發(fā)布時(shí)間：2018-07-09 09:43

  本文選題：點(diǎn)荷載試驗(yàn) + 巖石強(qiáng)度��； 參考：《巖土力學(xué)》2014年S1期

【摘要】：在川南地區(qū)在近年的煤炭開發(fā)過程中,多數(shù)基建礦井在巷道開拓期間大量出現(xiàn)圍巖軟弱、易風(fēng)化、節(jié)理裂隙發(fā)育、變形大、支護(hù)難、多次返修等嚴(yán)重困擾礦井正常投產(chǎn)的支護(hù)難題,為合理選取支護(hù)技術(shù),必須對(duì)軟巖類型及等級(jí)進(jìn)行劃分。首先進(jìn)行地質(zhì)工程調(diào)查,選擇巷道主要分布的厚層黑灰色泥巖為研究對(duì)象,在井下采用點(diǎn)荷載測(cè)試儀對(duì)新鮮不規(guī)則巖塊進(jìn)行強(qiáng)度測(cè)試。在對(duì)可疑數(shù)據(jù)采用Grubbs準(zhǔn)則進(jìn)行取舍后,采用傳統(tǒng)法、ISRM法、工程分級(jí)法分別進(jìn)行點(diǎn)荷載強(qiáng)度計(jì)算,所得結(jié)果采用F檢驗(yàn)法和t檢驗(yàn)法對(duì)各公式計(jì)算結(jié)果進(jìn)行隨機(jī)誤差和系統(tǒng)誤差檢驗(yàn),研究各方法的適宜性。研究發(fā)現(xiàn),在對(duì)泥巖進(jìn)行點(diǎn)荷載測(cè)試時(shí),傳統(tǒng)法和ISRM法較工程分級(jí)法所得單軸抗壓強(qiáng)度平均值的隨機(jī)誤差和系統(tǒng)誤差小,更適宜作為該類巖性進(jìn)行工程軟巖分級(jí)評(píng)價(jià)時(shí)的重要指標(biāo);點(diǎn)荷載所獲泥巖強(qiáng)度值的偏差系數(shù)在11%~30%范圍內(nèi),與一般巖石單軸抗壓強(qiáng)度測(cè)定值偏差系數(shù)接近,具有可靠、快速、方便、費(fèi)用低的優(yōu)點(diǎn),適宜作為圍巖取樣困難的巷道進(jìn)行軟巖類型評(píng)價(jià)的測(cè)試方法。
[Abstract]:In the process of coal exploitation in recent years in south Sichuan area, the surrounding rock is weak, weathering easily, joints and fissures are developed, deformation is large and support is difficult in most capital construction mines during roadway development. In order to select the support technology reasonably, the types and grades of soft rock must be divided. Firstly, geological engineering investigation was carried out, and the thick layer black gray mudstone, which was mainly distributed in roadway, was selected as the research object, and the strength of the fresh irregular rock mass was tested by point load tester in the downhole. After adopting Grubbs criterion to select and choose the suspicious data, the traditional ISRM method and the engineering classification method are used to calculate the point load strength, respectively. The results are tested by F-test method and t-test method to test the random error and systematic error of each formula, and the suitability of each method is studied. It is found that the random error and systematic error of the average value of uniaxial compressive strength obtained by the traditional method and ISRM method are smaller than that of the engineering classification method in the point load test of mudstone. The deviation coefficient of mudstone strength obtained by point load is in the range of 11% and 30%, which is close to the deviation coefficient of general rock uniaxial compressive strength measurement, and is reliable and fast. The advantages of convenience and low cost are suitable for evaluating soft rock types in roadways with difficult sampling of surrounding rock.
【作者單位】： 中國礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;中國礦業(yè)大學(xué)(北京)資源與安全工程學(xué)院;四川省煤炭產(chǎn)業(yè)集團(tuán)有限責(zé)任公司;
【基金】：中央高�；究蒲谢鹳Y助(No.2012800015DQ) 教育部高校博士點(diǎn)基金資助(No.20130023120011)
【分類號(hào)】：TU45

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