Quantitative design method of roadway support based on the size of plastic zone of surrounding rock

Abstract

The invention discloses a roadway support quantitative design method based on the size of the plastic zone of the surrounding rock, comprising the following steps: step 1, calculating and determining the radius R of the plastic zone of the surrounding rock of the roadway; step 2, classifying the surrounding rock of the roadway according to the calculation result; Step 3, according to the roadway surrounding rock classification results, carry out targeted support parameter design for different types of surrounding rock; Step 4, modify and adjust the support parameters according to the site monitoring feedback information. The support parameters designed in the present invention based on the size of the plastic zone are scientific and reasonable. On the basis of obtaining the radius of the plastic zone of the roadway and the geometric characteristic index of the boundary, the surrounding rock of the roadway is classified with the radius of the plastic zone as the main index, so as to classify different types of rocks. Surrounding rock is designed with pertinent support parameters to ensure the scientificity and economy of roadway support design; the invention can prevent roadway roof fall accidents for roadway support.

Description

technical field [0001] The invention relates to the technical field of coal mine roadway support safety, in particular to a quantitative design method for roadway support based on the size of the plastic zone of surrounding rock. Background technique [0002] In the 1950s, our country introduced roadway bolting technology in some state-owned mines. For decades, with the continuous development and improvement of bolting theory and bolting materials, bolting has become a coal mine roadway support technology. mainstream technology. However, our country only stays on design methods such as engineering analogy in terms of bolt support design, resulting in poor roadway safety and reliability, and there are hidden dangers that threaten the normal production of coal mines, which greatly limits the development of bolt support technology. Therefore, it is imminent to develop a more scientific, practical and reliable bolt support design method. At present, many scholars at home and a...

AI Technical Summary

Problems solved by technology

[0005] However, most of the surrounding rocks of coal mine underground roadways are coal-measure sedimentary rock formations. Due to the complexity and variability of sedimentary rock formations, coupled with the influence of the superimposed stress field of the original in-situ stress field and the mining stress field generated by mining, the existing In the design of support parameters, only one support parameter is adopted for a roadway, which makes it unable to adapt to the ever-changing support requirements of surrounding rocks, resulting in excess or insufficient support strength of the roadway, making the roadway support protection economy or safety deterioration

Images