Cracking mechanism and control strategy of concrete roadside wall with large scale
WANG Xiaoqing
ZHANG Nong
KAN Jiaguang
ZHANG Nianchao
Abstract：To avoid cracking failure of large-scale concrete roadside wall of gob-side entry retaining in deep mine,hydration heat determination experiment was implemented for understanding hydration heat release characteristics of filling materials.Based on the experiment,temperature field evolution law of roadside wall was simulated by ANSYS software,and variation characteristic of temperature stress was calculated theoretically,then failure process and mechanism of roadside wall were studied under dual effect of both temperature stress and mining-induced stress.The results show that temperature cracks on roadside wall are induced by temperature stress exceeding the tensile strength of roadside wall,which is caused by temperature difference between inside and outside wall with the maximum value 22.0 ℃.And temperature cracks extend by the effect of roof pressure,resulting in wall cracking failure.Based on double factor cracking mechanism of roadside wall,cracking control strategy was proposed from both aspects of reducing temperature difference and relieving roof pressure,which was applied to 1231(1) gob-side entry retaining and proved to have good effect.
Keywords：deep minegob-side entry retainingconcrete roadside wallhydration heatcrack
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 237-243 )