摘要
盾构法作为地铁隧道施工的一种主要施工方法已在我国得到广泛的应用,由施工引起的地层移动和地表沉降是盾构隧道设计和施工中备受关注的问题。文章以深圳地铁5号线洪浪—兴东盾构区间下穿广深高速公路立交桥隧道施工为工程依托,通过数值模拟和现场监测,对影响地表沉降的掘进参数进行了模拟分析。计算结果表明,地表下沉与盾构掘进参数密切相关,适当加大注浆压力能有效控制地表沉降;同时,土舱压力与土体原始侧向压力接近时地表沉降量最少。实测地表沉降与掘进参数的关系表明,当注浆量一定时,地面沉降随土舱压力的增加而减小;地表沉降随着注浆量及注浆压力的增大而减小。
hield tunneling has been widely adopted in China.Strata movement and ground settlements induced by construction are main issues to be addressed.Considering the shield tunnel under-passing Guangshen highway flyover of Shenzhen subway Line 5,numerical simulation and field monitoring were used to analyze the influence of parameters of shield driving on ground settlemens.Numerical modeling results showed that increasing grouting pressure can effectively reduce ground settlements and the minimum ground settlements will be achieved when the earth pressure in the earth cabin was close to the lateral earth pressure.The relationship of measured ground settlements and parameters of shield driving indicated that ground settlements decreased with the increase of earth pressure in the earth cabin,with the increase of grout amount and pressure.
出处
《现代隧道技术》
EI
北大核心
2010年第5期48-53,共6页
Modern Tunnelling Technology
关键词
盾构隧道
地表沉降
掘进参数
数值模拟
Shield tunnel
Ground settlement
Parameters of shield driving
Numerical simulation
