Calculation method and influencing factors for earth pressure of high fill open-cut tunnel

被引：4

作者：

Li S. ^{[1
,2
]}

Ma L. ^{[3
]}

Wang Q. ^{[1
,2
]}

Li J. ^{[1
,2
]}

Li W. ^{[1
,2
]}

Zhang Y. ^{[1
,2
]}

机构：

[1] National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu

[2] Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu

[3] College of Civil Engineering, Lanzhou Institute of Technology, Lanzhou, 730050, Gansu

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2016年 / 37卷 / 05期

关键词：

Concentration factor of earth pressure; Earth pressure; Height of equal settlement section; High fill open-cut tunnel; Rock-soil mechanics;

D O I：

10.3969/j.issn.1001-4632.2016.05.06

中图分类号：

学科分类号：

摘要：

Based on rock and soil mechanics principle, considering slope angle, trench width and other factors, a calculation model for the earth pressure of high fill open-cut tunnel was established and the calculation formula was derived for the earth pressure on top of open-cut tunnel. The correctness of the calculation method was validated by numerical simulation and field test results. According to the calculation method, sensitivity analysis was performed to further study parameters affecting the concentration factor of earth pressure, such as slope angle, the properties of filling material, the depth-width ratio of open-cut tunnel as well as the width ratio of open-cut tunnel and trench. Results show that the height of equal settlement section decreases with the increase of filling height; it increases first and then decreases with the increase of slope angle; it increases with the increase of the depth-width ratio of open-cut tunnel as well as the width ratio between trench and open-cut tunnel. The concentration factor of earth pressure on top of open-cut tunnel increases first and then decreases with filling height. The increase in slope angle is helpful to reduce the earth pressure on top of open-cut tunnel. The increase in the depth-width ratio of open-cut tunnel as well as the width ratio of open-cut tunnel and trench will cause serious concentration phenomenon of earth pressure on top of open-cut tunnel. Consequently, on the premise of ensuring the slope stability and structure safety in practical engineering, try to improve the slope angle, decrease the width of filling trench and reduce the depth-width ratio of open-cut tunnel. © 2016, Editorial Department of China Railway Science. All right reserved.

引用

页码：41 / 49

页数：8

共 18 条

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