| 考虑土拱效应的管棚合理间距计算方法 |
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| 引用本文： | 陈峥,何平,颜杜民,高红杰.考虑土拱效应的管棚合理间距计算方法[J].岩土力学,2019,40(5):1993-2000. |
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| 作者姓名： | 陈峥 何平 颜杜民 高红杰 |
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| 作者单位： | 1. 北京交通大学 隧道及地下工程教育部工程研究中心，北京 100044；2. 中铁十二局集团第三工程有限公司，山西 太原 030024 |
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| 基金项目： | 国家重点研发计划资助项目（No. 2017YFC0805401）；北京交通大学横向科研项目（No. C15L00550）。 |
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| 摘 要： | 管棚作为隧道安全穿越不良地质地段的超前支护结构，依靠土拱效应发挥其支护作用，管棚间距与成拱效应密切相关。通过引入合理拱轴线，并考虑侧向土压力的影响，结合管棚间土拱破坏条件给出了管棚合理间距的计算方法，通过凤咀江隧道工程实例和离散元对比分析，验证了计算方法的合理性。进一步分析了管棚间距随管棚所处位置的变化规律以及管棚直径、土体参数等对管棚间距的影响规律。结果表明：当侧向土压力系数较小时，拱腰至边墙处管棚间距可适当调大；当侧向土压力系数较大时，拱顶至拱腰处管棚间距应适当减小。管棚间距随管棚直径和土体黏聚力的增加而线性增加，且与土体内摩擦角数呈正相关关系，随内摩擦角增大，对管棚间距的影响也越来越大。
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| 关 键 词： | 管棚 土拱效应 管棚间距 离散元 |
| 收稿时间： | 2018-07-13 |
A method to calculate rational spacing between pipes in pipe roofs considering soil arching effects |
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| CHEN Zheng,HE Ping,YAN Du-min,GAO Hong-jie.A method to calculate rational spacing between pipes in pipe roofs considering soil arching effects[J].Rock and Soil Mechanics,2019,40(5):1993-2000. |
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| Authors: | CHEN Zheng HE Ping YAN Du-min GAO Hong-jie |
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| Institution: | 1. Tunneling and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. The 3th Engineering Co., Ltd. of China Railway 12th Bureau Group, Taiyuan, Shanxi 030024, China |
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| Abstract: | As an advanced supporting structure of the tunnel safely passing through unfavorable geological areas, the pipe roof play its supporting role depending on the soil arch effect. The pipe roof spacing is closely related to the arching effect. In this paper, a method of calculating the rational spacing of pipe roof is developed by introducing rational arch axis, considering the effect of lateral earth pressure, and combining with failure conditions of soil arching. The rationality of the proposed method is verified through the case study of Fengjujiang tunnel and comparing with the result of discrete element method. Furthermore, the variation of pipe roof spacing with the location of pipe roof and the influence of pipe roof diameter and soil parameters on pipe roof spacing are analyzed. The results show that when the lateral earth pressure coefficient is low, the spacing between the hance and the side wall can be increased appropriately. However, when lateral earth pressure coefficient is high, the pipe roof spacing from vault to hance needs to be decreased appropriately. Pipe roof spacing increases linearly with the increase of pipe roof diameter and soil cohesion, and is positively correlated with the friction angles in soil. With the increase of internal friction angle, the influence of pipe roof spacing is also increasing. |
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| Keywords: | pipe roof soil arching effects pipe roof spacing discrete element |
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