盾构无障碍始发土舱压力计算模型研究  

Calculation Model of Earth Chamber Pressure during Non-Barrier Launching of EPB Shield

作　　者：刘军 南志领 金鑫 LIU Jun;NAN Zhiling;JIN Xin(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044;Beijing Urban Construction Group Co.,Ltd.,Beijing 100125;Shandong High-speed Real Estate Group Co.,Ltd.,Jinan 250098)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京城建投资发展股份有限公司,北京100125 [3]山东高速地产集团有限公司,济南250098

出　　处：《现代隧道技术》2019年第4期113-118,共6页Modern Tunnelling Technology

基　　金：北京市自然科学基金项目;北京市教育委员会科技计划重点项目(KZ20131001601);北京市属高等学校创新团队建设与教师职业发展计划项目(IDHT20130512)

摘　　要：常规的盾构始发需预先凿除钢筋混凝土围护结构,土舱压力无法及时建立,即便对洞口处土体进行了止水加固处理,仍无法彻底改变洞口处土体坍塌、涌水、涌砂等问题。文章基于洞口处采用玻璃纤维筋混凝土围护结构,建立了盾构无障碍始发土舱压力计算模型,提出了盾构无障碍始发土舱压力计算公式。通过在北京地铁16号线工程中的实际应用表明,所建立的计算模型能够反映土舱压力的建立过程,可实现土舱压力的快速建立;此外始发掘进前外加泥土等材料的加入量对于建立土舱压力极为关键。Pressure in earth chamber can't be built up in time during conventional launching of EPB shield since it needs to manually remove the retaining structure of steel reinforced concrete in advance.Even though water stopping and reinforcement are carried out at the tunnel entrance,but the problems of soil mass collapse,water inflow and sand gushing can't be thoroughly solved.In view of this a calculation model of earth chamber pressure during nonbarrier launching of EPB shield was established by building retaining structure of fiber glass reinforced concrete at tunnel portal,and a formula to calculate earth chamber pressure during non-barrier launching of EPB shield was presented.The application of this calculation model to Beijing metro line 16 shows the calculation model can reflect the build-up process of earth chamber pressure,and the volume of added material like soil and so on before launching is a key factor related to build-up of earth chamber pressure.

关 键 词：地铁隧道 盾构无障碍始发 土舱压力 理论分析 计算模型 加泥量 

分 类 号：U231.3[交通运输工程—道路与铁道工程]