基坑开挖引起临近地铁隧道的附加荷载计算方法

doi:10.13722/j.cnki.jrme.2015.1551

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Abstract To consider the influence of the soil unloading stress of the bottom and the surrounding walls by the foundation pit excavation and retaining structure，the mechanics model of foundation pit excavation was established. Based on Mindlin formula，the calculation formula of metro tunnels additional load caused by adjacent foundation pit excavation was derived. And the influence factors were analyzed，such as the foundation pit excavation size and tunnel position and the reinforcement control measures. The calculation results show that：(1) Soil unloading stress of the surrounding walls has a large effect on tunnel when the foundation pit beside tunnels，conversely the influence of soil unloading stress of the bottom is small. However，the influence of soil unloading stress of the bottom will increase when the depth of excavation is shallow. (2) In the horizontal direction to the foundation pit，the pull power on the tunnel is large. But In the vertical direction，the pressure power up or down on the tunnel is small. (3) The change of s，B，d and β will play a largest important role in the stress of tunnels in the horizontal direction. The influence of the change of L is second. And the influence of h is the smallest. (4) The change of d will play the most obviously important role in the stress of tunnels in the vertical direction，then is the change of s，B. The influences of other factors are not obvious.

Key words： foundation engineering excavation of pit foundation tunnel Mindlin solution additional load

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	WEI Gang
	ZHAO Chengli

Cite this article:

WEI Gang,ZHAO Chengli. Calculation method of additional load of adjacent metro tunnels due to foundation pit excavation[J]. , 2016, 35(S1): 3408-3417.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1551 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/3408

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