本文選題：采空區(qū)圍巖 + 聲發(fā)射��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：現(xiàn)在,國內(nèi)許多老礦山都留下了大面積采空區(qū),這些采空區(qū)由于應(yīng)力集中、圍巖風(fēng)化、爆破采動等因素的影響,有些出現(xiàn)了冒頂、片幫甚至巖爆等地質(zhì)災(zāi)害現(xiàn)象,嚴(yán)重影響了礦山的安全生產(chǎn),是礦山最大的危險源之一。本文以魯電礦業(yè)公司自走鐵礦地壓監(jiān)測項(xiàng)目為背景,對1530中段、1580中段部分采空區(qū)圍巖的失穩(wěn)規(guī)律進(jìn)行分析。論文撰寫過程結(jié)合了現(xiàn)場調(diào)查、室內(nèi)試驗(yàn)、數(shù)值模擬、理論計(jì)算、編程計(jì)算、理論分析等研究方法,發(fā)現(xiàn)了圍巖失穩(wěn)的部分規(guī)律,對以后礦山的工程監(jiān)測、預(yù)測采空區(qū)圍巖狀態(tài)及失穩(wěn)圍巖的及時處理具有實(shí)際意義。綜合全文,本文的主要工作內(nèi)容及研究成果如下:1、對自走鐵礦1530中段、1580中段采空區(qū),特別是1530分層和1580分層,進(jìn)行實(shí)地勘查、向礦山的師傅們咨詢并搜集相關(guān)地質(zhì)資料。同時掌握了關(guān)于聲發(fā)射相關(guān)知識及聲發(fā)射技術(shù)在巖石力學(xué)方面的應(yīng)用,總結(jié)國內(nèi)外研究現(xiàn)狀,探討了本文命題的研究意義。2、設(shè)計(jì)室內(nèi)試驗(yàn)方案,進(jìn)行灰?guī)r單軸壓縮聲發(fā)射試驗(yàn),對實(shí)驗(yàn)數(shù)據(jù)進(jìn)行處理,然后對部分聲發(fā)射參數(shù)進(jìn)行了初步分析,為后面進(jìn)行分形理論分析提供基礎(chǔ)數(shù)據(jù)。3、利用FLAC3D對1530中段、1580中段的采空區(qū)進(jìn)行模擬。模擬的過程中考慮到計(jì)算量的問題對采空區(qū)做了部分精簡。計(jì)算結(jié)果有最大主應(yīng)力分布、最小主應(yīng)力分布、塑性區(qū)分布及位移云圖;并對采空區(qū)圍巖壓力進(jìn)行理論計(jì)算;根據(jù)以上這些計(jì)算結(jié)果作出分析,對聲發(fā)射傳感器布置位置進(jìn)行優(yōu)化。4、對實(shí)驗(yàn)及工程監(jiān)測中搜集到的參數(shù),主要是應(yīng)力、振鈴計(jì)數(shù),利用matlab編制分形維數(shù)算法,計(jì)算出了相應(yīng)時間序列的分形維數(shù)。并據(jù)此得出無論是室內(nèi)的巖石試件還是工程中的巖體的破壞,總體來看都是一個降維的過程,分形維數(shù)在巖石破壞時降到最小值。這個連續(xù)降維過程就是巖石形成大破裂面的過程,就是巖體失穩(wěn)破壞的過程。5、對實(shí)際工程中的監(jiān)測數(shù)據(jù)利用分形模型進(jìn)行分析,得到分形維值D=1.22作為該采空區(qū)圍巖失穩(wěn)的一個預(yù)警值。并應(yīng)用該結(jié)論與現(xiàn)有軟件結(jié)合對采空區(qū)圍巖進(jìn)行監(jiān)測、分析和預(yù)警。
[Abstract]:At present, many old mines in China have left large areas of goaf. Due to the effects of stress concentration, weathering of surrounding rock, blasting and mining, some of these goaf areas have appeared geological disasters such as roof fall, slab cover and even rockburst.It seriously affects the safety of mine production and is one of the biggest dangerous sources of mine.Based on the monitoring project of ground pressure of Zetu Iron Mine of Ludian Mining Company, this paper analyzes the instability law of surrounding rock in the goaf of 1530 middle section of Xu1580.Combined with field investigation, laboratory test, numerical simulation, theoretical calculation, programming calculation, theoretical analysis and other research methods, some laws of surrounding rock instability are found, and the engineering monitoring of the mine is carried out in the future.It is of practical significance to predict the state of goaf surrounding rock and the timely treatment of unstable surrounding rock.Synthesizing the full text, the main contents and research results of this paper are as follows: 1. The goaf in the middle section of No. 1530 No. 1530 of Zoumao Iron Mine, especially the 1530 and 1580 layers, is investigated on the spot, and the teachers of the mine are consulted and the relevant geological data are collected.At the same time, it grasps the relevant knowledge of acoustic emission and the application of acoustic emission technology in rock mechanics, summarizes the present research situation at home and abroad, probes into the significance of the research of this thesis, the test scheme in the design room, and carries out the uniaxial compression acoustic emission test of limestone.The experimental data are processed, and some acoustic emission parameters are analyzed preliminarily, which provides basic data for fractal theory analysis. FLAC3D is used to simulate the goaf in the middle section of 1530 and 1580.In the process of simulation, the mined-out area is partially simplified considering the computational cost.The calculated results include the maximum principal stress distribution, the minimum principal stress distribution, the plastic zone distribution and the displacement cloud map, and the theoretical calculation of the surrounding rock pressure in the goaf.The location of acoustic emission sensor is optimized. The parameters collected in the experiment and engineering monitoring are mainly stress and ringing count. Fractal dimension algorithm is compiled by matlab and the fractal dimension of the corresponding time series is calculated.It is concluded that both the indoor rock specimen and the rock mass failure in engineering are a process of dimensionality reduction, and the fractal dimension is reduced to the minimum value when the rock is destroyed.This continuous dimensionality reduction process is the process of rock formation of large fracture surface, that is, rock mass instability and failure process .5. the monitoring data in actual engineering are analyzed by using fractal model.The fractal dimension DX 1.22 is obtained as an early warning value for the instability of surrounding rock in the goaf.The conclusion is combined with the existing software to monitor, analyze and warn the surrounding rock in goaf.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD325

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