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| EXPERIMENTAL STUDY OF GROUTING PLANS OF SHALLOW TUNNELING METHOD TO IMPROVE INTENSITY IN MUD GROUND |
| WU Yanping1，2，WANG Jun1，LIU Jianmin3，CHEN Guangzai1，CHEN Chunlei2 |
(1. College of Architecture and Civil Engineering，Wenzhou University，Wenzhou，Zhejiang 325035，China；
2. Wenzhou Municipal Urban Construction Architectural Institute，Wenzhou，Zhejiang 325035，China；
3. Shandong Earthquake Project Research Institute，Jinan，Shandong 250021，China) |
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Abstract In allusion to the Wenzhou typical soft soil properties，combined with pedestrian subway channel engineering in Wenzhou No.2 subsidiary hospital，taking advantage of ordinary cement-sodium silicate double liquid，superfine cement-sodium silicate double liquid and specially made sulphoaluminate cement paste three kinds of soil improvement grouting materials，i. e. a series of indoor laboratory tests and field injectivity tests are carried out. The results show that compasion of superfine cement with the same quantity of the general cement，they have the same intensity，the superfine cement gelation time is long and it is vulnerable to be diluted by the ground water. Compared with the general cement，the superfine cement cost is about 3 times higher，so it is suggested that general cement instead of the superfine cement grouting materials to reinforce silty horizon. The in-situ experiment shows that the grout diffusion radius and compressive strength increases with the increase of grouting pressure under the same grouting time；grout diffusion radius increases with the increase of grouting speed under the same grouting pressure，but the growth trend slows down with the increase of injection rate，. Moreover，the key parameters of grouting have been ascertained and confirmed in practice，the grout diffusion radius is 1.0–3.0 m，the terminate pressure in grouting is 1.0–1.5 MPa，the reinforced depth of grouting is 4–5 m. After grouting，analysis method and sampling method after excavation are inducted to inspect the grouting effect，the results indicate that the grouting effect is in accord with the design construction requirements. The successful application of the grouting project has very good reference and broad application prospect for underground reinforcement engineering in Wenzhou region and Yangtze river delta with rich deep weak silty soil.
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Received: 23 April 2012
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| [1] 施仲衡，张 弥. 地下铁道设计与施工[M]. 西安：陕西科学技术出版社，1997：135–368.(SHI Zhongheng，ZHANG Mi. The underground railway design and construction[M]. Xi?an：Shaanxi Scientific and Technological Press，1997：135–368.(in Chinese))
[2] 张海波. 地铁隧道盾构法施工对周围环境影响的数值模拟[博士学位论文][D]. 南京：河海大学，2005.(ZHANG Haibo. Numerical simulation of the environment impart of shield tunnel construction group to the surrounding area[Ph. D. Thesis][D]. Nanjing：Hohai University，2005.(in Chinese))
[3] 孔 恒. 城市地铁隧道浅埋暗挖法地层预加固机制及其应用研究[博士学位论文][D]. 北京：北方交通大学，2003.(KONG Heng. Reasearch of mechanism of pre-reinforcement and the application of shallow depth of underming method of urban subway tunnel[Ph. D. Thesis][D]. Beijing：Northern Jiaotong University，2003.(in Chinese))
[4] 王梦恕. 地下工程浅埋暗挖技术通论[M]. 合肥：安徽教育出版社，2005：683–708.(WANG Mengshu. General of underming method of underground engineering[M]. Hefei：Anhui Education Press，2005：683–708.(in Chinese))
[5] 邝健政，昝月稳. 岩土注浆理论与工程实例[M]. 北京：科学出版社，2001：5–160.(KUANG Jianzheng，ZAN Yuewen. Geotechnical grouting theory and engineering practice[M]. Beijing：Science Press，2001：5–160.(in Chinese))
[6] 王星华. 黏土固化浆液在地下工程中的应用[M]. 北京：中国铁道出版社，1998：10–183.(WANG Xinghua. Clay curing grout in underground engineering application[M]. Beijing：China Railway Publishing House，1998：10–183.(in Chinese))
[7] 郑志刚. 注浆材料及其选用[J]. 科技情报开发与经济，2004，14(9)：227–228.(ZHENG Zhigang. Grouting materials and how to choose[J]. Science and Technology Information Development and Economy，2004，14(9)：227–228.(in Chinese))
[8] 刘孔凡，焦莉莉. 普通水泥稳定浆液的研究[J]. 水利水电技术，1998，12(1)：48–50.(LIU Kongfan，JIAO Lili. Ordinary cement slurry stability research[J]. Water Resources and Hydropower Engineering，1998，12(1)：48–50.(in Chinese))
[9] 王 乾，曲立清，郭洪雨，等. 青岛胶州湾海底隧道围岩注浆加固技术[J]. 岩石力学与工程学报，2011，30(4)：790–802.(WANG Qian，QU Liqing，GUO Hongyu，et al. Grouting reinforcement technique of Qingdao Jiaozhou bay subsea tunnel[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(4)：790–802.(in Chinese))
[10] 王文杰，鲁法曾. 超细水泥[J]. 山东建材，1994，5(1)：46–48.(WANG Wenjie，LU Fazeng. Superfine cement[J]. Shandong Building Material，1994，5(1)：46–48.(in Chinese)) |
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2013, Vol. 32 
