摘要
针对地质因素影响TBM掘进效率的问题,以兰州市水源地建设工程输水隧洞双护盾TBM施工为背景,采用现场调查、数据统计的方法,分析了岩石单轴抗压强度、岩体完整性、岩石石英含量、地应力、地下水等对TBM施工的影响,并针对各种地质因素提出了TBM施工对策。结果表明:①当岩石单轴抗压强度R_(c)在50~80 MPa时,TBM施工速度最高,日进尺可达30 m以上;当R_(c)低于50 MPa时,施工速度随强度的降低而降低;当R_(c)大于80 MPa时,TBM施工速度随R_(c)的增加而降低。②当岩体完整性系数K_(v)在0.40~0.60时,施工速度最高;当K_(v)大于0.60时,施工速度随着K_(v)的增加而降低;当K_(v)小于0.4时,施工速度随着K_(v)的降低而降低。③岩石的石英含量越低,地应力水平越低,地下水越少,对TBM施工越为有利。研究结果可为类似工程的TBM地质适宜性评价及施工方法提供参考。
Taking the construction of Lanzhou Water Source Project as a background,which uses double shield TBM for tunneling,we analyze the effects of geological factors on TBM tunneling efficiency through on-site investigation and data statistics and propose countermeasures for each geological factor.The geological factors include uniaxial compressive strength of rock,rock mass integrity,quartz content of rock,ground stress,and groundwater.The results show that when the uniaxial compressive strength(R_(c))of rock is between 50~80 MPa,the TBM advancing rate(AR)reaches over 30 m in a day.When R_(c)is below 50 MPa,AR decreases with decreasing strength.When R_(c)is above 80 MPa,TBM tunneling speed decreases with increasing R_(c).When the rock mass integrity coefficient(K_(v))is between 0.40~0.60,AR reaches the highest.When K_(v)is greater than 0.60,AR decreases with increasing K_(v),and when K_(v)is less than 0.4,AR decreases with decreasing K_(v).The lower the quartz content of the rock,the lower the ground stress level,and the less groundwater,the more favorable it is for TBM tunneling.The research results can provide reference for TBM geological suitability evaluation and construction methods for similar projects.
作者
杨继华
魏建鹏
王志强
杨风威
齐三红
YANG Jihua;WEI Jianpeng;WANG Zhiqiang;YANG Fengwei;QI Sanhong(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)
出处
《人民长江》
北大核心
2024年第6期188-193,210,共7页
Yangtze River
基金
黄河勘测规划设计研究院有限公司自主研究开发项目(2020-ky04,2022-ky03,2023-ky14)。
关键词
输水隧洞
双护盾TBM
施工效率
地质因素
兰州市水源地建设工程
water conveyance tunnel
double shield TBM
construction efficiency
geological factor
Lanzhou Water Source Project
