考虑刀盘推力的泥水盾构隧道开挖面平衡机理研究及应用

段丽敏; 王建; 侯丽平; 鲁洋; 闵凡路; 毛子铭

doi:10.11779/CJGE20230324

考虑刀盘推力的泥水盾构隧道开挖面平衡机理研究及应用 English Version

1.
河海大学水利水电学院, 江苏南京 210024
2.
河南省西霞院水利枢纽输水及灌区工程建设管理局, 河南郑州 450000
3.
河海大学土木与交通学院, 江苏南京 210024

基金项目:

国家自然科学基金项目 52279099

国家自然科学基金项目 52078189

详细信息

作者简介:
段丽敏(1994—)，女，博士研究生，从事水工结构数模及盾构隧道工程研究。E-mail: duanlm1994@outlook.com

通讯作者:
王建, E-mail: wang_jian@hhu.edu.cn

中图分类号: TU43;U455.43
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- 文章访问数: 363
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出版历程
- 收稿日期: 2023-04-13
- 网络出版日期: 2023-11-15
- 刊出日期: 2024-06-30

Research and application of balance mechanism of excavation surface of slurry shield tunnels considering cutterhead thrust

1.
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China
2.
Water Conservancy and Irrigation District Engineering Construction Administration of Xixiayuan Water Conservancy Project, Zhengzhou 450000, China
3.
College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, China

摘要

摘要: 现有泥水盾构隧道开挖面平衡机理中，开挖面的支护多认为全部由泥浆压力提供，刀盘推力在支护中的作用少有提及。针对穿沁泥水盾构隧洞工程存在的开挖面支护具体问题，结合开挖面支护主控参数分析，揭示了考虑刀盘推力的泥水盾构隧道开挖面平衡机理，给出了刀盘推力具体表达式。运用所揭示的平衡机理，结合提出的一种盾壳外侧摩阻力估计方法，对该工程的3个重点穿越段进行了开挖面支护力计算和稳定分析。研究表明：3个重点穿越段的掘进中，刀盘推力分别占开挖面支护力的21%，24%，11%；同时考虑泥浆压力和刀盘推力的开挖面支护力，与仅考虑泥浆压力相比，在开挖面前方的轴向水土合力存在区间内占比分别由0，0和78%分别提高至78%，32%和88%，表明刀盘推力在开挖面支护中发挥了重要作用。
- 泥水盾构 /
- 开挖面 /
- 支护 /
- 稳定 /
- 刀盘推力 /
- 总推力 /
- 泥浆压力
Abstract: In the existing balance mechanism of the excavation surface of slurry shield tunnels, the support of the excavation surface is mostly considered to be provided by mud pressure, and the role of cutterhead thrust in the support is rarely mentioned. In response to the specific problem of excavation surface support in the Chuanqin slurry shield tunnel project, based on the analysis of the main control parameters of excavation surface support, the balance mechanism of the excavation surface of the slurry shield tunnel considering the cutterhead thrust is revealed, and a specific expression for the cutterhead thrust is proposed. Using the revealed equilibrium mechanism and the proposed method for estimating the external frictional resistance of the shield shell, the calculation of excavation support force and the stability analysis are conducted for the three key crossing sections of the project. The research shows that in the excavation of the three key crossing sections, the cutterhead thrust accounts for 21%, 24% and 11% of the excavation face support force, respectively. Considering both the mud pressure and the cutterhead thrust, the proportion of the combined axial water and soil forces in the presence range in front of the excavation face increases from 0, 0 and 78% to 78%, 32% and 88%, respectively, compared to only considering the mud pressure. It is indicated that the cutterhead thrust plays an important role in the excavation face support.
- slurry shield /
- excavation surface /
- support /
- stability /
- cutterhead thrust /
- total thrust /
- mud pressure

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图 1 隧洞穿越右岸大堤段地层结构图

Figure 1. Stratigraphic structure of tunnel crossing right bank embankment section

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图 2 隧洞穿越重点段泥浆压与轴向地应力曲线

Figure 2. Curves of mud pressure and axial geostress in key crossing sections of tunnel

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图 3 泥水盾构工作示意图

Figure 3. Schematic diagram of operation of slurry shield

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图 4 开挖面与泥水盾构机轴向受力示意图

Figure 4. Schematic diagram of axial force on excavation surface and slurry shield machine

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图 5 径向有效土压总和计算简图

Figure 5. Simplified diagram for calculating total radial effective earth pressure

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图 6 隧洞穿越重点段支护力与轴向地层力曲线

Figure 6. Curves of mud pressure and axial geostress for key crossing sections of tunnel

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表 1 隧洞穿越地层类型及相关物理力学参数

Table 1 Stratum types and related physical and mechanical parameters crossed by tunnel

编号	名称	干密度/(kg·m^-3)	黏聚力/kPa	内摩擦角/(°)	轴向压力系数K₀^’
1	重粉质壤土	1540	27	21	0.33
2	粉砂	1510	0	22	0.25
3	细砂	1550	0	24	0.28
4	粉质黏土	1510	30	11	0.43
5	重粉质壤土	1560	25	18	0.33
6	轻粉质壤土	1470	16	21	0.30
7	重粉质壤土	1520	20	20	0.33
8	粉质黏土	1530	27	18	0.43
9/10	重粉质壤土	1650	21	19	0.33
11/12	中细砂	1700	0	27	0.28
13	人工填土	1540	27	21	0.33
14	防渗心墙	2400	—	—	—

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表 2 隧洞穿越重点段泥浆压与轴向地应力及其区间之比

Table 2 Ratios of mud pressure to axial geostress and intervals in key crossing sections of tunnel

编号	地段	$\frac{{{p_{\text{m}}}}}{{{p_{\text{w}}} + {p_{{\text{as}}}}}}$	$\frac{{p}_{\text{m}}}{{\left({p}_{\text{w}}+{p}_{\text{as}}\right)}_{区间}}$
1	右岸大堤段	0.83	0
2	沁河河槽段	0.76	0
3	左岸大堤段	1.04	0.78

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表 3 隧洞穿越重点段刀盘推力在开挖面支护力中的平均占比

Table 3 Average proportions of cutterhead thrust in excavation face support force in key crossing sections of tunnel 单位: %

右岸大堤段	沁河河槽段	左岸大堤段
21	24	11

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表 4 隧洞穿越重点段支护力均值及在轴向地层力区间的占比

Table 4 Mean values of support force and their proportions in axial formation force range in key crossing sections of tunnel

编号	名称	支护力/kN	限内占比/%	限上占比/%	限下占比/%
1	右岸大堤段	13034	78	1	21
2	沁河河槽段	15980	32	14	54
3	左岸大堤段	17142	88	12	0

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表 5 隧洞穿越重点段隧洞轴线处地表沉降均值与测点数

Table 5 Mean surface settlements and measuring points at tunnel axis in key crossing sections of tunnel

项目	沉降/mm	测点数
右岸大堤段	2.58	6
沁河河槽段	2.70	13
左岸大堤段	1.31	18

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