基于综合探测手段的地铁隧道岩溶注浆处置研究

Study on Karst Grouting Treatment of Subway Tunnel Based on Comprehensive Exploration Method

东南沿海地区岩溶分布广泛,给各类地下工程施工造成极大的安全隐患和经济损失。处理该类不良地质条件的关键在于岩溶的精准刻画和注浆处置。本文结合高密度电阻率法、地震CT法以及地震面波法对绍兴地铁1号线阳和路站到鉴湖镇站部分区域开展测试,分析高密度电阻率法、地震CT法在岩溶勘探上的区别和联系;同时在精准刻画岩溶形态和空间分布的基础上开展注浆加固,结合钻孔取芯试样的力学试验和地震面波法验证岩溶的注浆加固效果。结果显示,高密度电阻率法和地震CT法的反演结果均与钻孔勘探的结果吻合较好,两者结合可以较好地刻画岩溶形态;地震面波法有效地检测到注浆和未注浆的岩溶,且注浆后的岩土体抗压强度均超过设计值0.4 MPa的强度要求。综合多种岩溶探测手段在绍兴地铁1号线中的研究成果为岩溶区地铁隧道的建造和维护提供了可靠的依据。

Karst is widely distributed in southeast coastal areas of China,which causes great security risks and economic losses to all kinds of underground engineering construction.The key point to deal with such unfavorable geological conditions is the accurate description of karst and grouting treatment.In the present work,the high density resistivity method,seismic CT method and seismic surface wave method were used to test the certain areas from Jianhuzhen station to Yanghelu station of Shaoxing Metro Line 1.In addition,the difference and relationship between high-density resistivity method and seismic CT method in karst cave exploration were analyzed.Grouting reinforcement was carried out on the basis of accurate description of karst morphology and spatial distribution,and the grouting reinforcement effect of karst was verified by combining the mechanical test of borehole coring samples and seismic surface wave method.The results show that the inversion of high density resistivity method and seismic CT method are in good agreement with the borehole exploration,and the combination of the two methods can better depict the karst morphology.The seismic surface wave method can effectively detect the karsts with grouting and without grouting,and the compressive strength of the rock and soil mass after grouting exceeds the strength requirement of the design value of 0.4 MPa.The research results of multiple karst exploration methods in Shaoxing Metro Line 1 provide a reliable basis for the excavation and maintenance of subway tunnels in karst areas.