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- Title
高温冻土固结试验研究与理论分析.
- Authors
刘世伟; 吕生玺; 张建明; 张 虎; 明 锋
- Abstract
Warm frozen soil will generate remarkable deformation under loading or temperature rise. In order to fully recognize the deformation properties and mechanism of warm frozen soil, a series of laboratory tests were conducted to study the consolidation deformation for frozen soil with different water contents of 40%, 80% and 120% at different temperatures (-0.3,-0.5,-0.7,-1.0 and -1.5 ℃) under stage continuous loading conditions (0.1,0.2,0.3,0.4 and 0.5 MPa). The compression parameters consisting of compressibility modulus and compressibility index and secant modulus were obtained on the basis of compression tests. The results show that the values of compressibility modulus Es1-2 are located in high compressibility region, exponential function can perfectly describe the relationship between compressibility index and temperature, ε-p curves are basically in accordance with hyperbolic model. Consolidation coefficient obtained from tests can be evaluated by adopting Taylor’s t method. The test results indicate that the consolidation coefficient of warm frozen soil has the magnitude of order just the same as that of ultra-soft soil, the relationship between consolidation coefficient and consolidation stress obeys the same regulation law as a soft soil does. In order to simulate the process of consolidation test, one-dimension Terzaghi consolidation differential equation for warm frozen soil was proposed on account of the three phase composition and mass conservation and principle of effective stress. A theoretical expression of consolidation coefficient was derived spontaneously. We compared the magnitude of consolidation coefficient between theoretical values and experimental values. Meanwhile, the change regulation between consolidation coefficient and temperature had been discussed. It is concluded that the deformation mechanism of warm frozen soil cannot be explained by Terzaghi consolidation theory.
- Publication
Yellow River, 2020, Vol 42, Issue 8, p136
- ISSN
1000-1379
- Publication type
Article
- DOI
10.3969/j.issn.1000-1379.2020.08.029