Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (3): 435-439.DOI: 10.12068/j.issn.1005-3026.2016.03.028

• Resources & Civil Engineering • Previous Articles     Next Articles

Analysis of Subgrade Stability in Karst Area Based on Variable Weight Theory-Uncertainty Measurement Method

KANG Qian1, WANG Xin-min1, PU Hao2, WANG Shi1   

  1. 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. School of Civil Engineering, Central South University, Changsha 410075, China.
  • Received:2014-11-26 Revised:2014-11-26 Online:2016-03-15 Published:2016-03-07
  • Contact: KANG Qian
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Abstract: In order to study the stability of subgrade in karst area, the analysis model of uncertainty measurement was established based on sixteen indexes having the greatest impact on the karst subgrade stability. Also, the uncertain measurement functions of all indicators were established. Each index weight was calculated by using variable weight to avoid the “state out of balance” phenomenon caused by constant weights evaluation. Finally, the risk grade prediction of subgrade stability was made according to grade determination based on confidence identification criteria. This model was applied to the highway reconstruction project in Shimen City Hunan Province. The results showed that the risk grade of 1# subgrade and 2# subgrade were Ⅳ and Ⅲ respectively. Namely, the risk grade of 2# subgrade is higher. The results agree well with the actual engineering. The method can provide a new way for subgrade stability analysis and a reference to subgrade design and construction.

Key words: highway, stability analysis, uncertainty measurement, karst subgrade;variable weight calculation

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