【摘要】：采用錨桿軸力無(wú)損檢測(cè)技術(shù),對(duì)采動(dòng)影響區(qū)域錨桿軸力隨工作面推進(jìn)變化情況進(jìn)行了大量現(xiàn)場(chǎng)測(cè)試,發(fā)現(xiàn)錨桿軸力變化與采場(chǎng)超前支承壓力分布具有明顯的對(duì)應(yīng)關(guān)系。以淮南某礦回采工作面運(yùn)輸平巷錨桿軸力實(shí)測(cè)數(shù)據(jù)為例,檢測(cè)結(jié)果表明:在距采煤工作面0~20 m范圍內(nèi),受采動(dòng)影響嚴(yán)重,錨桿軸力變化較大;在距工作面5 m范圍之內(nèi),存在支承壓力減壓區(qū),此區(qū)域內(nèi)錨桿軸力降低;在距工作面5~20 m范圍內(nèi),對(duì)應(yīng)著支承壓力增壓區(qū),此區(qū)域內(nèi)錨桿軸力增加,且錨桿軸力峰值位于距工作面煤壁10 m左右;在20 m以外區(qū)域,受采動(dòng)影響較小,對(duì)應(yīng)著支承壓力穩(wěn)壓區(qū),此區(qū)域內(nèi)錨桿軸力變化不大。在基本頂斷裂后,位于減壓區(qū)內(nèi)的頂板錨桿軸力急劇下降,同時(shí),位于增壓區(qū)內(nèi)的錨桿軸力峰值明顯下降且位置向前發(fā)生跳躍前進(jìn)。研究結(jié)果表明,采動(dòng)支承壓力分布與錨桿軸力變化存在良好的對(duì)應(yīng)關(guān)系,基本頂斷裂可在錨桿軸力動(dòng)態(tài)響應(yīng)上得到有效體現(xiàn)。
[Abstract]:Based on the nondestructive testing technique of anchor axial force, a large number of field tests have been carried out on the variation of anchor axial force with the working face propulsion in the area affected by mining. It is found that the change of anchor axial force has obvious corresponding relationship with the distribution of the leading supporting pressure in the stope. Taking the measured data of the axial force of the anchor rod in the transport roadway of a mining face in Huainan mine as an example, the test results show that the axial force of the bolt is greatly affected by the mining movement within 20 m from the coal mining face, and within 5 m from the working face. In the range of 520m from the working face, the axial force of the anchor rod increases and the peak value of the axial force of the anchor rod is about 10 m from the coal wall of the working face. In the area beyond 20 m, the influence of mining movement is relatively small, corresponding to the support pressure stable pressure area, the axial force of anchor in this area has little change. After the basic top fracture, the axial force of the roof bolt in the decompression zone decreases sharply, meanwhile, the peak value of the axial force of the anchor rod in the pressurized zone decreases obviously and the position jumps forward. The results show that there is a good relationship between the distribution of mining support pressure and the change of anchor axial force, and the basic top fracture can be effectively reflected in the dynamic response of anchor axial force.
【作者單位】： 中國(guó)礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)礦業(yè)大學(xué)力學(xué)與建筑工程學(xué)院;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)資助項(xiàng)目(2013CB227900) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51227003,51404262)
【分類(lèi)號(hào)】：TD355

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