Journal
JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES
Volume 34, Issue 3, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)CF.1943-5509.0001421
Keywords
Improved cloud model; Risk assessment of tunnel construction; Risk index system; Reverse cloud generator; Forward cloud generator
Funding
- National Natural Science Foundation of China [51679131, 51709159, 41672281]
- Key Research and Development Project of Shandong Province [2017GSF220014, 2019GSF111030]
- Fundamental Research Funds of Shandong University [2017JC001]
- CRSRI Open Research Program [SN: CKWV2018468/KY]
- Ministry of Science and Technology [MDPC201802]
- Education Commission Science and Technology research project of Chongqing [KJ1712304]
- State Key Laboratory of Mining Disaster Prevention and Control - Shandong Province
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Objective and scientific risk assessment is of great significance for tunnel construction. The intrinsic link between risk level and influencing factors are poorly understood, and our ability to assess the risks of tunnel construction remains limited. In this study, we improved the normal cloud model to combine fuzziness and randomness into risk assessment to make the result more accurate. First, we constructed the risk index system for tunnel construction; second, we calculated the weight of the risk index by using the AHP method. Then we determined the improved cloud model eigenvalue through investigation and analysis and put the risk index data into a forward cloud generator to obtain the fuzzy comprehensive evaluation matrix. Following this, we combined weights with the matrix to receive the membership degree of different risk levels. Finally, the final risk level was obtained by analyzing the purposely designed membership radar chart. We applied this assessment model to evaluate the construction risk of the Tiger Mountain tunnel in section ZK3+280-ZK3+300. The study shows that the improved cloud model delivers a more scientific and reasonable risk assessment by using the fuzzy random theory, which introduces a new concept for risk assessment in tunnel construction. (c) 2020 American Society of Civil Engineers.
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