Analysis and Control of Construction Disturbance in Small-Spacing Three-Bore Parallel Rectangular Pipe Jacking
-
摘要: 依托南宁地铁明秀路站换乘通道三孔并行矩形顶管工程,提出小间距下三孔并行矩形顶管施工控制措施,采用数值模拟和现场实测,开展顶管施工地表变形和顶管变形规律研究。数值模拟结果表明:顶管施工完成后地表沉降曲线呈三峰“波浪”形,中间顶管轴线处沉降最大;未采取和采取控制措施施工时地表沉降最大值分别为16.65 mm和5.46 mm,表明控制措施能有效减小地表沉降;采取控制措施后,顶管施工引起的地层扰动范围约为3倍顶管宽度。现场监测数据表明:地表沉降量在1.02~6.12 mm内,顶管始发和接收端地表沉降量较大。施工过程中通过采用严控顶进方向并即时纠偏、控制同步注浆、优化顶管施工顺序、槽钢焊接加固及渣土改良等措施,对控制地表沉降起到了很好的作用。Abstract: Based on the three-bore parallel rectangular pipe jacking project at Mingxiulu Station of the Nanning Metro, the construction control measures for small-spacing three-bore parallel pipe jacking were proposed. The investigation into ground settlement and pipe deformation was conducted using numerical simulation and field monitoring. The numerical analysis showed that the ground settlement curve presented a three-peak "wave" pattern, with the greatest settlement occurring at the axis of the middle pipe. The maximum ground settlements with and without implementing control measures were 16.65 mm and 5.46 mm, respectively, indicating that the measures effectively reduced settlement. The range of ground disturbance caused by construction was approximately three times the pipe width when control measures were implemented. Field monitoring results showed a ground settlement ranging from 1.02 mm to 6.12 mm, with larger settlements observed at the launch and reception ends. Key measures, including construction axis control and deflection correction, synchronous grouting, optimization of the construction sequence, channel steel reinforcement, and soil conditioning, were taken during the construction. These measures successfully controlled ground settlement.
-
Key words:
- rectangular jacking pipe /
- small spacing /
- ground settlement /
- pipe deformation /
- control measures
-
[1] 孙钧. 国内外城市地下空间资源开发利用的发展和问题[J]. 隧道建设(中英文),2019,39(5):699-709. [2] 贾连辉. 矩形顶管在城市地下空间开发中的应用及前景[J]. 隧道建设(中英文),2016,36(10):1269-1276. [3] 王虎,李栋,陈雪华,等. 矩形顶管技术的应用与发展[J]. 施工技术(中英文),2023,52(1):26-32. [4] SUN Y,WU F,SUN W J,et al. Two underground pedestrian passages using pipe jacking:case study[J]. Journal of Geotechnical and Geoenvironmental Engineering,2018,145(2),05018004. [5] 彭刚. 大断面矩形顶管近距离双线并行施工引发地表沉降分析[J]. 施工技术(中英文),2017,46(20):70-73. [6] 王紫娟,严佳佳,秦龙,等. 矩形顶管掘进地层变形规律数值模拟研究[J]. 科学技术与工程,2022,22(34):15349-15357. [7] 段景川,吴勇,严佳佳,等. 浅埋大断面顶管施工引起地基变形规律分析[J]. 建筑结构,2016,46(增刊2):510-515. [8] 周浩,马保松,赵阳森,等. 多因素下大断面矩形顶管施工对地层竖向变形影响研究[J]. 隧道建设(中英文),2020,40(9):1324-1332. [9] 程伟峰,江宏庆,张敬磊,等. 软土地区矩形顶管下穿高速公路施工全周期监测与分析[J]. 建筑结构,2022,52(增刊1):3131-3137. [10] 胡聪,郝英奇. 双线平行顶管在不同间距下施工的模型试验与数值模拟分析[J]. 建筑结构,2021,51(增刊2):1854-1860. [11] 陈雪华,周丽红,吴起星,等. 并行矩形顶管施工引起地层变形影响研究[J]. 土工基础,2022,36(4):551-558. [12] 王瑞珏. 双线矩形顶管下穿富水地层施工中地表沉降研究[J]. 山西建筑,2023,49(9):100-103. [13] MA S J,LI M Y,JIN J W,et al. The influence of shallow buried double-line parallel rectangular pipe jacking construction on ground settlement deformation[J]. Alexandria Engineering Journal,2021,60(1):1911-1916. [14] 黄建华,鲍锋,王蕴晨,等. 并行差异断面顶管施工对地表变形的影响[J]. 地质科技通报,2021,40(6):185-192. [15] 刘映晶. 顶管施工对紧邻隧道的附加影响研究[J]. 公路,2016,61(8):233-239. [16] 中华人民共和国住房和城乡建设部. 混凝土结构设计标准:GB/T 50010—2010[S]. 北京:中国建筑工业出版社,2024. [17] 李雪,张玉申,王洋洋,等. 砂卵石地层重叠盾构隧道掘进相互影响及控制措施研究[J]. 工业建筑,2022,52(3):10-16. -
点击查看大图
计量
- 文章访问数: 7
- HTML全文浏览量: 2
- PDF下载量: 0
- 被引次数: 0
登录
注册
E-alert
登录
注册
E-alert
下载: