Safety Assessment of High Holtage Transmission Foundation in Goaf of Coal Mine

Abstract

Coal mine goaf is a poor construction site with hidden, complex, large surface deformation range and easy to cause geological disasters, which is very harmful to the construction of ground engineering. Therefore, the stability of the goaf site is a prerequisite for the stability of the structure and should be evaluated before construction. Based on the topic of “stability evaluation of the goaf base of 330kV shen-dang I and II line connecting jinjie transformer transmission line project”, this paper conducts a special investigation and evaluation of the transmission line through jinjie coal mine goaf in shenmu city. In the huge collection of the mining area of the regional geological and mineral constructed over the report, the coal geological exploration and mining design, on the basis of such information to goaf Kentucky lines (C14~C17) actual investigation, geological survey, engineering survey, engineering geophysical exploration (tem), find out the preliminary Kentucky goaf site engineering geological condition, hydrogeological condition, the coal mined-out area distribution and its characteristics, etc. The stability of the ground foundation site was qualitatively evaluated by the mining condition discriminant method (taking the mined-out area final mining time, roof lithology and the thickness of loose bed as factors), and the evaluation results showed that the site was in a basically stable state. Secondly, the numerical analysis method was used to calculate and analyze the surface movement and deformation of the mined-out area of the base. The stability of the mined-out area of the base was evaluated quantitatively. The results showed that the mined-out area of the base was in a basically stable state, which was consistent with the qualitative judgment. The research results have some reference value for other surface engineering construction and geological disaster prevention in jinjie coal mine of shenmu city.