Some aspects of forecasting the post-mining substratum deformation for evaluation of its influence on constructions

Piotr Strzałkowski,Roman Ścigała,Katarzyna Szafulera,E Pilecka,T Tatara,J.P Kogut

doi:10.1051/e3sconf/20183601008

Piotr Strzałkowski, Roman Ścigała + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/20183601008

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Abstract

Some problems have been discussed, connected with performing predictions of post-mining terrain deformations. Especially problems occur with the summation of horizontal strain over long time intervals as well as predictions of linear discontinuous deformations. Of great importance in recent years is the problem of taking into account transient values of deformations associated with the development of extraction field. The exemplary analysis has been presented of planned extraction influences on two characteristic locations of building structure. The proposal has been shown of calculations with using transient deformation model allowing to describe the influence of extraction advance influence on the value of coefficient of extraction rate c (time factor), according to own original empirical formula.

Highlights

For the first time, mining operations were carried out under the built-up area at the beginning of the XIXth century
Mining works under the Belgian city of Liege caused damage to buildings, which prompted local mining engineers to conduct geodetic surveys. The results of these measurements became the basis for the development of the first theories of forecasting the impact of underground mining operations on the surface
Analyzes presented in this work allow to make the following final statements and remarks: 1. The problem of post-mining deformations predictions has become simplified due to the availability of appropriate mathematical models and specialized software

Summary

Introduction

For the first time, mining operations were carried out under the built-up area at the beginning of the XIXth century. The issue of the horizontal strain summation in long time intervals is connected with the problem of the discontinuous linear deformations occurrence As it is known, the occurrence of these deformations is closely related to the values and direction of extreme horizontal strain values and the course of tectonic disturbances (especially their outcrops on the floor of overburden layers). It should be noted that methods for forecasting of this type of deformation have not been sufficiently developed so far, which is a serious difficulty in assessing the complex prediction of impact of underground mining works on the surface Another important problem regarding forecasts is making calculations of transient values of deformation indices or their extreme values resulting from the movement of the extraction front.

The exemplary analysis of post-mining deformation distribution over time

Findings

Conclusions