共查询到19条相似文献,搜索用时 140 毫秒
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为解决煤矿下山巷道爆破掘进中普遍存在的循环进尺小、炮眼利用率低、爆后矸石堆积迎头、留底严重等问题,基于“裂槽、抛碴”思想,有机结合直眼和斜眼掏槽的各自优点,设计了含抛碴眼的楔形掏槽方式这一新型掏槽结构。在华恒矿-1 000水平副暗斜井,通过改变掏槽眼的布置位置和起爆顺序、设置抛碴辅助眼等措施,结合弧形和直线形组成的混合型辅助眼布置方式,制定出3种下山巷道爆破掘进技术方案并进行现场试验。通过掘进进尺、残眼深度、巷道成型、抛碴距离、矸石块度、矸石高度等指标,评价设计方案,最终优选出一种综合指标最好的爆破方案。该矿采用此技术,月进尺提高了40%以上,验证了该技术在下山巷道爆破掘进中的有效性。 相似文献
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煤系高岭土岩石巷道掘进爆破技术优化 总被引:7,自引:1,他引:7
煤系高岭土矿岩是尚待大量开发的重要非金属矿产。高岭土坚固性较低(f=3~4)、脆性较强,在其内进行巷道掘进爆破,除要保证有较高的掘进进尺、良好的周边成型外,还应尽可能地增大炮眼布置参数,同时,还应严格控制装药量,延长段问顺序起爆延迟时间,以提高爆破碎块的大块率。通过采用合理的掏槽方式、周边光面爆破参数和水垫层不耦合装药结构,并在无沼气危害的情况下,采用秒延期电雷管,取得了良好的爆破效果。综合分析实测结果表明:爆破进尺高、速度快、周边成型好、碎块抛掷作用小、高岭土矿岩大块率高。 相似文献
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坚硬岩层的爆破在巷道掘进中,是一个重要问题。为提高爆破效率,保证巷道工程质量,加快掘进速度,我们在单机多掌(2— 相似文献
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传统研究对于煤系地层巷道围岩的变形破坏监测均在掘进面后方进行,无法获得巷道掘进全过程的围岩变形,更缺乏对煤矿深井巷道掘进全过程中围岩变形破坏规律的认识。为此,针对济宁三号煤矿深井巷道,通过超前布置监测断面,首次获得了煤矿深井巷道掘进全过程的围岩变形破坏规律;利用考虑体积应力的改进横观各向同性应变软化模型对巷道开挖全过程的围岩变形破坏特征进行分析。研究结果表明:在济宁三号煤矿七采区巷道地质条件下,浅部围岩的累计变形量和变形速率均大于深部围岩;巷道掘进全过程中,围岩变形随掘进面的推进经历了缓慢增长、迅速增长和变形稳定3个阶段;变形稳定后围岩松动圈深度约为1.0 m;巷道两帮围岩位移与破坏深度均在控制范围内,顶底板围岩破坏相对严重,并给出了相应解决方案。研究成果可为揭示煤矿深井巷道掘进围岩的变形破坏规律以及合理确定支护方案和参数提供重要的科学依据。 相似文献
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通过多次在突出煤层掘进巷道迎头进行震波探测试验,并使用频谱分析和时频分析技术得到各巷道的单道震波信号的频率参数,对比分析各条巷道对应的瓦斯检验参数,建立起煤体瓦斯绝对涌出量与震波频率参数的关系:震波能量主要集中在两个独立的频率域内,高频区和低频区分别对应了震波的主频和次主频;随着煤体瓦斯含量的增大,震波的主频和次主频相应降低,且次主频对瓦斯含量的变化更为灵敏。利用震波频率参数预测掘进巷道迎头附近瓦斯含量,可为瓦斯突出危险性预测提供一种新的参数。 相似文献
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一九八○年我队在新田岭矿区施工巷道(平巷),用直眼掏槽爆破法取得了一些经验,炮眼利用率由60~70%逐步提高到90%以上,工程质量也比较好,巷道的掘进方向、掘进坡度和断面规格均符合设计要求和坑探工程施工的质量标准规定。现就怎样提高爆破效率的问题,谈谈我队的作法和体会。 相似文献
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小间距隧道爆破动力特性试验研究 总被引:5,自引:2,他引:3
分岔隧道是一种新型隧道结构形式。以漆树槽分岔隧道为工程背景,进行了掘进爆破的围岩震动效应试验,通过不同掏槽结构下爆破震动作用隧道围岩衬砌质点振动速度的频谱分析与质点振动速度幅值的分布情况分析,对小间距公路隧道混凝土衬砌及其围岩在爆破地震波作用下的力学特征进行论述,重点研究了小间距隧道中隔墙及爆破掌子面的震动特性及变化规律。试验与分析结果表明,(1)中墙迎爆侧为振速峰值区,以水平径向振速最大,且沿着中墙走向呈现规律性变化;(2)掏槽孔爆破产生的地震效应最为强烈,其震动强度是扩槽眼和周边眼的2倍左右;(3)衬砌振速主振频率主要分布在低频段,以20~95 Hz为集中频段,高频地震波衰减极快;(4)同一测试断面中最大振速峰值出现在拱顶和边墙中部位置的概率最大,且大小比较接近,爆破掌子面附近的振速不适合萨道夫斯基预测公式,受爆破夹制及自由面的影响较大。 相似文献
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Bo Li Li Wu Changmao Xu Qingjun Zuo Shuanglan Wu Binbin Zhu 《Geotechnical and Geological Engineering》2016,34(4):1155-1169
While tunneling metros in granite strata using a shield tunneling, cutter heads of shield machines frequently get stuck and are damaged by boulders. Currently, effective methods for solving this problem have not been found in the world. By studying the Shenzhen Metro Line 7 in China, this research proposed a new method for predicting and coping with boulders in metro tunneling using a shield tunneling by combining microtremor survey, supplementary precise geological prospecting and surface drilling blasting. Moreover, with the elaboration of the principle and implementing steps, this method was applied in the specific engineering example. To begin with, the characteristics of H/V curve shapes of boulders exposed in the excavated sections using the shield tunneling were obtained. On this basis, we interpreted and judged the distribution forms of boulders in the unexcavated sections ahead. Afterwards, supplementary precise geological prospecting was performed to the boulders in the predicted positions according to the interpretations so as to verify and revise the interpretations. After ascertaining the distribution location and size of boulders ahead shielding sections, surface drilling blasting or punching was carried out to blast boulders. Engineering application results showed that this method has favorable effects and can provide a scientific and reasonable guidance for the development of theories of microtremor survey and the detection of boulders. 相似文献
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Prediction of ground vibration due to quarry blasting based on gene expression programming: a new model for peak particle velocity prediction 总被引:1,自引:1,他引:0
R Shirani Faradonbeh D Jahed Armaghani M. Z. Abd Majid M. MD Tahir B. Ramesh Murlidhar M. Monjezi H. M. Wong 《International Journal of Environmental Science and Technology》2016,13(6):1453-1464
Blasting is a widely used technique for rock fragmentation in opencast mines and tunneling projects. Ground vibration is one of the most environmental effects produced by blasting operation. Therefore, the proper prediction of blast-induced ground vibrations is essential to identify safety area of blasting. This paper presents a predictive model based on gene expression programming (GEP) for estimating ground vibration produced by blasting operations conducted in a granite quarry, Malaysia. To achieve this aim, a total number of 102 blasting operations were investigated and relevant blasting parameters were measured. Furthermore, the most influential parameters on ground vibration, i.e., burden-to-spacing ratio, hole depth, stemming, powder factor, maximum charge per delay, and the distance from the blast face were considered and utilized to construct the GEP model. In order to show the capability of GEP model in estimating ground vibration, nonlinear multiple regression (NLMR) technique was also performed using the same datasets. The results demonstrated that the proposed model is able to predict blast-induced ground vibration more accurately than other developed technique. Coefficient of determination values of 0.914 and 0.874 for training and testing datasets of GEP model, respectively show superiority of this model in predicting ground vibration, while these values were obtained as 0.829 and 0.790 for NLMR model. 相似文献
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盾构近距离下穿对已建地铁隧道的位移影响及施工控制 总被引:2,自引:0,他引:2
通过对盾构近距离下穿杭州地铁1号线已建隧道施工过程进行监测,针对盾构近距离、小角度下穿对已建隧道位移的影响过程和特点,研究了盾构机与已建地铁隧道相对位置关系不同时,已建隧道的隆沉、水平位移及收敛位移变化规律。对盾构参数进行实时记录,通过反馈的已建隧道位移监测进一步优化盾构施工参数,合理盾构参数的设置可以有效控制既有隧道变形在允许范围内。已建隧道变形规律显示,盾构隧道在距离已建隧道20 m以外工况下,对上部已建隧道影响很小;盾构整个过程中已建隧道穿越交叉点竖向和水平位移变化过程大致经历5个阶段。 相似文献
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Mahdi Hasanipanah Danial Jahed Armaghani Hassan Bakhshandeh Amnieh Mohammadreza Koopialipoor Hossein Arab 《Geotechnical and Geological Engineering》2018,36(4):2247-2260
Flyrock is an adverse effect produced by blasting in open-pit mines and tunneling projects. So, it seems that the precise estimations and risk level assessment of flyrock are essential in minimizing environmental effects induced by blasting. The first aim of this research is to model the risk level associated with flyrock through rock engineering systems (RES) methodology. In this regard, 62 blasting were investigated in Ulu Tiram quarry, Malaysia, and the most effective parameters of flyrock were measured. Using the most influential parameters on flyrock, the overall risk of flyrock was obtained as 32.95 which is considered as low to medium degree of vulnerability. Moreover, the second aim of this research is to estimate flyrock based on RES and multiple linear regression (MLR). To evaluate performance prediction of the models, some statistical criteria such as coefficient of determination (R2) were computed. Comparing the values predicted by the models demonstrated that the RES has more suitable performance than MLR for predicting the flyrock and it could be introduced as a powerful technique in this field. 相似文献
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