JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2017, Vol. 34 ›› Issue (8): 106-110.DOI: 10.11988/ckyyb.20160479

• ROCK-SOIL ENGINEERING • Previous Articles     Next Articles

Expression of k-n Based on Fluid-solid Coupling Experiment

LI Zheng-hui1, WANG Shi-mei1, 2, 3, GUO Zhen1, LU Peng1, JIN Lai-fu1   

  1. 1.College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China;
    2.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, China;
    3. Hubei Provincial Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area, Yichang 443002, China
  • Received:2016-05-17 Revised:2016-06-14 Online:2017-08-01 Published:2017-08-18
  • Contact: 王世梅(1965-),女,湖北宜昌人,教授,博士,主要从事岩土力学特性及试验、地质灾害机理及预测评价方面的研究工作,(电话)13972598072(电子信箱)wsm3044@163.com。
  • Supported by:
    国家自然科学基金面上项目(41372359)

Abstract: The expression of k-n is crucial in the analysis and calculation of fluid-solid coupling problems in geotechnical engineering. The relationship of k-n obtained from conventional laboratory seepage test deviates from reality as the fluid-solid coupling effect is not considered. To get a more accurate relationship between porosity and permeability coefficient, triaxial fluid-solid coupling test under varying consolidation pressure was conducted on a self-developed SRS-1 seepage and creep coupling test apparatus. The variation of porosity against time was obtained, and the fitted expressions of k-n with and without fluid-solid coupling effect are acquired. The expressions together with Kozeny-Caman's empirical formula were analyzed and then were used in the numerical simulation of one-dimensional saturated foundation consolidation in consideration of fluid-solid coupling. Then the calculation results were compared with the result of classical seepage mechanics method. Results show that 1) fluid-solid coupling effect should be taken into consideration as porosity changes dynamically in the process of seepage; 2) fluid-solid coupling problem should not be solved with classical seepage mechanics method, otherwise the error is too big; 3) since Kozeny-Caman's empirical formula, which is widely used in numerical simulation of fluid-solid coupling problem, could not accurately reflect the relationship between permeability coefficient and porosity of clay, we do not recommend it for numerical modeling; 4) the expression of k-n in consideration of fluid-solid coupling effect is recommended to improve the accuracy of numerical simulation results.

Key words: fluid-solid coupling, seepage test, k-n relationship, numerical modeling, consolidation of foundation

CLC Number: