针对南京地铁10号线过江隧道大直径泥水盾构接收端头为富水砂性土层这一不良地质条件,比选出最适宜的加固方式:水泥土三轴搅拌桩+高压旋喷桩+垂直冷冻固结。分析了大型泥水盾构水中接收的施工关键技术,采用工程应用与实测相结合的综合研究方法对垂直冻结施工及盾构接收期间地表沉降进行了现场实测研究,分析了垂直冻土墙的温度变化规律。接收端头地表沉降结果显示:盾构接收段加固区域内地表沉降≤4.6 mm,地基加固处理效果较好。采用水中接收技术能够保障富水砂层大盾构的安全接收。
Abstract
The large diameter slurry shield receiving end of Nanjing subway river-crossing tunnel in subway line No. 10 is water-rich sandy soil. The most appropriate way of reinforcement for the poor geological conditions were selected as follows: cement mixing pile-triaxial pressure rotary freezing spray pile-vertical consolidation, and the key technology and main points of large slurry shield water receiving were analyzed and summarized. The surface subsidence of the vertical frozen shield construction during receiving was investigated in situ test by adopting the combination of engineering application and actual research methods, and the vertical development rule of the temperature of the frozen soil wall was analyzed for judging whether the vertical frozen soil wall thickness and average temperature meet the requirements of shield to receive, and the time of getting rid portal was determined. Receiving end surface subsidence results showed that the land surface subsidence of the strengthening regional for the shield receiving is less than 4.6 mm, and we can draw a conclusion that the effect of the foundation reinforcement treatment is good. The water receiving technology can guarantee the rich sand layer security to receive large shield, and can provide important technical reference for future similar large shield receiving by this project research.
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基金
收稿日期:2014-01-02 修回日期:2014-05-19
基金项目:江苏省普通高校研究生科研创新计划项目(CXLX13-51); 江苏高校优势学科建设工程资助项目(PAPD); 南京地下铁道有限公司科研项目(D3-XY01-0001-1206)
第一作者:贲志江,硕士生。*通信作者:杨平,教授。E-mail: yangping@njfu.edu.cn。
引文格式:贲志江,杨平,陈长江,等. 地铁过江隧道大型泥水盾构的水中接收技术[J]. 南京林业大学学报:自然科学版,
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