本文關(guān)鍵詞： 深部大斷面 回采巷道 Hoek-Brown強(qiáng)度準(zhǔn)則 上限法 頂板 錨索設(shè)計(jì)　出處：《巖土力學(xué)》2017年08期 　論文類型：期刊論文

【摘要】：針對(duì)目前深部大斷面回采巷道控制難題和相應(yīng)的高強(qiáng)錨索控制技術(shù),考慮頂板圍巖應(yīng)力與支護(hù)荷載影響,利用Hoek-Brown強(qiáng)度準(zhǔn)則及塑性力學(xué)中的極限分析上限法,得到了大斷面巷道頂板的冒落破壞機(jī)制,提出了頂板錨索長(zhǎng)度及匹配預(yù)緊力的設(shè)計(jì)方法。基于建立的錨索設(shè)計(jì)參數(shù)影響因素敏感性指標(biāo)對(duì)巷道寬度、巖體重度、圍巖應(yīng)力、巖體抗壓強(qiáng)度、抗拉強(qiáng)度、錨索布設(shè)間距、頂角錨索布設(shè)傾角等因素的影響進(jìn)行了分析。結(jié)合現(xiàn)場(chǎng)實(shí)際情況,提出了深部大斷面回采巷道圍巖控制的工程建議。將此設(shè)計(jì)方法應(yīng)用到千米深井趙樓煤礦1305孤島工作面的運(yùn)輸順槽頂板錨索參數(shù)確定中,有效地控制了圍巖變形。研究表明:在高應(yīng)力大斷面回采巷道中,頂板錨索需錨固在穩(wěn)定巖層中,并施加足夠的預(yù)緊力,才可有效控制頂板圍巖冒落或破壞;頂板錨索所需預(yù)緊力隨巖體抗拉強(qiáng)度、抗壓強(qiáng)度及巖體經(jīng)驗(yàn)參數(shù)A的增大而減小,隨巷道寬度、巖體重度、圍巖應(yīng)力、錨索布設(shè)間距、頂角錨索布設(shè)角度以及巖體經(jīng)驗(yàn)參數(shù)B的增大而增大,其敏感性最高的影響因素為圍巖應(yīng)力。因此,在深部高地應(yīng)力巷道設(shè)計(jì)中,需特別重視地應(yīng)力的影響,采用高強(qiáng)、高延伸率錨索,增設(shè)錨索定量讓壓裝置,高阻讓壓有效釋放圍巖應(yīng)力,并通過施加高預(yù)緊力或注漿加固等方式來提高圍巖完整性,獲得較好的圍巖控制效果。
[Abstract]:In view of the difficult control problem of deep large section mining roadway and the corresponding control technology of high strength anchor cable, considering the influence of roof surrounding rock stress and supporting load, the Hoek-Brown strength criterion and the upper limit method of limit analysis in plastic mechanics are used. The caving failure mechanism of large section roadway roof is obtained, and the design method of roof anchor cable length and matching pretightening force is put forward. Based on the sensitivity index of influencing factors of anchor cable design parameters, the roadway width, rock mass weight and surrounding rock stress are obtained. The influence of factors such as rock mass compressive strength, tensile strength, spacing between anchor cables, inclination angle of anchor cable placement at the top angle and so on are analyzed. The engineering suggestion of surrounding rock control of deep large section mining roadway is put forward. The design method is applied to determine the parameters of roof anchor cable in 1305 isolated island coal face of Zhaolou coal mine. The study shows that in the roadway with high stress and large section, the roof anchor cable should be anchored in the stable rock stratum and applied enough pretightening force to effectively control the roof wall rock caving or damage. With the increase of tensile strength, compressive strength and experience parameter A of rock mass, the pre-tightening force required by roof anchor cable decreases, and with the width of roadway, the weight of rock mass, the stress of surrounding rock, the spacing of anchor cable, The stress of surrounding rock is the most sensitive factor of the increase of the angle of anchor cable arrangement and the experience parameter B of rock mass. Therefore, in the design of deep roadway with high ground stress, special attention should be paid to the influence of ground stress, and high strength should be adopted. High elongation Anchorage cable, additional cable quantitative pressure device, high resistance pressure effectively release the surrounding rock stress, and through the application of high pretension or grouting reinforcement to improve the integrity of surrounding rock, and obtain a better surrounding rock control effect.
【作者單位】： 濟(jì)南大學(xué)土木建筑學(xué)院;山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;中國礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室;兗礦集團(tuán)有限公司;龍口煤電有限公司;
【基金】：國家自然科學(xué)基金(No.51674154,No.51474095) 中國博士后科學(xué)基金面上資助(No.2016M602144,No.2016M590150) 深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室開放基金(No.SKLGDUEK1717,No.SKLGDUEK1519) 國家重點(diǎn)研發(fā)計(jì)劃專項(xiàng)資助(No.2016YFC060090X)~~
【分類號(hào)】：TD353
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本文編號(hào)：1540092