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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (11): 1765-1771.DOI: 10.3973/j.issn.2096-4498.2018.11.002

• 研究与探索 • 上一篇    下一篇

高填矩形、拱形截面明洞土压力差异性规律研究

王焕1, 李盛2   

  1. (1. 中铁十四局集团有限公司, 山东济南 250014; 2. 兰州交通大学土木工程学院, 甘肃兰州 730070)
  • 收稿日期:2018-01-15 修回日期:2018-07-03 出版日期:2018-11-20 发布日期:2018-12-02
  • 作者简介:王焕(1964—),男,山东蒙阴人,1985年毕业于石家庄铁道学院,铁道建筑专业,硕士,教授级高级工程师,主要从事桥梁与隧道方面的研究与企业管理工作。Email: gcjsb1901@163.com。
  • 基金资助:

    国家自然科学基金资助项目(51668036); 甘肃省高等学校科学研究一般项目(2017A-111)

Study of Difference Laws of Earth Pressure between Highfilled Opencut Tunnels with Rectangular and Arched Crosssection

WANG Huan1, LI Sheng2   

  1. (1. China Railway 14th Bureau Group Co., Ltd., Jinan 250014, Shandong, China; 2. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China)
  • Received:2018-01-15 Revised:2018-07-03 Online:2018-11-20 Published:2018-12-02

摘要:

为了得到矩形、拱形截面明洞土压力随填土高度的变化规律,采用模型试验与数值模拟相结合的方法进行研究,得到以下结果: 1)截面形式对明洞土压力大小影响很大,且基础刚度不同,差异性明显。拱形截面明洞洞顶轴线处竖向土压力大于矩形截面明洞。2)刚性基础拱形截面明洞洞顶同一平面竖向土压力变化呈减小—平缓的趋势,而柔性基础呈减小—增大—平缓的趋势; 矩形截面明洞呈增大—减小—平缓的趋势。3)刚性基础明洞洞顶同一平面水平土压力分布形式呈现出2个拱形,而柔性基础明洞仅在洞顶上方出现1个拱形。4)刚性基础拱形、矩形截面明洞洞顶至0.6倍洞高范围内土体位移分别呈“W”、“双V”形分布,0.6~3倍洞高内均呈“V”形分布,3倍洞高以上无相对沉降,而柔性基础明洞土体位移在0~3倍洞高内均为“V”形,3倍洞高以上无相对沉降。

关键词: 高填明洞, 隧道截面形式, 差异性规律, 土压力, 位移, 基础刚度

Abstract:

The model test and numerical simulation are adopted to study the variation rule of earth pressure of rectangular and arched opencut tunnels with filling height. The results obtained include: (1) The tunnel crosssection form has a great influence on earth pressure, and the influence varies under different foundation stiffnesses. The vertical earth pressure on the top axis of opencut tunnel with arched crosssection is greater than that of opencut tunnel with rectangular crosssection. (2) The variations of conplane vertical earth pressures of arched opencut tunnel with rigid foundation and flexible foundation present a decreasinggentle trend and a decreasingincreasinggentle trend, respectively; and that of rectangular opencut tunnel presents an increasingdecreasinggentle trend. (3) Two arches are presented as the distribution forms of the conplane horizontal earth pressures of opencut tunnel with rigid foundation, while only one arch is appeared above the top of opencut tunnel with flexible foundation. (4) The soil displacements of rectangular and arched opencut tunnels with rigid foundation present a W shape and a dualV shape from the top to 0.6 times tunnel height, respectively; they present a V shape in the range of 0.6 to 3 times tunnel height, and no relative settlement occurs above 3 times tunnel height; the soil displacements of rectangular and arched opencut tunnels with flexible foundation present a V shape in the range of 0 to 3 times tunnel height, and no relative settlement occurs above 3 times tunnel height.

Key words: highfilled opencut tunnel, tunnel crosssection form, difference law, earth pressure, displacement, foundation stiffness

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