭峰[1] 刘地福 甘磊[2] 沈振中[2] YUE Xiao;WANG Xufeng;LIU Difu;GAN Lei;SHEN Zhenzhong(Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Ji nan 250013,Shandong,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,Jiangsu,China)

机构地区：[1]山东电力工程咨询院有限公司,山东济南250013 [2]河海大学水利水电学院,江苏南京210024

出　　处：《水力发电》2024年第9期30-35,共6页Water Power

基　　金：山东电力工程咨询院有限公司科技项目(37-K2023-090)。

摘　　要：为研究隧洞盾构掘进期间穿越竖井对周围土体渗流场的影响,以河南省穿沁隧洞为工程依托,建立了盾构掘进期竖井段周围土体三维渗流有限元计算模型,对比分析穿越未灌浆填实和已灌浆填实竖井段前后周围土体渗流场分布及其演变规律。结果表明:穿越竖井后相较于未穿越竖井前的竖井周围土体最大渗透坡降、单宽渗透流量分别增加了6.00倍和4.29倍,浸润面逐渐抬高,等势线更为密集;穿越已灌浆填实竖井后土体最大渗透坡降、单宽渗透流量明显降低。隧道掘进期间穿越竖井会对周围土体的渗流场产生影响,降低土体的稳定性,容易引发渗透破坏。同时,灌浆填实竖井能有效降低隧洞开挖对周围土体的影响,提高土体的稳定性。In order to study the influence of tunnel crossing the shaft on the seepage field of surrounding soil during shield tunneling,the Chuanqin Tunnel in Henan Province is taken as an engineering basis,and a three-dimensional seepage finite element computational model of the soil around the shaft section during shield tunneling is established.The distributions and its evolution pattern of the seepage field of surrounding soil before and after crossing the ungrouted and grouted filled shaft sections are compared and analyzed.The results show that,(a)the maximum seepage gradient and unit discharge of the soil around the shaft increased by 6.00 and 4.29 times respectively compared with that before crossing the shaft,and the seepage surface of the soil around the shaft is gradually elevated and the isotropic line became more intensive;and(b)the maximum seepage gradient and unit discharge of the soil around the shaft decreased significantly after crossing the grouted and filled shaft.Crossing the shaft during tunneling would affect the seepage field of surrounding soil,reduce the stability of soil,and easily lead to seepage damage.Meanwhile,grouting to fill the shaft can effectively reduce the impact of tunnel excavation on surrounding soil and improve the stability of soil.

关 键 词：竖井 周围土体 三维渗流分析 渗流场 渗透坡降 单宽渗透流量 

分 类 号：TV223.6[水利工程—水工结构工程]