登录
注册
E-alert
登录
注册
E-alert
Research on Transversal Settlement Characteristics of Strata Caused by Large Diameter in Shield Tunneling Slurry Pressure Balance
-
摘要: 基于现场实测的土体长期沉降数据，利用Peck经验算式，对横向地表沉降槽和横向深层土体沉降槽的形态、宽度系数和沉降影响范围进行研究。结果表明： 1）盾构施工引起的土体长期沉降，无论是横向地表沉降还是横向深层土体沉降均符合高斯曲线分布。受扰动土体固结的影响，沉降槽逐渐变深扩宽。2）从地表沉降来看，盾构掘进施工的横向影响范围为1.4倍的隧道直径，受土体长期固结影响增至2.3倍的隧道直径，对于深层土体沉降（埋深12.1 m处），盾构掘进施工的横向影响范围为0.8倍的隧道直径，随着时间的增长，影响范围扩大到1.2倍的隧道直径，盾构施工对深层土体的横向影响范围要小于地表。3）地表沉降和深层土体沉降宽度系数随盾尾脱离被监测断面时间的变化均符合指数分布，沉降宽度系数最终将趋于定值，但地表处沉降槽宽度系数的增长速率和量值均大于深层土体处。4）深层土体横向沉降曲线较陡峭，地表处土体横向沉降曲线较平缓，深层土体横向沉降曲线的曲率大于地表处土地横向沉降曲线的曲率，深层土体横向沉降较集中。Abstract: Based on on-site measured long-term soil settlement data, the Peck empirical formula was used to study the shape, width coefficient and influence range of transversal settlement troughs of ground and deep strata. The results showed that: 1) The long-term settlement of strata caused by shield tunneling, whether it was transversal settlement of ground or deep stratum settlement, conformed to the Gaussian distribution. Affected by the consolidation of disturbed soil, the settlement trough gradually deepened and widened. 2) From the perspective of ground settlement, the transversal settlement caused by shield tunneling construction was in a range of 1.4 times tunnel diameters, which would increase to a range of 2.3 times tunnel diameters due to long-term consolidation of soil. For the deep stratum settlement (buried at a depth of 12.1 m), the affected range by shield tunneling was 0.8 times of tunnel diameters, and over time, the affected range would expand to a range of 1.2 times tunnel diameters. The affected range by shield tunneling in the deep stratum was smaller than that in the ground. 3) The settlement width coefficients of the ground and deep stratum conformed to an exponential distribution with the time of disengagement of the shield tail from the measured cross-section, and leveled off eventually. However, the growth rate and amount of the width coefficient of ground settlement troughs were greater than those of deep soil. 4) The transveral settlement curve the of deep stratum was steep, while the transversal settlement curve of the ground was relatively flat. The curvature of the transversal settlement curve of the deep stratum was larger and more concentrated than that of the ground.
-
Key words:
- empirical formula /
- shield tunneling /
- settlement through /
- width factor /
- long-term settlement
-
[1] 张晓悦,张晓乐.软土地质条件下盾构隧道施工的变形规律研究[J].施工技术, 2017, 46(增刊1):805-808. [2] 戴洪伟.瘦西湖超大直径盾构隧道施工对周边环境影响分析[J].隧道建设, 2015, 35(4):316-321. [3] 苏凤阳,朱建才,李东泰,等.上软下硬地层大直径泥水盾构施工土体变形研究[J].建筑结构, 2022, 52(增刊2):2675-2681. [4] 骆冠勇,钟淼,曹洪,等.砂土层中盾构掘进实测数据及数值模拟分析[J].岩土力学, 2022, 43(增刊2):563-574. [5] 宁茂权,肖明清,晋学辉,等.沿江地铁盾构隧道掘进施工的地层扰动效应研究[J].铁道标准设计, 2023, 67(4):122-129. [6] 汲红旗,宋中华,刘维正,等.泥质砂岩地层盾构掘进施工扰动效应与地表纵向变形预测方法[J].中外公路, 2022, 42(1):28-33. [7] PECK R B. Deep excavations and tunneling in soft ground[C]//Proceedings of the 7th International Conference on Soil and Mechanics and Foundation Engineering. 1969:225-290. [8] O'REILLY M P, NEW B M. Settlements above tunnels in the United Kingdom their magnitude and prediction[C]//Proceedings of Tunneling 82. London:Institution of Mining and Metallurgy. 1982. 173-181. [9] MAIR R J, TAYLOR R N, BRACEGIRDLE A. Subsurface settlement profiles above tunnels in clays[J]. Geotechnique, 1993, 43(2):315-320. [10] 姜忻良,赵志民,李园.隧道开挖引起土层沉降槽曲线形态的分析与计算.岩土力学, 2004, 25(10):1542-1544. [11] 韩煊,李宁, STANDING J R.地铁隧道施工引起地层位移规律的探讨.岩土力学, 2007, 28(3):609-613. [12] 侯学渊,廖少明.盾构隧道沉降预估[J].地下工程与隧道, 1993(4):24-32. [13] 刘松樵.软土扰动地层再固结及其对地铁隧道的影响[D].上海:同济大学, 2007. [14] 张忠苗,林存刚,吴世明,等.泥水盾构施工引起的地面固结沉降实例研究[J].浙江大学学报(工学版), 2012(3):431-440. [15] 刘建航,侯学渊.盾构法隧道[M].北京:中国铁道出版社, 1991. [16] 梁荣柱.软土盾构隧道掘进环境效应及其邻近开挖响应研究[D].杭州:浙江大学, 2016. -
点击查看大图
计量
- 文章访问数: 38
- HTML全文浏览量: 3
- PDF下载量: 0
- 被引次数: 0
下载:
