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Expansive clay in semiarid area behaves features of typical unsaturated soil, which is sensitive to climate and moisture, appears multi-fissures, deterioration of mechanical performances with the change of moisture. Consequently, to ensure the rational design of foundation treatment, and safe operation, research on moisture migration mechanism of expansive clays is of great significance. Herein, test models of mixed water migration and vaporous water migration were presented to investigate the mechanism. Series of tests, in which the moisture content in left soil column was same as 24%, and in right soil column was 0%, 6%, 12% and 18% respectively, were conducted under constant temperature. It is concluded that the moisture content changed with increase of migration time in both migration models, and the migration behaves nonlinear when the initial water content increase up to 6% for mixed water migration model and 12% for vaporous water migration model. But the migration characteristic of mixed water and vaporous water were different. The initial 30 days the change of moisture water was larger in mixed migration model, however in vaporous water migration model within 60 to 90 days was larger. These results will provide a basis for reveal evolution mechanism of engineering behaviors of unsaturated expansive clays.

The evaluation of economic efficiency of industrial enterprises is a comprehensive uncertainty system problem. Based on the theory of set pair analysis, stochastic simulation of triangular fuzzy numbers, a novel evaluation method for the economic efficiency of industrial enterprises was investigated in this paper. A concept of multi-element connection number of the set pair, which was consisted of evaluation index sets and classification standard sets of the economic efficiency of industrial enterprises, was introduced to express the hierarchy and fuzziness of membership between the evaluation sample and classification standard. Moreover, the triangular fuzzy number simulated by Monte-Carlo method was presented to depict the changing process and fuzziness of component coefficients of discrepancy degree. Combined with the weight of evaluation index, the integrated connection number was calculated to assess the grade of economic efficiency of industrial enterprises of the sample. The evaluation in form of a confidence interval corresponding to a confidence level was also given. Finally, a practical example was described to confirm and to compare with the extension method. The results show that the proposed model is more feasible and easy to operate, and the result is good. It can make full use of the uncertainty information of evaluation index and grade classification standard for the economic efficiency of industrial enterprises, and resolve the difficulties of traditional operations of triangular fuzzy numbers and their functions.