大断面矩形顶管施工对周围土体扰动实测分析
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摘要
依托苏州市某大断面软土地层矩形顶管建造综合管廊隧道工程,通过分析施工期间的土体孔隙水压力、土压力、深层土体水平位移、地表沉降等土体扰动监测数据,揭示了大断面矩形顶管施工对土体扰动规律。结果表明:矩形与圆形顶管产生的土体扰动存在差异,主要表现在矩形顶管附近土体最大水平位移发生在距顶管上表面一定距离处,矩形顶管产生的地表沉降曲线底部较为平缓;矩形顶管对土体的扰动与顶管机距监测断面距离有密切联系,随着顶管机逐渐靠近,土体的土压力、水平位移及孔隙水压力受扰动变得剧烈,顶管机通过后土体扰动逐渐减弱;顶管顶进速率越快,对周围土体扰动越大,现场加快顶管速率应谨慎;而施工停顿后,土体有向管壁移动的趋势,停工期间不能停止向管壁注入膨润土泥浆。
Based on the project of rectangular pipe-jacking in a large section of soft soil stratum in Suzhou. The disturbance law of large section rectangular pipe-jacking construction to soil was revealed by analyzing the monitoring data of soil disturbance such as pore water pressure, soil pressure, horizontal displacement of deep soil and surface settlement during construction. The results showed that there are differences between rectangular pipe-jacking and circular pipe-jacking in soil disturbance. The maximum horizontal displacement of soil near rectangular pipe-jacking occurs at a certain distance from the top surface of pipe-jacking, and the surface settlement curve generated by rectangular pipe-jacking is relatively flat at the bottom. The disturbance of rectangular pipe-jacking to soil is closely related to the distance between pipe-jacking machine and monitoring section, and with the pipe-jacking machine approaching gradually, the disturbance of soil pressure, horizontal displacement and pore water pressure becomes intense, and the disturbance of soil gradually weakens after pipejacking. The faster jacking rate is, the greater soil disturbance would be, the more cautious field acceleration of pipe-jacking rate should be. After the construction stops, the soil tends to move towards the pipe wall, the injection of bentonite mud into the pipe wall cannot be stopped during the suspension period.
Based on the project of rectangular pipe-jacking in a large section of soft soil stratum in Suzhou. The disturbance law of large section rectangular pipe-jacking construction to soil was revealed by analyzing the monitoring data of soil disturbance such as pore water pressure, soil pressure, horizontal displacement of deep soil and surface settlement during construction. The results showed that there are differences between rectangular pipe-jacking and circular pipe-jacking in soil disturbance. The maximum horizontal displacement of soil near rectangular pipe-jacking occurs at a certain distance from the top surface of pipe-jacking, and the surface settlement curve generated by rectangular pipe-jacking is relatively flat at the bottom. The disturbance of rectangular pipe-jacking to soil is closely related to the distance between pipe-jacking machine and monitoring section, and with the pipe-jacking machine approaching gradually, the disturbance of soil pressure, horizontal displacement and pore water pressure becomes intense, and the disturbance of soil gradually weakens after pipejacking. The faster jacking rate is, the greater soil disturbance would be, the more cautious field acceleration of pipe-jacking rate should be. After the construction stops, the soil tends to move towards the pipe wall, the injection of bentonite mud into the pipe wall cannot be stopped during the suspension period.
引文
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[9]喻军,龚晓南.考虑顶管施工过程的地面沉降控制数值分析[J].岩石力学与工程学报,2014, 33(S1):2605-2610Yu Jun,Gong Xiaonan. Numerical analysis of surface settlement control considering pipe jacking construction process[J].Chinese Journal of Rock Mechanics and Engineering, 2014,33(S1):2605-2610
[10]魏纲,李志渊,王彬.软土地层矩形顶管隧道工后地表沉降计算方法研究[J].隧道建设,2016,36(12):1421-1427Wei Gang, Li Zhiyuan, Wang Bin. Study of calculation methods for ground surface settlement induced by rectangular pipe jacking tunnel boring in soft soil[J]. Tunnel Construction,2016, 36(12):1421-1427
[11]王晓睿,周峰,张振,等.超大断面矩形顶管隧道施工动态变形规律[J].地球科学,2016, 41(11):1959-1965Wang Xiaorui, Zhou Feng, Zhang Zhen, et al. Dynamic deformation of the oversized cross-section rectangular pipe-jacking tunnel[J]. Earth Science, 2016. 41(11):1959-1965
[2]张鹏,马保松,曾聪,等.基于管土接触特性的顶进力计算模型分析[J].岩土工程学报,2017, 39(2):244-249Zhang Peng, Ma Baosong, Zeng Cong,et al. Numerical model for jacking force based on pipe-soil contact characteristics[J].Chinese Journal of Geotechnical Engineering, 2017, 39(2):244-249
[3]隋涛.大直径深层调蓄排水盾构隧道的受力特性分析[J].特种结构,2016, 33(1):22-28Sui Tao. Force Analysis of Deep Buried Storage and DrainageSield Tunnel with Large Diameter[J]. Special Structures, 2016,33(1):32-38
[4]魏纲,徐日庆,屠玮.顶管施工引起的土体扰动理论分析及试验研究[J].岩石力学与工程学报,2004(3):476-482Wei Gang, Xu Riqing, Tu Wei. Testing study and analysis on soil disturbance induced by pipe jacking construction[J]. Chinese Journal of Rock Mechanics and Engineering, 2004(3):476-482
[5]房营光,莫海鸿,张传英.顶管施工扰动区土体变形的理论与实测分析[J].岩石力学与工程学报,2003(4):601-605Fang Yingguang, Mo Haihong, Zhang Chuanying. Theoretical and testing analysis of soil deformation in the area of disturbance caused by pipe-jacking[J]. Chinese Journal of Rock Mechanics and Engineering. 2003(4):601-605
[6]施成华,黄林冲.顶管施工隧道扰动区土体变形计算[J].中南大学学报(自然科学版),2005(2):323-328Shi Chenhua,Huang Linchong. Calculation of soil deformation in area of disturbance due to pipe-jacking construction[J]. Journal of Central South University of Technology(science and technology), 2005(2):323-328
[7]白廷辉,刘树佳,廖少明.软土地区盾构掘进速度对地层扰动现场试验研究[J].岩土力学,2016, 37(7):2040-2046Bai Tinghui, Liu Shujia, Liao Shaoming. Experimental study of disturbance caused by the advancing speed of shield tunneling in soft soil[J]. Rock and Soil Mechanics, 2016, 37(7):2040-2046
[8]冯海宁,温晓贵,魏纲,等.顶管施工对土体影响的现场试验研究[J].岩土力学,2003(5):781-785Feng Haining, Wen Xiaogui, Wei Gang, et al. In-situ test research on influence of pipe jacking on soil[J]. Rock and Soil Mechanics, 2003(5):781-785
[9]喻军,龚晓南.考虑顶管施工过程的地面沉降控制数值分析[J].岩石力学与工程学报,2014, 33(S1):2605-2610Yu Jun,Gong Xiaonan. Numerical analysis of surface settlement control considering pipe jacking construction process[J].Chinese Journal of Rock Mechanics and Engineering, 2014,33(S1):2605-2610
[10]魏纲,李志渊,王彬.软土地层矩形顶管隧道工后地表沉降计算方法研究[J].隧道建设,2016,36(12):1421-1427Wei Gang, Li Zhiyuan, Wang Bin. Study of calculation methods for ground surface settlement induced by rectangular pipe jacking tunnel boring in soft soil[J]. Tunnel Construction,2016, 36(12):1421-1427
[11]王晓睿,周峰,张振,等.超大断面矩形顶管隧道施工动态变形规律[J].地球科学,2016, 41(11):1959-1965Wang Xiaorui, Zhou Feng, Zhang Zhen, et al. Dynamic deformation of the oversized cross-section rectangular pipe-jacking tunnel[J]. Earth Science, 2016. 41(11):1959-1965