| 隧道新型恒阻让压装置的工作机制研究 |
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| 引用本文： | 张传庆,吕浩安,刘小岩,周辉,高阳,闫东明.隧道新型恒阻让压装置的工作机制研究[J].岩土力学,2020,41(12):4045-4053. |
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| 作者姓名： | 张传庆 吕浩安 刘小岩 周辉 高阳 闫东明 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071；
2. 中国科学院大学，北京 100049；3. 浙江大学 建筑工程学院，浙江 杭州 310058 |
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| 基金项目： | 国家自然科学基金?雅砻江联合基金重点项目（No.U1865203）；国家自然科学基金（No.51709257）；湖北省自然科学基金创新群体（No.2018CFA013）。 |
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| 摘 要： | 恒阻让压支护是挤压大变形隧道的大变形控制中较为理想的支护形式，现有技术在高承载力、大变形量及荷载稳定3个方面尚难统一。针对这一难题，受启发于金属拉拔工艺，结合钢拱架支护受力特点，自主研发了拉压转换恒阻让压装置，论述了其工作原理，分析了其力学响应规律与特征，并通过室内试验和数值模拟，对其设计参数的影响规律进行了分析，确定了拉压转换恒阻让压装置性能衡量指标。分析表明：（1）拉压转换恒阻让压装置可在压力条件下恒阻变形，将其安装于钢拱架分段接头处，与钢拱架嵌合为一体，即可保证钢拱架的稳定性，提高钢拱架的大变形适应能力，也可为围岩提供恒定的支护力；（2）基于锥角、摩擦系数、让压杆截面收缩率和直径4个设计参数，该装置可实现让压恒阻力和让压量可控，且其荷载稳定性好，可为软岩隧道大变形及支护稳定控制提供重要技术支撑。
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| 关 键 词： | 让压支护 挤压大变形 恒阻让压装置 数值模拟 |
| 收稿时间： | 2020-04-16 |
| 修稿时间： | 2020-08-10 |
Mechanism research of a new constant resistance yielding device for tunnels |
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| ZHANG Chuan-qing,Lü Hao-an,LIU Xiao-yan,ZHOU Hui,GAO Yang,YAN Dong-ming.Mechanism research of a new constant resistance yielding device for tunnels[J].Rock and Soil Mechanics,2020,41(12):4045-4053. |
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| Authors: | ZHANG Chuan-qing LÜ Hao-an LIU Xiao-yan ZHOU Hui GAO Yang YAN Dong-ming |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China |
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| Abstract: | The constant resistance yielding support is the ideal form of support for squeezing tunnel. Current technology is difficult to satisfy the safety requirements of high bearing capacity, large deformation and load stability at the same time. In response to this problem, the conversion constant resistance yielding device (CCYD) was developed inspired by the metal drawing process in combination with the characteristics of steel arch support. In this paper, the working principle of the CCYD was discussed, and its mechanical response law and characteristics were analyzed. Through the indoor test and numerical simulation, the influence of the design parameters was analyzed, and the performance measurement index of the conversion constant resistance yielding device was determined. The analysis shows that: 1) The conversion constant resistance yielding device can constantly resist deformation under pressure; when installed in the steel arch joint allowing it to be part of the steel arch, the device can ensure the stability of the arch, improve its large deformation adaptability while providing constant support for the surrounding rock. 2) Based on the four design parameters: the cone angle, the friction coefficient, the cross-section shrinkage rate and the diameter of the pressure bar, the device can realize pressure resistance and pressure control with satisfactory load stability, which can provide important technical support for soft-rock tunnel large deformation and the stability control of support. |
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| Keywords: | yielding support squeezing large deformation constant resistance yielding device numerical simulation |
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