The elasto-plastic analysis of the soil disturbance induced by construction of dry-cement jet mixing cloumns
In this paper,the soil disturbance induced by the construction process of dry-cement jet mixing columns,the change of the radial stress and the tangential stress,and the analytial solution of the radial displacement are all analysed in this paper,the analytial solution to the boundary between the plastic section and the elastic section is also included.
Abstract Many human operations have created a large population of small orbital debris in near Earth environment. The threat they represent for satellites is a major factor for the preparation of future space missions. Several experiments devoted to the study of this environment, as well as various materials exposed to space, have been retrieved in the past few years. The analysis of the results shows some differences with previous modeling. Comparison with data from LDEF and from EURECA give some insight in the long term evolution of particle size distribution. Chemical identification of particle remnants inside craters is difficult but provides valuable information on the origin of the impactors. Permanent monitoring of environment is obviously needed, especially for the type of orbits where data are presently scarce ie. heliosynchronous and geostationary orbits.