地铁区间隧道桩洞法施工掌子面变形控制技术研究.docVIP

地铁区间隧道“桩洞法”施工掌子面变形控制技术研究 王国富 李强 王德超 秦世朋 济南轨道交通集团有限公司 X 关注成功！ 加关注后您将方便地在 我的关注中得到本文献的被引频次变化的通知！ 新浪微博 腾讯微博 人人网 开心网 豆瓣网 网易微博 摘????要： 依托济南市轨道交通R1线玉符河站-王府庄站区间隧道浅覆土长距离穿越城市主干道 (刘长山路) 工程, 提出了一种无碍交通、节能环保、产业化水平高、环境污染小的绿色快速装配式区间隧道施工新方法——桩洞法, 并详细研究了采用围岩自稳放坡+机械护盾支撑的掌子面变形控制方案.研究结果表明:不同的放坡角度工况下, 掌子面安全性能指数不同;随着放坡角度从40°增至45°、50°、60°, 最危险滑动面安全系数从1.649逐渐减至1.528、1.408、1.221;随着护盾前插长度的增加, 坡体安全系数、坡顶沉降和坡面水平位移变化不敏感.当放坡角度为60°+护盾前插深度为1.0m时, 掌子面变形安全系数为1.19, 确保了掌子面开挖的安全可控;研究成果可为类似条件下掌子面稳定控制提供依据. 关键词： 桩洞法; 掌子面; 自稳放坡; 机械支撑; 安全性能; 作者简介：王国富 (1964—) , 男, 博士, 研究员.E-mail:sucllh@126.com 作者简介：李强 (1989—) , 男, 硕士, 助理工程师.E-mail:l163.com 作者简介：王德超 (1984—) , 男, 博士, 工程师.E-mail:dechao20@126.com 收稿日期：2016-05-14 基金：济南市博士后创新项目 Research of Tunnel Face Deformation Control Technology in The Construction Progress of Pile-hole Method WANG Guofu LI Qiang WANG Dechao QIN Shipeng Jinan Railway Group Ltd.; Abstract： In the context of tunneling under shallow covering through urban main road ( Liuchangshan road) between Yufuhe station-Wangfuzhuang station of Jinan rail transit line R1 engineering, in this paper, a new green tunneling method-Pile-hole Method is put forward, which has advantages in traffic-free, energy saving and environmental protection, high level of modernization and less environmental pollution; A control plan of tunnel face deformation is introduced in detail, in which the step-slope excavation of surrounding rocks and mechanical shield are employed. The research results show that: Safety performance index of tunnel face varies with different slope angles; As slope angle increases from 40° to 45°, 50° and 60°, the safety index of the most critical slip surface is gradually reduced from 1. 649 to 1. 528, 1. 408 and 1. 221 accordingly;With the increase of the length of shield fork, there is no obvious changes in safety index of slope, settlement of slope top and horizontal displacement of slope surface. Introduce the relevant parameters under slope angle 60 ( safety index = 1. 22