浅覆土小间距矩形顶管施工地表变形控制技术
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摘要
为研究顶管施工过程中的地表变形规律,探索地表变形的的控制技术,最大限度地保证顶管施工过程的安全,依托某总部地下停车场项目,针对国内首例采用结构分割转换工法(CC工法)实施的矩形顶管工程施工地表变形影响因素进行分析,主要包括覆土厚度、施工过程地层损失、隧道小间距施工对相邻隧道土体作用等。研究分析表明:1)通过采取控制掘进速度、控制土舱压力、控制注浆量、控制出渣量、控制顶进姿态等地表沉降控制技术措施,有效地控制了地表变形; 2)在顶推过程的各个阶段,地表变形呈现不同的特点,当出现变形过大时,通过调整土舱压力、补充注浆等控制措施,使地表变形逐渐趋于稳定变化状态; 3)通过对施工过程地表变形监测数据整理分析,进一步验证了采取地表变形控制措施的有效性和必要性。
During the construction of underground works by pipe jacking method, surface deformation is often caused by construction disturbances, and there is a great safety risk during the construction process. Therefore, it is of great significance to study the law of surface deformation in the process of pipe jacking, and explore the surface deformation control technology for ensuring the safety of the pipe jacking. The surface deformation influencing factors, i.e. thickness of covering soil, soil loss during construction and effect of small-spacing tunnel construction on adjacent tunnel, are analyzed by taking a rectangular pipe jacking project constructed by structural cut and convert(CC) method for the first time in China for example. The analytical results show that:(1) The surface deformation has been brought under effective control by controlling excavation speed, soil chamber stress, grouting amount, mucking amount and pipe attitude.(2) The surface deformation varies with thrusting, and it becomes stable by adjusting soil chamber stress and supplementary grouting.(3) The effectiveness and necessity of the deformation control measures are verified by deformation monitoring data analysis.
During the construction of underground works by pipe jacking method, surface deformation is often caused by construction disturbances, and there is a great safety risk during the construction process. Therefore, it is of great significance to study the law of surface deformation in the process of pipe jacking, and explore the surface deformation control technology for ensuring the safety of the pipe jacking. The surface deformation influencing factors, i.e. thickness of covering soil, soil loss during construction and effect of small-spacing tunnel construction on adjacent tunnel, are analyzed by taking a rectangular pipe jacking project constructed by structural cut and convert(CC) method for the first time in China for example. The analytical results show that:(1) The surface deformation has been brought under effective control by controlling excavation speed, soil chamber stress, grouting amount, mucking amount and pipe attitude.(2) The surface deformation varies with thrusting, and it becomes stable by adjusting soil chamber stress and supplementary grouting.(3) The effectiveness and necessity of the deformation control measures are verified by deformation monitoring data analysis.
引文
[1] 景路, 袁聚云, 袁勇. 顶管工程中的地层损失参数和土体变形计算[J]. 岩土力学, 2013, 34(增刊1): 173.JING Lu, YUAN Juyun, YUAN Yong. Ground loss parameter and soil deformation in pipe jacking[J]. Rock and Soil Mechanics, 2013, 34(S1): 173.
[2] 赵宁. 顶管施工的土体变形问题研究[D]. 上海: 同济大学, 2008.ZHAO Ning. Analysis of soil deformation caused by pipe jacking construction[D]. Shanghai: Tongji University, 2008.
[3] 魏纲, 徐日庆, 郭印. 顶管施工引起的地面变形计算方法综述[J]. 市政技术, 2005(6): 350.WEI Gang, XU Riqing, GUO Yin. Review on calculation method for ground deformation induced by pipe jacking construction[J]. Municipal Engineering Technology, 2005(6): 350.
[4] 樊永强. 顶管穿越建筑物及地下管线时的沉降控制[J]. 城市道桥与防洪, 2013(9): 152.FAN Yongqiang. Settlement control when pipe jacking passes through buildings and underground pipelines[J]. Urban Roads Bridges & Flood Control, 2013(9): 152.
[5] 邓长茂, 彭基敏, 沈国红. 软土地区矩形顶管施工地表变形控制措施探讨[J]. 地下空间与工程学报, 2016(4): 1002.DENG Changmao, PENG Jimin, SHEN Guohong. Discussion on control methods of ground surface settlement caused by rectangular pipe jacking construction in soft soils[J]. Chinese Journal of Underground Space and Engineering, 2016(4): 1002.
[6] 周向阳, 林清辉. 浅覆土大断面顶管施工对运营盾构隧道变形影响及控制措施[J]. 工程勘察, 2016(12): 7.ZHOU Xiangyang, LIN Qinghui. Deformation effect and control measures of shield tunnel deformation induced by shallow buried pipe jacking[J]. Geotechnical Investigation & Surveying, 2016(12): 7.
[7] 袁凯, 顾建平. 大型顶管变形控制技术探讨[J]. 江苏建筑, 2017(5): 56.YUAN Kai, GU Jianping. Discussion on deformation control technology of large pipe jacking[J]. Jiangsu Construction, 2017(5): 56.
[8] 朱剑, 李振勇, 张泷. 复杂环境下大断面矩形顶管法施工过程地表沉降规律及控制措施研究[J]. 岩土工程技术, 2017(1): 49.ZHU Jian, LI Zhenyong, ZHANG Long. Study on surface subsidence law and control measures in large section rectangular pipe jacking method in complex environment[J]. Geotechnical Engineering Technique, 2017(1): 49.
[9] 荣亮, 杨红军. 郑州市下穿中州大道超大断面矩形顶管隧道施工沉降控制技术[J]. 隧道建设, 2015, 35(12): 1338.RONG Liang, YANG Hongjun. Settlement control technology for tunnel crossing underneath Zhongzhou avenue in Zhengzhou constructed by super-large rectangular cross-section pipe-jacking machine[J]. Tunnel Construction, 2015, 35(12): 1338.
[10] 顾阳华. 顶管施工时对周边环境的沉降控制[J]. 建筑施工, 2015(5): 601.GU Yanghua. Settlement control over surrounding environment during pipe-jacking construction[J]. Building Construction, 2015(5): 601.
[11] 王伟. 顶管施工过程中的地面沉降风险控制[J]. 江苏水利, 2016(11): 54.WANG Wei. Risk control of land subsidence in the process of pipe jacking construction[J]. Jiangsu Water Resources, 2016(11): 54.
[12] 杨烨旻. 顶管施工注浆作用及环境效应研究[D]. 上海: 上海交通大学, 2010.YANG Yemin. Research on grouting mechanism and environmental effects of pipe jacking[D]. Shanghai: Shanghai Jiao Tong University, 2010.
[13] 李铮华. 矩形顶管施工对邻近建筑物的影响分析[D]. 广州: 广州大学, 2014.LI Zhenghua. Analysis of influence of rectangular pipe jacking construction on neighboring buildings[D]. Guangzhou: Guangzhou University, 2014.
[2] 赵宁. 顶管施工的土体变形问题研究[D]. 上海: 同济大学, 2008.ZHAO Ning. Analysis of soil deformation caused by pipe jacking construction[D]. Shanghai: Tongji University, 2008.
[3] 魏纲, 徐日庆, 郭印. 顶管施工引起的地面变形计算方法综述[J]. 市政技术, 2005(6): 350.WEI Gang, XU Riqing, GUO Yin. Review on calculation method for ground deformation induced by pipe jacking construction[J]. Municipal Engineering Technology, 2005(6): 350.
[4] 樊永强. 顶管穿越建筑物及地下管线时的沉降控制[J]. 城市道桥与防洪, 2013(9): 152.FAN Yongqiang. Settlement control when pipe jacking passes through buildings and underground pipelines[J]. Urban Roads Bridges & Flood Control, 2013(9): 152.
[5] 邓长茂, 彭基敏, 沈国红. 软土地区矩形顶管施工地表变形控制措施探讨[J]. 地下空间与工程学报, 2016(4): 1002.DENG Changmao, PENG Jimin, SHEN Guohong. Discussion on control methods of ground surface settlement caused by rectangular pipe jacking construction in soft soils[J]. Chinese Journal of Underground Space and Engineering, 2016(4): 1002.
[6] 周向阳, 林清辉. 浅覆土大断面顶管施工对运营盾构隧道变形影响及控制措施[J]. 工程勘察, 2016(12): 7.ZHOU Xiangyang, LIN Qinghui. Deformation effect and control measures of shield tunnel deformation induced by shallow buried pipe jacking[J]. Geotechnical Investigation & Surveying, 2016(12): 7.
[7] 袁凯, 顾建平. 大型顶管变形控制技术探讨[J]. 江苏建筑, 2017(5): 56.YUAN Kai, GU Jianping. Discussion on deformation control technology of large pipe jacking[J]. Jiangsu Construction, 2017(5): 56.
[8] 朱剑, 李振勇, 张泷. 复杂环境下大断面矩形顶管法施工过程地表沉降规律及控制措施研究[J]. 岩土工程技术, 2017(1): 49.ZHU Jian, LI Zhenyong, ZHANG Long. Study on surface subsidence law and control measures in large section rectangular pipe jacking method in complex environment[J]. Geotechnical Engineering Technique, 2017(1): 49.
[9] 荣亮, 杨红军. 郑州市下穿中州大道超大断面矩形顶管隧道施工沉降控制技术[J]. 隧道建设, 2015, 35(12): 1338.RONG Liang, YANG Hongjun. Settlement control technology for tunnel crossing underneath Zhongzhou avenue in Zhengzhou constructed by super-large rectangular cross-section pipe-jacking machine[J]. Tunnel Construction, 2015, 35(12): 1338.
[10] 顾阳华. 顶管施工时对周边环境的沉降控制[J]. 建筑施工, 2015(5): 601.GU Yanghua. Settlement control over surrounding environment during pipe-jacking construction[J]. Building Construction, 2015(5): 601.
[11] 王伟. 顶管施工过程中的地面沉降风险控制[J]. 江苏水利, 2016(11): 54.WANG Wei. Risk control of land subsidence in the process of pipe jacking construction[J]. Jiangsu Water Resources, 2016(11): 54.
[12] 杨烨旻. 顶管施工注浆作用及环境效应研究[D]. 上海: 上海交通大学, 2010.YANG Yemin. Research on grouting mechanism and environmental effects of pipe jacking[D]. Shanghai: Shanghai Jiao Tong University, 2010.
[13] 李铮华. 矩形顶管施工对邻近建筑物的影响分析[D]. 广州: 广州大学, 2014.LI Zhenghua. Analysis of influence of rectangular pipe jacking construction on neighboring buildings[D]. Guangzhou: Guangzhou University, 2014.