卵砾石下伏中等膨胀岩地层土压平衡盾构姿态演化规律  

EVOLUTION LAWS OF EARTH PRESSURE BALANCE SHIELD ATTITUDE IN MEDIUM EXPANSIVE ROCK UNDERLYING GRAVEL-COBBLE LAYER

作　　者：张亚男[1,2] 季昌[2] 周顺华[2] 张世荣 

机构地区：[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

出　　处：《工程地质学报》2016年第5期798-805,共8页Journal of Engineering Geology

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。The Nanning 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 tunneling 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 tunneling. 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 a reasonable value when tunneling. Other control measures should be taken as well.

关 键 词：盾构隧道 中等膨胀岩 盾构姿态 现场监测 

分 类 号：P642[天文地球—工程地质学]