Abstract：Dongshankou station of Guangzhou metro line #6 is constructed by expanding shield driven tunnel. The ground building?s piles are in the strata of high moisture content and void ratio，so the new station construction is easy to cause large surface settlement. Taking into account the influence of construction on the groundwater level，the application effect of in-situ deformation control measure is predicted by numerical simulation method，which is compared with the measurement data. The results show that：(1) The ratio of water loss settlement to expanding excavation settlement is 2∶3. (2) Settlement during upper-bench excavation is large，and there is little difference between two-step and four-step excavation scheme. The maximum surface settlement of shield tunnel expanding method accounts for 65% of CRD construction method. (3) the advance pre-support in the arch increases the width of the settlement trough and decreases the surface settlement and inclination. The axis deviation scheme of shield machine reduces the area of plastic zone，making the effect of the advance pre-support more obvious.
[1] 刘维宁，路美丽，张新金，等. 盾构法和浅埋暗挖法结合建造地铁车站的模型试验[J]. 岩石力学与工程学报，2009，28(8)：1 630–1 639.(LIU Weining，LU Meili，ZHANG Xinjin，et al. Model test on metro station constructed by combination of shield method and shallow tunneling method[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 630–1 639.(in Chinese))
[2] 路美丽. 盾构先行条件下拓展地铁车站的方案研究及风险分析[博士学位论文][D]. 成都：西南交通大学，2007.(LU Meili. Study on schemes and risk analysis of the expanded metro station under shield running tunnel[Ph. D. Thesis][D]. Chengdu：Southwest Jiaotong University，2007.(in Chinese))
[3] TONON F. Methods for enlarging transportation Tunnels while keeping tunnels fully operational[J]. Practice Periodical on Structural Design and Construction，2010，15(4)：248–271.
[4] 林镇洪. 单边扩帮特大跨公路隧道开挖稳定性分析[J]. 铁道科学与工程学报，2009，6(4)：46–50.(LIN Zhenhong. Stability analysis for large-span highway tunnel by side-expand excavation[J]. Journal of Railway Science and Engineering，2009，6(4)：46–50.(in Chinese))
[5] MASHIMO H，ISHIMURA T，ISAGO N，et al. Behavior of support structure of existing tunnels during enlargement of cross section[C]// ITA——AITES 2005 World Tunnel Congress. Rotterdam：[s. n.]，2005：133–138.
[6] 黄明利，范宏柱，谭忠盛. 浅埋既有人防隧道扩挖地铁车站施工技术研究[C]// 第十一次全国岩石力学与工程学术大会论文集. 北京：中国电力出版社，2010：307–312.(HUANG Mingli，FAN Hongzhu，TAN Zhongsheng. Study of construction technique of metro station driven with enlarging existing shallow air defense tunnel[C]// Proceedings of the 11th National Academic Conference of Rock Mechanics and Engineering. Beijing：China Electric Power Press，2010：307–312.(in Chinese))
[7] 吴张中，徐光黎，吴 立，等. 超大断面隧道侧向扩挖施工围岩力学特征研究[J]. 岩土工程学报，2009，31(2)：172–177.(WU Zhangzhong，XU Guangli，WU Li，et al. Mechanical deformation characteristics of rock mass surrounding lateral enlarging excavation of tunnels with ultra-large sections[J]. Chinese Journal of Geotechnical Engineering，2009，31(2)：172–177.(in Chinese))
[8] 李 茜. 盾构先行过站建造立柱式地铁车站研究[硕士学位论文][D]. 北京：北京交通大学，2006.(LI Qian. Column-style subway station constructed by expanding shield running tunnel[M. S. Thesis][D]. Beijing：Beijing Jiaotong University，2006.(in Chinese))
[9] 李 围，何 川，张海波. 扩挖盾构隧道建成两连拱地铁车站模型试验[J]. 岩土力学，2008，29(12)：3 261–3 265.(LI Wei，HE Chuan，ZHANG Haibo. Model test of twin-bore metro station constructed with expanding shield tunnel[J]. Rock and Soil Mechanics，2008，29(12)：3 261–3 265.(in Chinese))
[10] 张新金，刘维宁，李海锋，等. 盾构扩挖法建造地铁车站的支撑方案优化[J]. 中国铁道科学，2008，29(5)：77–82.(ZHANG Xinjin，LIU Weining，LI Haifeng，et al. Optimization of the supporting system for constructing metro station by enlarging shield tunnels[J]. China Railway Science，2008，29(5)：77–82.(in Chinese))
[11] 张新金，刘维宁，路美丽，等. 盾构法和浅埋暗挖法结合建造地铁车站模型试验的方案设计[J]. 中国铁道科学，2010，31(1)：66–71. (ZHANG Xinjin，LIU Weining，LU Meili，et al. Scheme design on the model test of the metro station constructed by shield method and shallow mining method[J]. China Railway Science，2010，31(1)：66–71. (in Chinese))
[12] 覃卫民，赵荣生，王 浩，等. 浅埋大跨隧道下穿建筑物的安全影响研究[J]. 岩石力学与工程学报，2010，29(增2)：3 762–3 768. (QIN Weimin，ZHAO Rongsheng，WANG Hao，et al. Study of building safety during shallow large-span tunnel underpassing[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：3 762–3 768.(in Chinese))
[13] 施成华，彭立敏，刘宝琛. 浅埋隧道开挖对地表建筑物的影响[J]. 岩石力学与工程学报，2004，23(19)：3 310–3 316.(SHI Chenghua，PENG Limin，LIU Baochen. Influence of shallow tunnel excavation on ground surface building[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(19)：3 310–3 316.(in Chinese))
[14] LECA E. Settlements induced by tunneling in soft ground[J]. Tunnelling and Underground Space Technology，2007，22(2)：119–149.
[15] 孙 钧. 地下工程设计理论与实践[M]. 上海：上海科学技术出版社，1996：125–133.(SUN Jun. Theory and practice of underground engineering[M]. Shanghai：Shanghai Science and Technology Press，1996：125–133.(in Chinese))
[16] 吴 波，高 波，索晓明. 地铁隧道开挖与失水引起地表沉降的数值分析[J]. 中国铁道科学，2004，25(4)：59–63.(WU Bo，GAO Bo，SUO Xiaoming. Numerical simulation of land subsidence effect induced by metro tunnel excavation and water loss[J]. China Railway Science，2004，25(4)：59–63.(in Chinese))
2013, Vol. 32 
