黄土地层含水率增大对大跨度隧道围岩压力影响

朱才辉; 贺豪楠; 兰开江; 李玉波

doi:10.11779/CJGE2021S1017

黄土地层含水率增大对大跨度隧道围岩压力影响 English Version

朱才辉^{1, 2,},
贺豪楠^{1, 2},
兰开江^{1, 2},
李玉波³

1.
西安理工大学省部共建西北旱区生态水利国家重点试验室,陕西　西安　710048
2.
西安理工大学岩土工程研究所,陕西　西安　710048
3.
中铁第一勘察设计院集团有限公司,陕西　西安　710043

基金项目:

西安理工大学省部共建西北旱区生态水利国家重点试验室项目 2019KJCXTD-12

国家自然科学基金项目 51678484

陕西省自然科学基金项目 2019JLP-22

详细信息

作者简介:
朱才辉（1983— ）,男,陕西商南人,博士,2012年博士毕业于西安理工大学岩土工程专业,现任副教授,主要从事黄土力学与工程等方面的教学与研究工作。E-mail：zhucaihui123@163.com

中图分类号: TU43
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出版历程
- 收稿日期: 2021-12-14
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-06-30

Influences of increase of moisture content on surrounding soil pressure of large-span tunnels in loess

ZHU Cai-hui^{1, 2,},
HE Hao-nan^{1, 2},
LAN Kai-jiang^{1, 2},
LI Yu-bo³

1.
State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
2.
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China
3.
China Railway First Survey and Design Institute Group.Co., Ltd., Xi'an 710043, China

摘要

摘要: 以某黄土公路隧道为背景,通过室内常规三轴试验来获取原状Q₂黄土的物理力学参数,并基于数值分析方法探讨因地表水分入渗或地下水位抬升引起的洞周围岩压力的变化规律,并提出考虑含水率影响的修正围岩压力算法。结果表明：①随着地表水入渗深度或地下水位抬升高度的增大,围岩压力呈增大趋势,且最大围岩压力比ψ_max=1.1~3.5,最大收敛变形比ζ_max=1.1~1.3;②初始含水率越低,其最大围岩压力比和收敛变形比越大,因地表水分入渗或水位抬升引起的围压放大效应越明显；③隧道埋深越浅,围岩压力分布越不均匀,“猫耳朵”形状越明显,埋深越大围岩压力分布相对均匀；④引入围岩压力比,提出了半数值半经验的修正隧道围岩压力计算公式,可考虑因黄土地层含水率增大引起的围岩压力放大效应。
- 黄土地层 /
- 隧道 /
- 围岩压力 /
- 含水率 /
- 分布模式
Abstract: Based on a highway tunnel in loess, the triaxial tests under different moisture contents of undisturbed Q₂ loess are conducted to obtain the physical and mechanical parameters, and the numerical method is used to analyze the variation laws of surrounding earth pressure(SEP)under the infiltration of surface water or rising of underground water level.The modified methods for SEP are put forward by considering the effects of moisture content.The results show that:(1)With the increase of rising height of underground water level and the infiltration depth, the SEP exhibits a trend of increase, and the largest SEP ratio ψ_max=1.1~3.5, the largest surrounding earth convergence deformation ratio ζ_max=1.1~1.3.(2)The lower the initial moisture content of the loess stratum, the greater the maximum SEP ratio and convergence deformation ratio, and the more obvious the SEP amplification effect caused by water infiltration or rising of water level.(3)The shallower the buried depth of tunnel is, the more uneven the SEP distribution is, the more obvious the shape of "cat's ear" is, and the more evenly the SEP distribution is.(4)By introducing the SEP ratio, a semi-numerical and semi-empirical formula for calculating the SEP of the tunnel is put forward, and the amplification effect of SEP caused by the increase of moisture content of loess can be considered.
- loess stratum /
- tunnel /
- surrounding earth pressure /
- moisture content /
- distribution mode

HTML全文

图 1 黄土地层隧道受周边水环境影响示意图

Figure 1. Water environment around loess tunnel

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图 2 黄土隧道地表水入渗模型

Figure 2. FEM of loess tunnel during water infiltration

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图 3 地表水入渗期间洞周围岩应力及变形演化规律

Figure 3. Variation laws of surrounding earth pressure and displacement during water infiltration

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图 4 地下水位抬升数值分析模型

Figure 4. FEM of loess tunnel during rising of groundwater level

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图 5 地下水恢复期间洞周围岩应力及变形演化规律

Figure 5. Variation laws of surrounding earth pressure and displacement during rising of water level

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表 1 原状Q₂黄土物理指标

Table 1 Physical indexes of undisturbed Q₂ loess

ρ/(g·cm^-3)	G_s	w₀/%	塑限w_p/%	液限w_l/%
1.71~1.95	2.72~2.73	18.3~21.5	19.5~20.4	28.5~30.0
注：w₀为天然含水率,ρ为天然密度,w_p为塑限,w_l为液限。

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表 2 不同含水状态下Q₂原状黄土力学参数

Table 2 Parameters of Q₂ loess under different moisture contents

w/%	E/MPa	v	c/kPa	φ/(°)	γ/(kN·m^-3)
8	72.2	0.35	43.5	25.9	17.1
14	46.8	0.35	36.5	24.7	18.1
20	44.1	0.36	29.5	23.5	19.0
26	38.6	0.37	22.5	22.3	20.0
31	33.2	0.38	5.1	19.3	22.3
注：w为含水率,E为弹性模量,v为泊松比,c为内聚力,φ为内摩擦角,γ为重度。

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表 3 数值分析计算参数

Table 3 Parameters of numerical analysis

土层	γ/(kN·m^-3)	E/GPa	泊松比v	厚度/m
基岩	26	1.5	0.26	20
初期支护	24	25.5	0.22	0.30
二衬	25	28.5	0.20	0.60

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