Study on Soil Permeability Coefficient on CPTU Model Test
Through analyzing excess pore pressure dissipation datum measured by CPTU probe and pore pressure mini- transducers on CPTU model test, the permeability coefficient of soil of CPTU model test has been computed. According to Strain Path method based on Terzaghi consolidation theory, computation formula of soil horizontal permeability coefficient on CPTU model test has been acquired; on CPTU model test dissipating time of 50% degree of consolidation which has been used as calculation standard to compute horizontal permeability coefficient has been acquired by normalized excess pore pressure dissipation curves based on excess pore pressure dissipation datum; through a series of indoor variable head permeability tests, the permeability coefficient of remolded soil of CPTU model groove sampling by horizontal and vertical direction has been acquired, and the results show that horizontal permeability coefficient is about 1.62 times greater than vertical permeability coefficient on indoor variable head permeability test, and large difference between horizontal and vertical permeability property of remolded clay soil on CPTU model test has been existed; compared with the value of two test methods, the value of horizontal permeability coefficient acquired by CPTU model test is roughly an order of magnitude greater than the value of horizontal permeability coefficient acquired by indoor variable head permeability test. The achieved result can provide a foundation for further study for CPTU mechanism.
Y. C. Tang et al., "Study on Soil Permeability Coefficient on CPTU Model Test", Advanced Materials Research, Vols. 261-263, pp. 1401-1405, 2011