考虑透水效应的泥石流柔性防护网耦合分析方法

余志祥; 骆泓锦; 张丽君; 骆丽茹; 金云涛; 赵雷

doi:10.11779/CJGE20230517

考虑透水效应的泥石流柔性防护网耦合分析方法 English Version

余志祥^{1, 2, 3,},
骆泓锦¹,
张丽君^{1, 3},
骆丽茹^{1, 3},
金云涛^{1, 3},
赵雷^{1, 3}

1.
西南交通大学土木工程学院, 四川成都 610031
2.
西南交通大学陆地交通地质灾害防治技术国家工程研究中心, 四川成都 611756
3.
西南交通大学防护结构研究中心, 四川成都 610031

基金项目:

四川省科技计划项目重点研发项目 2022YFG0141

交通运输行业重点科技项目 2020-MS3-101

国家重点研发计划项目 2018YFC1505405

详细信息

作者简介:
余志祥(1976—)，男，博士，教授，主要从事防灾减灾与防护工程方面的教学与研究工作。E-mail：yzxzrq@home.swjtu.edu.cn

中图分类号: TU449;X43
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出版历程
- 收稿日期: 2023-06-06
- 网络出版日期: 2023-11-29
- 刊出日期: 2024-07-31

Coupling analysis method for flexible debris flow barriers considering water blocking and permeability effects

YU Zhixiang^{1, 2, 3,},
LUO Hongjin¹,
ZHANG Lijun^{1, 3},
LUO Liru^{1, 3},
JIN Yuntao^{1, 3},
ZHAO Lei^{1, 3}

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
National Engineering Laboratory for Prevention and Control of Geological Disasters in Land Transportation, Southwest Jiaotong University, Chengdu 611756, China
3.
Research Center for Protection Structures Against Natural Hazards, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 针对柔性防护网在黏性泥石流通过时的透水效应问题，在柔性环连网等效薄膜有限单元(FEM)的基础上，结合S-ALE和Ergun公式的欧拉-拉格朗日耦合算法，提出了Structured-ALE-FEM耦合算法（简称S-A-F方法），实现了考虑透水效应的泥石流柔性防护网耦合分析。结合USGS的泥石流柔性防护模型试验，开展了泥石流柔性防护全过程动力学分析，并与试验结果进行了对比分析。研究表明：提出的耦合方法可再现泥石流冲击、爬高及渗透堆积的全过程；与试验相比，泥石流堆积高度和堆积宽度的最大误差分别为11.9%和10.3%，泥石流浆体通过量最大差量为3.2%；柔性防护网关键部件动力响应与试验相比，右侧拉锚绳、左侧拉锚绳及网片最大变形量时程曲线误差分别为3.2%，16.4%，14.4%。与不考虑阻水效应的两种理论算法相比，S-A-F方法在泥石流冲击力峰值和泥石流浆体通过量准确度较同类其他方法提升了4.69%和17.50%。提出的S-A-F耦合方法可用于黏性泥石流柔性防护工程的设计计算。
- 泥石流 /
- 柔性防护网 /
- S-ALE /
- 薄膜等效 /
- 透水
Abstract: To solve the dynamic effects of blocking and permeating water under the scouring effects of mudflow on flexible protection projects, a coupled S-ALE-FEM method considering the water blocking and permeability effects of mudflow flexible protection process is established. The equivalent thin film unit of the ring network considering the water-blocking-permeability effects is established according to the Euler-Lagrange coupling algorithm based on S-ALE and Ergun formula to realize the equivalent water-blocking-permeability quantification calculation of the dense curved beam-like metal ring network mudslide protection process. The kinetic analysis of the whole process of mudflow flexible protection is carried out in conjunction with the USGS mudflow flexible protection model tests, and the results are compared with the test ones. The study shows that the proposed coupled method can reproduce the full process inversion of debris flow impact, height climbing and infiltration accumulation. Compared with those of the tests, the maximum errors of debris flow accumulation height and accumulation width are 11.9% and 10.3%, respectively, and the maximum difference of debris flow slurry passage is 3.2%. For comparison between the tests and the dynamic response of key components of the flexible protection system, the maximum time-history errors of right side anchor rope, left side anchor rope and mesh are 3.2%, 16.4% and 14.4% respectively. Compared with those of the two theoretical algorithms not considering the water blocking effects, the accuracy of the calculated results of the peak debris flow impact force and the difference of debris flow slurry passage are improved by 4.69% and 17.50%, respectively. The S-A-F coupling method can solve the design and calculation challenges of mudflow flexible protection projects.
- debris flow /
- flexible barrier /
- S-ALE /
- equivalent membrane /
- permeating water

HTML全文

图 1 泥石流柔性防护网拦截泥石流

Figure 1. Interception of debris flow by debris flow flexible barriers

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图 2 柔性防护网透水薄膜等效模型

Figure 2. Equivalent model for water permeable membrane of flexible barriers

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图 3 透水薄膜单元等效示意

Figure 3. Equivalent representation of water permeable membrane element

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图 4 S-A-F耦合原理

Figure 4. Coupling principle of S-A-F

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图 5 S-A-F耦合计算流程

Figure 5. Coupled computing flow of S-A-F

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图 6 透水膜等效环网示意

Figure 6. Representation of equivalent ring network of water permeable membrane

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图 7 试验模型与数值模型对比

Figure 7. Comparison of experimental and numerical models

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图 8 数值模型与试验冲击过程对比^[23]

Figure 8. Comparison of numerical model process and experimental impact process^[23]

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图 9 试验与数值模型对比分析

Figure 9. Comparative analysis of experimental and numerical models

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表 1 泥石流及S-A-F耦合参数设置

Table 1 Parameter setting of debris flow and S-A-F coupling

多孔介质的当量直径D_p/m	黏聚力c/kPa	泥石流初始冲击速度 $v_{\text{f}}^{\text{0}}$ /(m·s^-1)	动力黏度系数 $\mu$	惯性阻力系数b(ρ, ε)	黏性阻力系数a(μ, ε)	网片结构初速度 $v_{\text{s}}^{\text{0}}$ /(m·s^-1)
0.002	1	10	0.001	1.23×10⁷	2.10×10⁵	0

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表 2 不同文献泥石流冲击力峰值及浆体通过量误差对比

Table 2 Comparison of peak mudflow impact force and slurry throughput error in different literature

数据来源	冲击力峰值/kN	误差/ %	浆体最大通过量/%	浆体通过量最大差值/%
试验	81.09	—	4.90	—
本文	75.33	5.76	8.10	3.20
Hungr等^[10]	72.90	10.10	25.60	20.70
Tan等^[24]	72.62	10.45	20.41	15.51

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