Risk assessment in constructing Horseshoe Vault Tunnels using fuzzy technique

Erfan Shafaghat, Mostafa yousefi rad

Abstract



Abstract:

Risk assessment is one of the projects’ important issues and by applying fuzzy method, subsidence possibility can be investigated. In this paper, subsidence has been examined using fuzzy method and investigating 81 and then 6000 soil samples in order to obtain subsidence possibility of soils those which have these features. Results of fuzzy rules in this dissertation have been analyzed about tunnel vault height, the height of the soil, modulus as well as density which can be used in applicable matters. According to the results obtained from this study deformation modulus has the greatest impact on subsidence so that when it is less than 100, soil is not usable more. The higher the slag soil is, the more subsidence is so that from a height of 6 m, the retaining structures must be used. The higher the tunnel vault is, the more the subsidence is and the more the soil density is increasing, subsidence is also increasing. When deformation modulus becomes 100, fuzzy digit is reducing and it stands between 3.8 and 4.2. When slag soil height is increasing, subsidence is more likely to go up. When tunnel vault is from 1 to 4, fuzzy digit stands from 0 to 2.5 and when slag soil density stands between 2200 and 2400, fuzzy digit is between 5 and 6. Risk assessment carried out in fuzzy logic indicates that whenever slag soil height, slag soil density and tunnel vault is increasing, subsidence rate is also going up and whenever deformation modulus is decreasing, subsidence rate is increasing.


Keywords


Key words: Tunnel, Horseshoe, Fuzzy logic, Subsidence

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References


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