Research On Test, Measuring And Testing Techniques Of Laws Of Stress Distribution And Transfer In Soil

From some phenomenon of nature or engineering, we can know that the process of stress diffusion, transfer and concentration is a bridge between the initial state and final state of soil. And if character of soil is different, so do the approach and result of stress diffusion, transfer and concentration. City construction is identical with applying load on soil mass, so researching maximal area coverage and locus of stress diffusion, transfer and concentration in soil will be helpful of analyzing the deformation and stabilization of city foundation. It also is important content in the research of ultimate bearing resistance of city geologic environment, and it will provide beneficial reference for city disaster reduction, prevention and city sustainable development. But limiting by development of subject and measuring and testing techniques, the theory and research of stress in soil, just pays attention to interpretation of results, ignores to visualize the process of stress diffusion, transfer and concentration. For this reason, this paper conducts these following heuristic works.This paper chooses lab simulation test to simulate the process ofstress diffusion and transfer. Basing on existing test equipments, we select sandy soil and silty soil for lab simulation test. Through the process of test, we rigid control the moisture content and destiny of soil. On one hand, the conclusions of lab simulation test verified the laws of diffusion and transfer of additional stress. On the other hand, it also confirmed that change of soil character did affect the diffusion and transfer of stress in soil. At the same time, we obtained the influencing laws of stress diffusion and transfer by moisture content and destiny of different soil.Furthermore, author designs some tests, such as diffusion speed test of stress in soil under static load and sound wave test. By these tests, Author verified that sound wave test can measure the stress in soil. Comparing those aforementioned tests, we can know that their conclusions is coherent, so those conclusions also verify the feasibility of measuring stress in soil by sound wave tests.