Study on montoring simulation of urban space Environmental Science grouting by transient electromagnetic field

Abstract Grouting is one of the most effective methods to control underground space engineering disasters. It can effectively achieve a series of governance goals such as reinforcement of broken ground, reduction of settlement, and prevention and control of water and mud inrush. The form of the grouting process, the diversity of the grout, and the complexity of the stratum being injected are the key issues that restrict the development of grouting monitoring. Traditional grouting monitoring is mainly to control the grouting flow and pressure to achieve the grouting process and the state of grout diffusion. Routine testing The method can only perform spot inspection on the space or judge the overall space density, and it is difficult to monitor the spread of the slurry during the grouting process and the effective detection of the effect after the grouting. Based on the characteristics of transient electromagnetic sensitivity to low-resistance bodies, simple construction methods, and large detection depth, this paper uses theoretical analysis and numerical simulation as the main research methods to carry out forward simulation research on the diffusion process of grout in the formation. Through the establishment of numerical models for the different content of slurry in the middle layer of the same thickness layered formation, the possibility of using the electromagnetic field to explain the slurry diffusion in the grouting process is explored. Under ideal conditions, the transient electromagnetic response characteristics of the middle layer with different slurry conditions are analyzed. It is proved that the change of the field value of the transient electromagnetic secondary field before and after grouting can effectively judge the intrusion effect of the grout during the grouting process.