卵砾石下伏中等膨胀岩地层土压平衡盾构姿态演化规律.pdfVIP

Journal of Engineering Geology 工程地质学报 1004- 9665/ 2016/ 24 ( 5 ) - 0798-08 DOI ：10.13544/ki.jeg.2016.05.009 卵砾石下伏中等膨胀岩地层土压平衡盾构姿态演化规律* 张 亚 男 ① ② 季 昌 ② 周 顺 华 ② 张 世 荣 ③ (①中铁二院华东勘察设计有限责任公司杭州310004) (②同济大学道路与交通工程教育部重点实验室上海201804) (③南宁轨道交通集团有限责任公司南宁530021) 摘 要 南 宁 地 铁 1 号线区间盾构隧道局部穿过卵砾石下伏中等膨胀岩地层，为得到盾构在该地层中掘进的姿态演化过程, 通过现场实测数据分析了下部膨胀岩地层遇水膨胀后对盾构姿态变化的影响。研究表明：下部泥岩遇水膨胀后与同步浆液 混合物包裹于盾构机下方, 导致姿态控制困难；掘进过程中增大上部推力可使盾头姿态下降，但盾构中后部姿态会上升，停机 拼装管片时遇水膨胀的泥岩会导致盾头姿态上升；掘进过程中应保持合理的上下推力差值, 并配合采取其他控制技术。 关键词盾构隧道中等膨胀岩盾构姿态现场监测 中图分类号:P642 文献标识码:A EVOLUTION LAWS OF EARTH PRESSURE BALANCE SHIELD ATTITUDE IN MEDIUM EXPANSIVE ROCK UNDERLYING GRAVEL-COBBLE LAYER ZHANG Yanan®® JI Chang® ZHOU Shunhua® ZHANG Shirong® ((X)China Railway Eryuan Engineering Group East China Survey and Design Co.,Ltd., Hangzhou 310004) ( (2)Xey Laboratory o f Road and Traffic Engineering o f the Ministry o f Education , Tongji University， Shanghai 201804) ( ③ Nanning Rail Transit Co. ，L td.， Nanning 33QQ21) Abstract The Na ing metro line 1 partly passes through the complex strata of gravel-cobble and medium expansive rock. In order to obtain the evolution process of shield attitude when tu eling in this complex strata, the influence of water-swelling expansive rock on shield attitude is analyzed by measured data. The result shows that the mixture of water-swelling mudstone and synchronous grout can adhere under the shield when encountering water, and makes it difficult to control the shield attitude. The attitude in head part of shield can be descend by enlarge shield thrust in upper region when tu eling. But the attitude in postmedian of the shield can ascend. The water­ swelling mudstone can raise the head part of shield when assembling shield segments. The thrust difference between upper and lower regions should be kept in