【摘要】：基于切頂短臂梁理論,分析無(wú)煤柱切頂自成巷技術(shù)原理,結(jié)合檸條塔礦施工經(jīng)驗(yàn),總結(jié)出"支、切、護(hù)、封"四步成巷工藝。通過(guò)建立聯(lián)孔聚能爆破力學(xué)模型,分析無(wú)煤柱自成巷聚能爆破機(jī)制,得出聯(lián)孔爆破損傷貫通判據(jù)條件,并結(jié)合試驗(yàn)巷道圍巖特性,進(jìn)行聚能切縫關(guān)鍵參數(shù)設(shè)計(jì)。綜合運(yùn)用理論分析、數(shù)值模擬及現(xiàn)場(chǎng)實(shí)測(cè),對(duì)無(wú)煤柱自成巷切縫前后工作面和巷道礦壓分布規(guī)律和演變機(jī)制進(jìn)行系統(tǒng)研究。結(jié)果表明,由于切縫結(jié)構(gòu)面切斷巷道頂板與工作面頂板巖體間的應(yīng)力傳遞路徑,改變頂板巖層結(jié)構(gòu)形態(tài),工作面和巷道礦壓分布發(fā)生明顯變化。切縫對(duì)工作面礦壓影響有一定范圍,切縫影響區(qū)內(nèi)周期來(lái)壓強(qiáng)度有所減小,周期來(lái)壓步距有所增大。切縫引起的充填結(jié)構(gòu)的支撐作用是造成工作面頂板壓力減小的直接原因,來(lái)壓控制關(guān)鍵層上的有效荷載減小是導(dǎo)致來(lái)壓步距增大的根本原因。受切縫影響,碎石幫頂板巖體將經(jīng)歷"垮落→壓實(shí)→穩(wěn)定"的演變過(guò)程,充分利用采空區(qū)碎脹矸石的自承載特性和巷道圍巖的協(xié)同支撐作用,可有效減小支護(hù)強(qiáng)度,增強(qiáng)巷道穩(wěn)定性。
[Abstract]:Based on the theory of cutting roof and short arm beam, this paper analyzes the technology principle of roof cutting and self-forming roadway without coal pillar, combined with the construction experience of Caragana Tower Mine, sums up the four-step roadway technology of "support, cutting, protecting and sealing". By setting up a mechanical model of combined hole shaped blasting, analyzing the mechanism of coalless self-formed roadway blasting, the condition of damage breakthrough criterion of combined hole blasting is obtained, and the key parameters of shaped energy cutting joint are designed according to the characteristics of surrounding rock of test roadway. Based on the theoretical analysis, numerical simulation and field measurement, the distribution law and evolution mechanism of the rock pressure in the face and roadway before and after cutting seam without coal pillar are studied systematically. The results show that because the stress transfer path between the roof of roadway and the roof rock mass of working face is cut off by cutting joint structural plane, the structure form of roof strata is changed, and the distribution of mine pressure in working face and roadway is obviously changed. The influence of cutting joint on mine pressure has a certain range. The strength of periodic pressure in the zone affected by cutting joint decreases and the interval of periodic pressure increases. The supporting action of the filling structure caused by the cutting joint is the direct cause of the reduction of the roof pressure of the working face, and the reduction of the effective load on the key layer under the pressure control is the fundamental reason for the increase of the step distance. Under the influence of cutting joint, the rock mass of gravel roof will undergo the evolution process of "collapse and compaction stability", and fully utilize the self-bearing characteristics of gangues in goaf and the synergistic support of roadway surrounding rock, which can effectively reduce the supporting strength. Enhance the stability of roadway.
【作者單位】： 中國(guó)礦業(yè)大學(xué)(北京)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)(北京)力學(xué)與建筑工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51674265,51304210,51574248)~~
【分類號(hào)】：TD322

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