Research on the Methods to Improve the Efficiency of Indoor Variable Head Permeability Test
Indoor variable head permeability test is an important method for studying the permeability characteristics and permeability laws of cohesive soil.However,the current variable head permeability test has some problems in testing the permeability coefficient of cohesive soil,such as large experimental errors and long test-time.The clay samples were prepared from the Taizhou to Yixing section of the Yanyi Railway project.The vertical permeability coefficients and horizontal permeability coefficients of the samples were tested through indoor variable head permeability test.The effects of seepage paths and negative pressure on permeability coefficient and test time were analyzed.The results show that controlling the seepage paths and increasing the negative pressure can shorten the test time while ensuring the validity of the test data.It is an effective measure to improve the efficiency of indoor variable head permeability tests.This research has considerable reference for related geotechnical test research.
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