Method for calculating settlement amount of soft rock tunnel

A technology of tunnel settlement and calculation method, which is applied in the field of calculation of soft rock tunnel settlement, can solve problems such as spalling of primary support, bulge of side wall, and wide distribution of weak surrounding rock, and achieves good agreement, meets engineering needs, and meets engineering The effect of security needs

Active Publication Date: 2022-04-29
CCCC FIRST HARBOR ENG +1
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Problems solved by technology

[0002] During the construction of mountain tunnels, due to the extremely complex geological conditions, sensitive environment, and fragile ecology, there are a large number of weak surrounding rocks in the tunnel site area. The weak surrounding rocks are widely distributed, the rock mass conditions are poor, the interbed phenomenon is serious, and the interlayer connection is poor. , easy to soften when exposed to water, has obvious anisotropy and rheological characteristics, and because the tunnel is buried deep, it will generate extremely high initial ground stress. Large deformation, the settlement of large deformation is much greater than the reserved settlement, resulting in the peeling of the initial support, bulging of the side wall, and serious encroachment caused by excessive deformation. Under severe encroachment, the initial support must be replaced to ensure the safety of construction personnel and equipment and construction progress have brought very adverse effect

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[0042] In order to make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, but not the whole embodiment. Based on the embodiment of the invention, all other embodiments obtained by ordinary technicians in this field without creative labor belong to the scope of protection of wood inventions.

[0043] In this embodiment, the measured results of cases in Jingzhai Tunnel and Manmushu Tunnel of Yumo Railway with large deformation of soft rock are counted by the method of combining measured statistical analysis with numerical calculation analysis. Through numerical analysis of the influence laws of different influencing factors, combined with the present situation of geolo

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Abstract

The invention discloses a soft rock tunnel settlement calculation method, and relates to the field of railway tunnel construction. Comprising the following steps: determining possible influence factors for calculating the settlement amount of the soft rock tunnel; establishing a database of actually measured tunnel settlement of the soft rock tunnel; key influence factors influencing tunnel settlement calculation are determined; and determining an expression of the maximum value of the settlement of the soft rock tunnel. According to the method, six key influence factors including surrounding rock strength Rb, surrounding rock fracture spacing J, groundwater volume L, deformation grade S, tunnel excavation span B and arch center material inertia moment I which influence the reserved settlement volume of the tunnel are provided, and the single-factor influence rule of the six influence factors on the settlement volume of the soft rock tunnel conforms to actual engineering. The method can be used for calculating the reserved settlement of the unexcavated section of the soft rock tunnel. And the cost waste caused by excessive consumption of materials is reduced.

Description

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Claims

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Application Information

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Owner CCCC FIRST HARBOR ENG
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