Method of estimating dynamic elastic modulus of subgrade soil based on state variable and stress variable
A technology of dynamic resilience modulus and state variables, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the state variables of subgrade soil, stress variables and physical properties of subgrade soil cannot be considered at the same time, and the estimation is inaccurate. The effect of reducing test volume, high accuracy, and reducing test difficulty
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[0052] The specific implementation process of the present invention is demonstrated with sandy low liquid limit clay, and Table 2 is a statistical table of physical property indicators of sandy low liquid limit clay.
[0053] Table 2 Statistical table of physical property indexes of sandy low liquid limit clay
[0054]
[0055] Step a: Make test pieces under 85%, 90%, 95%, and 100% compaction, and measure the matrix suction value of each test piece with a pressure plate meter. The test results are as follows: image 3 shown;
[0056] Using the Fredlund and Xing model, as shown in formula (2), the soil-water characteristic curve of sandy low liquid limit clay is established, and the model parameters under different compaction degrees are obtained, as shown in Table 3;
[0057]
[0058] where: θ w is the volume moisture content; θ s is the saturated volumetric moisture content; a f , b f , c f and h r is the Fredlund and Xing model parameter, a f is the air intake ...
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