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临涣煤矿副井井塔基础为长27.3m、宽20.8m、高7m的钢筋混凝土箱型基础.受地层下沉影响,基础顶板及竖墙产生很多裂缝,裂缝最宽达8mm.但箱基底板尚未发现明显裂缝.副井是矿井的咽喉重地,井塔是重中之重.为了解副井塔基础的破裂程度、分析基础的破坏机理,为选择副井塔治理方案,有必要对箱基底板裂缝的基本情况,包括位置、深度、长度等进行检测.内部结构、疏密程度不同的介质,超声脉冲纵波在其中的传播速度也不同.如介质有裂隙、空洞等,
The foundation pit of Lintao Coal Mine is a reinforced concrete box foundation with a length of 27.3m, a width of 20.8m and a height of 7m. Due to the influence of subsidence, the base roof and the vertical wall produce many cracks with the maximum width of 8mm, The board has not found obvious cracks.Auxiliary wells are throat heavy mine, tower is the most important.To understand the degree of rupture of the foundation of the ancillary tower, based on the analysis of the mechanism of damage, in order to select the pavement control program, it is necessary to box The basic situation of base plate crack, including location, depth, length, etc. The internal structure, density of different media, ultrasonic pulse in which the propagation speed is also different.If the media have cracks, voids, etc.,