Unified boundary determination method of pressure arch in tunnels and its spatial evolution characteristics

doi:10.16265/j.cnki.issn1003-3033.2022.08.1638

Abstract

Abstract:

In order to analyse stability of surrounding rock after tunnel excavation, firstly, differences and similarities of inner and outer boundaries of pressure arch under different methods were investigated, and a unified method to determine arch boundaries was defined. Then, influence of different excavation methods on pressure arch was compared. Finally, a method to determine boundaries of three-dimensional pressure arch of the tunnel was proposed and evolution characteristics and shape of the arch were obtained under different excavation steps. The result shows as excavation step progresses, pressure arch gradually expands, which will be the smallest for Center Diaphragm(CD) method. The three-dimensional pressure arch range is smaller than that of two-dimensional one, and its shape gradually changes from a small trumpet due to spatial constraints of the tunnel face, while its height and width also gradually increase. During tunnel construction, segment process control can be achieved by adopting subsection excavation method, and space constraint of the tunnel face can be utilized to ensure safe construction.

Key words: tunnel, pressure arch, boundary determination method, spatial evolution characteristics, construction safety

AN Yonglin, LI Jiahao, LIU Wenjuan, ZHOU Jin, TAN Geyu. Unified boundary determination method of pressure arch in tunnels and its spatial evolution characteristics[J]. China Safety Science Journal, 2022, 32(8): 84-90.

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文献序号	内边界			外边界
文献序号	拱顶	拱腰	拱底	拱顶	拱腰	拱底
[6]	切向应力最大值处	最大主压应力最大值处	最大主压应力最大值处	以最大主压应力减少量确定	以最大主压应力减少量确定	以最大主压应力减少量确定
[8]	—	—	—	切向应力与径向应力交点处	切向应力与径向应力交点处	切向应力与径向应力交点处
[14]	—	—	—	成拱系数(应力差值比)减小至5%	应力差值比减小到5%处	应力差值比减小到5%处
[4]	最大主压应力最大值处	—	—	切向应力与径向应力交点处	—	—
[5]	切向应力为原岩应力处	最大主压应力矢量流线延伸	—	切向应力与径向应力交点处	最大主压应力矢量流线延伸	最大主压应力矢量流线延伸
[13]	切向应力为原岩应力处	—	—	应力差值比曲线的驻点	—	—
[7]	未区别压力拱内边界与外边界的概念			切向应力与径向应力交点处	—	—

内外边界距隧道轮廓距离/m		拱顶路径		拱腰路径		拱底路径
内外边界距隧道轮廓距离/m		内边界	外边界	内边界	外边界	内边界	外边界
全断面法		3.6	51	0	24	8.2	33.2
台阶法	上台阶	3.2	50.5	0	23	8.6	32.3
台阶法	下台阶	3.5	51	0	23.4	5.8	33
CD法	右上导坑	2.1	36.8	0	14.3	5	21.9
	右下导坑	2.6	37.1	0	15	3.1	22.7
	左上导坑	4	49	0	22.9	7.4	30.9
	左下导坑	3.4	49.5	0	23.2	8.2	32.8