【摘要】：根據(jù)刀具破巖過程中聲發(fā)射的產(chǎn)生與應力場存在的耦合關系,從細觀上分析了聲發(fā)射能量與應力之間的關系,確定了刀具靜力侵入巖石破碎時聲發(fā)射能量的關系式;應用巖石破裂分析軟件RFPA~(2D)進行刀具破巖聲發(fā)射數(shù)值實驗。結(jié)果表明:刀具靜力侵入單位體積巖石破碎釋放的聲發(fā)射能量與加載速率、巖石抗壓強度、巖石彈性模量、刀具形狀以及刀具與巖石的摩擦系數(shù)等有關;隨加載速率增加(一定范圍內(nèi)),兩種刀具破巖釋放聲發(fā)射累積能量急劇增加,隨后聲發(fā)射累積能量增加緩慢;十字型刀具破碎巖石單元和聲發(fā)射累積能量均大于一字型刀具,且破碎巖石所需時間減小;適當增大加載速率可以提高刀具破巖效果。
[Abstract]:According to the coupling relationship between acoustic emission and stress field in the process of cutting tool rock breaking, the relationship between acoustic emission energy and stress is analyzed from a meso view, and the formula of acoustic emission energy when tool invades rock breakage by static force is determined. The acoustic emission (AE) experiments of cutting tools are carried out by using rock fracture analysis software RFPA~ (2D). The results show that the acoustic emission energy and loading rate, rock compressive strength, elastic modulus of rock, tool shape and friction coefficient between cutting tool and rock are related to the static invasion of unit volume rock. With the increase of loading rate (within a certain range), the cumulative energy of acoustic emission (AE) released by the two cutting tools increases sharply, and then increases slowly. The rock unit and acoustic emission accumulative energy of cross cutting tool are both larger than that of one shaped tool, and the time required to break rock is reduced, and the rock breaking effect can be improved by increasing the loading rate properly.
【作者單位】： 湖南科技大學資源環(huán)境與安全工程學院;中鐵十一局集團城市軌道工程有限公司;
【基金】：國家自然科學基金資助項目(51474103) 湖南省自然科學基金項目(2015JJ2070)
【分類號】：TD315

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