Feasibility analysis of subgrade sinking using seismic techniques

摘要

It is a common method to calculate subgrade sinking that resolving Biot concretion equation using Finite Element Method (FEM), which is restricted in application for time consuming and high cost when getting elastic parameters by triaxial test. According to the relation between density, velocity and elastic parameters, such as Es andμ, of the subgrade, this paper introduces velocity and density into rigid matrix to solve Biot concretion equation, and discusses integrated seismic method in settlement calculation. The simulation analysis and application result show that: 1. The variety of velocity causes to the variety of settlement that can be illustrated by isoline chart of settlement increment of y direction and by isoline chart of settlement if velocity varies sharply enough. 2. The variety of sinking increment has the opposite trend of the velocity increment on each orientation. 3. Settlement changes more sharply on the lengthways than that on the landscape orientation while velocity changes. 4. There is a break at the point of velocity variety on the sinking increment isoline chart. It demonstrates that seismic techniques are effective methods in calculating subgrade sinking.