超载作用下土岩复合地层盾构隧道变形及破坏特征模型试验研究

张晏铭; 刘庭金; 朱超; 肖俊贤

doi:10.19713/j.cnki.43-1423/u.T20222174

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超载作用下土岩复合地层盾构隧道变形及破坏特征模型试验研究

桥梁隧道与结构 | 更新时间：2023-12-05

- 超载作用下土岩复合地层盾构隧道变形及破坏特征模型试验研究
- Model tests on deformation and failure characteristics of shield tunnel in soil-rock composite stratum under surface surcharge
- 铁道科学与工程学报 2023年20卷第11期页码：4277-4287
- 作者机构：
  
  1.华南理工大学土木与交通学院，广东广州 510641
  2.华南理工大学亚热带建筑科学国家重点实验室，广东广州 510640
- 作者简介：
  
  刘庭金(1976—)，男，江西赣州人，教授，博士，从事地铁结构安全评估和保护技术研究；E-mail：Liu_tingjin@163.com
- 基金信息：
  
  国家自然科学基金资助项目(51878296);广东省自然科学基金面上项目(2023A1515012084)
- DOI：10.19713/j.cnki.43-1423/u.T20222174
  中图分类号：
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张晏铭,刘庭金,朱超等.超载作用下土岩复合地层盾构隧道变形及破坏特征模型试验研究[J].铁道科学与工程学报,2023,20(11):4277-4287.

ZHANG Yanming,LIU Tingjin,ZHU Chao,et al.Model tests on deformation and failure characteristics of shield tunnel in soil-rock composite stratum under surface surcharge[J].Journal of Railway Science and Engineering,2023,20(11):4277-4287.
张晏铭,刘庭金,朱超等.超载作用下土岩复合地层盾构隧道变形及破坏特征模型试验研究[J].铁道科学与工程学报,2023,20(11):4277-4287. DOI： 10.19713/j.cnki.43-1423/u.T20222174.

ZHANG Yanming,LIU Tingjin,ZHU Chao,et al.Model tests on deformation and failure characteristics of shield tunnel in soil-rock composite stratum under surface surcharge[J].Journal of Railway Science and Engineering,2023,20(11):4277-4287. DOI： 10.19713/j.cnki.43-1423/u.T20222174.

摘要

地面突发堆载诱发运营期内地铁隧道病害的案例屡见不鲜，广州地区地铁隧道建设中常遇洞身上部为软土、砂层，下部为硬岩的土岩复合地层。目前对于局部超载作用下，土岩复合地层中盾构隧道变形与破坏特征并不明确，现行加固标准对于该种特殊地层的适用性也亟待验证。通过1︰5的土箱模型试验，探究不同硬岩比的土岩复合地层中隧道在正上方局部超载作用下的变形规律和破坏模式。试验结果表明：地层硬岩比对局部超载下盾构隧道的位移发展及其分布影响显著，结构的临界失稳荷载等级随着硬岩比增大而提高，结构破坏椭圆度随之减小，硬岩比的增大加强了结构外部围岩的约束作用，显著地控制了隧道椭变，但约束的加强也使结构呈现脆性性状，位移发展速率出现明显突变点；硬岩限制了其范围内管片的内力发展，且土岩交界面上部邻域管片产生应力集中现象，结构首先在此区域发生破坏，且常以贯穿式裂缝形式发展，随着硬岩比增大，结构呈崩角、劈裂等脆性破坏形式；隧道拱顶附加土压力会随结构失稳进入下降阶段，且随着硬岩比增大，软土压缩对地表超载的分散效应减弱，进而导致隧道拱顶附加土压力对地表超载更加敏感；将试验数据与现行加固标准对比分析，发现现行加固标准不适用于高硬岩比土岩复合地层中盾构隧道。研究成果可为加固标准结合地层因素优化提供理论支撑。

Abstract

Cases of metro tunnel damage induced by sudden surface surcharge during the operation period are commonly seen, and the construction of metro tunnels in Guangzhou often encounters soil-rock composite strata with soft soil or sand layers on the upper part of the hole and hard rock on the lower part. At present, the deformation and failure characteristics of shield tunnels in soil-rock composite strata under local surcharge were unclear. The applicability of current strengthening specification to this special stratum was still to be verified. The mechanical properties and failure modes of tunnels in soil-rock composite strata with different hard rock ratios under local surcharge were investigated by a 1:5 soil box model test. The results of the tests showed that the hard rock ratio of the strata had significant effects on the development and distribution of the displacement of the shield tunnel under local surcharge. The critical instability load level of the structure raised with the increase of hard rock ratio, while the failure ellipticity of the structure decreased. The increase of the hard rock ratio strengthened the integral stiffness of the structure, which significantly controlled the tunnel ellipticity, whereas the enhancement of stiffness also led to the brittle properties of the structure as well as the distinct inflection point of displacement development rate. The internal force development of the segment was restricted by the hard rock, and the stress concentration phenomenon occurred in the segment in the area adjacent to the upper area of the soil-rock interface. The structure was first destructed in this area, which generally manifested as the development of cracks in the form of penetration, and with the increase of hard rock ratio. The structure was in the form of brittle failure such as corner collapse and fracture. The pressure of the additional earth at the top of the tunnel arch would enter a decreasing phase in response to the instability of the structure, and with the increase of hard rock ratio, the effect of the soil-rock interface to limit the soil pressure diffusion became more significant, which led to the additional earth pressure in the tunnel vault became more sensitive to the surface surcharge. The experimental data are compared and analyzed with the current strengthening specifications, and it is found that the current strengthening specifications are not applicable to the strengthening of tunnels in soil-rock composite strata with a high hard rock ratio. The research results can provide theoretical support for the optimization of current specifications combined with stratigraphic factors.

关键词

局部超载土岩复合地层盾构隧道硬岩比模型试验失稳

Keywords

local surchargesoil-rock composite stratumshield tunnelhard rock ratiomodel testfailure

references

王如路, 张冬梅. 超载作用下软土盾构隧道横向变形机理及控制指标研究[J]. 岩土工程学报, 2013, 35(6): 1092-1101.

WANG Rulu, ZHANG Dongmei. Mechanism of transverse deformation and assessment index for shield tunnels in soft clay under surface surcharge[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(6): 1092-1101.

HUANG Hongwei, SHAO Hua, ZHANG Dongming, et al. Deformational responses of operated shield tunnel to extreme surcharge: a case study[J]. Structure and Infrastructure Engineering, 2017, 13(3): 345-360.

刘庭金, 陈思威, 叶振威. 堆载诱发盾构隧道病害及结构安全分析[J]. 铁道工程学报, 2019, 36(11): 67-73.

LIU Tingjin, CHEN Siwei, YE Zhenwei. Analysis of disease and structural safety of shield tunnel under accidental surface surcharge[J]. Journal of Railway Engineering Society, 2019, 36(11): 67-73.

SHARMA J S, HEFNY A M, ZHAO J, et al. Effect of large excavation on deformation of adjacent MRT tunnels[J]. Tunnelling and Underground Space Technology, 2001, 16(2): 93-98.

DOLEŽALOVÁ M. Tunnel complex unloaded by a deep excavation[J]. Computers and Geotechnics, 2001, 28(6/7): 469-493.

魏新江, 洪文强, 魏纲, 等. 堆载引起临近地铁隧道的转动与错台变形计算[J]. 岩石力学与工程学报, 2018, 37(5): 1281-1289.

WEI Xinjiang, HONG Wenqiang, WEI Gang, et al. Rotation and shearing dislocation deformation of subway tunnels due to adjacent ground stack load[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(5): 1281-1289.

LIU Xian, BAI Yun, YUAN Yong, et al. Experimental investigation of the ultimate bearing capacity of continuously jointed segmental tunnel linings[J]. Structure and Infrastructure Engineering, 2016, 12(10): 1364-1379.

赖浩然, 黄常元, 刘学增, 等. 超载对淤泥质地层隧道结构受力性能影响分析: 以苏通GIL综合管廊越江盾构隧道为例[J]. 现代隧道技术, 2018, 55(5): 88-96.

LAI Haoran, HUANG Changyuan, LIU Xuezeng, et al. Analysis on the effects of overloading on the mechanical properties of tunnel structures in the silty ground—a case study of sutong river-crossing GIL utility tunnel[J]. Modern Tunnelling Technology, 2018, 55(5): 88-96.

CUI Ge, CUI Jian, FANG Yong, et al. Scaled model tests on segmental linings of shield tunnels under earth and water pressures[J]. International Journal of Physical Modelling in Geotechnics, 2019: 1-17.

YANG Feng, ZHENG Xiangcou, ZHANG Jian, et al. Upper bound analysis of stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils[J]. Tunnelling and Underground Space Technology, 2017, 61: 150-160.

HUANG Hongwei, ZHANG Dongming. Resilience analysis of shield tunnel lining under extreme surcharge: characterization and field application[J]. Tunnelling and Underground Space Technology, 2016, 51: 301-312.

黄大维, 周顺华, 赖国泉, 等. 地表超载作用下盾构隧道劣化机理与特性[J]. 岩土工程学报, 2017, 39(7): 1173-1181.

HUANG Dawei, ZHOU Shunhua, LAI Guoquan, et al. Mechanisms and characteristics for deterioration of shield tunnels under surface surcharge[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(7): 1173-1181.

梁发云, 方衍其, 袁强, 等. 软、硬地层中局部堆载对隧道横向变形影响的试验研究[J]. 同济大学学报(自然科学版), 2021, 49(3): 322-331.

LIANG Fayun, FANG Yanqi, YUAN Qiang, et al. Experimental study of the influence of surface surcharge on tunnel lateral deformation in soft and hard soil[J]. Journal of Tongji University (Natural Science), 2021, 49(3): 322-331.

魏纲, 张书鸣, 余剑英, 等. 地面堆载对盾构隧道围压影响的模型试验与理论分析[J]. 岩土工程学报, 2022, 44(10): 1789-1798.

WEI Gang, ZHANG Shuming, YU Jianying, et al. Model test and theoretical analysis of the influence of ground surcharge on confining pressure of shield tunnel[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1789-1798.

刘学增, 赖浩然, 桑运龙, 等. 不同变形条件下盾构隧道粘钢加固效果的模型试验研究[J]. 岩土工程学报, 2020, 42(11): 2115-2123.

LIU Xuezeng, LAI Haoran, SANG Yunlong, et al. Model tests on effect of bonded steel plate reinforcement of shield tunnels under different deformation conditions[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(11): 2115-2123.

陈浅然. 大直径盾构隧道非一致激励作用下的大型振动台试验研究[D]. 广州: 广州大学, 2020.

CHEN Qianran. Research of shaking table test for large-scale shield tunnel under non-uniform ground motion excitation[D]. Guangzhou: Guangzhou University, 2020.

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