| At present,cement is commonly used to reinforce soft soil by chemical reinforcement method in engineering in China.Taking Fengnan coastal soft soil of Tangshan as an example,the soil was strengthened by adding steel slag powder and ore powder into the soft soil,so as to achieve good reinforcement effect of soft soil foundation and make the cost of foundation treatment more economical,more simple and more environmentally friendly.The changes of macroscopic mechanical parameters and microstructure of soil under different conditions are obtained,and the reasons for the improvement of mechanical properties of soft soil are analyzed.The results show that both steel slag powder and ore powder have the effect of improving the mechanical property of soft soil,and the mechanical property improvement degree is greatly affected by the mixing ratio of the two.The dynamic elastic modulus and dynamic shear strength of soil increased with the increase of confining pressure,but the dynamic damping ratio decreased with the increase of confining pressure.Compared with the soft soil,the dynamic elastic modulus,dynamic and static shear strength,dynamic and static internal friction Angle and dynamic and static cohesion of the 20% ore powder soil increase,but the dynamic damping ratio decreases.The main reason is that the dry density of the consolidated soil is greater than that of the soft soil after the addition of ore powder,and the interaction force between the soil particles increases.The dynamic characteristics of soft soil foundation strengthened by steel slag powder and ore powder were tested,and the change law of soil physical parameters and the main reasons for the change of mechanical properties under different conditions were obtained by means of comparison analysis of macroscopic mechanics and microstructure.It not only provides reliable dynamic characteristics reference parameters for foundation soil in Fengnan coastal area of Tangshan city,but also provides relevant data support for the application of the two in strengthening soft soil foundation.Figure 48;Table 31;Reference 47... |
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