穿越既有抗滑桩隧道支护结构受力及变形数值分析

王盼; 王怀正; 宋战平; 甘浪菊; 梅舒杰

doi:10.13204/j.gyjzG22081603

穿越既有抗滑桩隧道支护结构受力及变形数值分析

doi: 10.13204/j.gyjzG22081603

王盼¹,
王怀正^2,3, ,,
宋战平^2,3,
甘浪菊¹,
梅舒杰¹

1. 中国水利水电第七工程局有限公司, 成都 611130;
2. 西安建筑科技大学土木工程学院, 西安 710055;
3. 陕西省岩土与地下空间工程重点实验室, 西安 710055

基金项目:

国家自然科学基金项目(52178393)；陕西省创新能力支撑计划创新团队项目(2020TD-005)。

详细信息

作者简介:
王盼,男,1988年出生,学士,工程师,437086155@qq.com。

通讯作者:
王怀正,男,1997年出生,博士研究生,wanghzzy@163.com。

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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-16

Numerical Analysis of Stress and Deformation of Tunnel Supporting Structures Passing Through Existing Anti-Slide Piles

1. Sinohydro Bureau 7 Co., Ltd., Chengdu 611130, China;
2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
3. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an 710055, China

摘要

摘要: 隧道在复杂工况下支护结构受力及变形形式通常较为复杂,尤其在滑坡地段,支护结构处于偏压状态。以攀枝花阳光隧道洞口段为工程依托,探讨在浅埋偏压隧道剪断既有抗滑桩工况下,隧道支护结构的受力及变形特征。利用MIDAS GTS NX数值模拟软件建立三维模型,分析支护结构内力及应力分布规律,预测掘进过程中支护结构的薄弱环节。根据模拟结果可知:管棚支护产生整体位移,最大变形值为35.35 mm;初期支护产生挤压变形,最大变形值为34.36 mm。支护结构左拱腰处受应力集中影响内力较大,临时支护拆除对拱顶及仰拱处应力影响较大。监测数据表明:围岩压力分布不均,拱顶处接触压力最大,支护结构右侧压力大于左侧,最大压力值为268.60 kPa。
- 隧道工程 /
- 数值模拟 /
- 抗滑桩 /
- 支护结构
Abstract: The force and deformation forms of the supporting structure of tunnels are usually complicated in complex conditions. Especially in the landslide area, the supporting structure is in a eccentrically compressive state. Based on the entrance section of Sunshine Tunnel in Panzhihua, the force and deformation characteristics of the supporting structure of tunnels in the condition of existing anti-slide piles cut off by shallowly burized tunnels were studied. A three-dimensional model was constructed by the numerical simulation software MIDAS GTS NX to analyze the internal forces and stress in the supporting structure and predict the weakness of the supporting structure in the tunnelling process. According to the simulation results, the shed-pipe support produced overall displacement, and the maximum deformation was 35.35 mm. The initial support produced extrusion deformation, and the maximum deformation was 34.36 mm. The internal force in the left arch waist of the supporting structure was larger due to stress concentration, while the removal of temporary supports had a greater impact on the stress at the vault and invert. The monitored data showed that the pressure in surrounding rock was uneven, and the contact pressure at the vault was largest. The pressure on the right side of the supporting structure was greater than that on the left side, and the maximum pressure was 268.60 kPa.
- tunnel engineering /
- numerical simulation /
- anti-slide pile /
- supporting structure

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