为解决青龙煤矿11615回采工作面上隅角瓦斯浓度超限难题,结合该工作面实际瓦斯赋存情况,采用高位定向长钻孔瓦斯抽采技术方法开展瓦斯抽采.对比了瓦斯抽采效果与钻孔距回风巷距离远近的关系,研究了瓦斯抽采效果与回采里程的关系,总结了高位定向长钻孔的瓦斯抽采规律.研究结果表明:回采过程中,通过高位定向长钻孔抽采采空区上覆岩层瓦斯,回采工作面上隅角瓦斯浓度降低到0.25％～0.35％,解决了该采空区上隅角瓦斯浓度超限问题;钻孔距回风巷距离为40 m时,抽采瓦斯浓度基本稳定在18.5％左右,抽采效果最佳;随着回采里程的增加,钻孔抽采效果呈上升趋势,但在抽采末期有所下降.说明高位定向长钻孔对降低采空区及回采工作面上隅角瓦斯发挥了一定作用,提高了回采过程中瓦斯治理效率.

针对高位钻孔瓦斯抽采存在钻孔数量多、单孔深度不足、钻孔轨迹不可控、瓦斯抽采浓度较低、抽采不连续等问题,为有效防治青龙煤矿 21602工作面回采期间上隅角瓦斯浓度超限,利用高位定向钻孔技术对瓦斯进行抽采,介绍了高位定向钻孔设计施工方案,通过现场实践确定了最佳钻孔布置参数.结果表明:高位定向钻孔具有瓦斯抽采浓度高、抽采量大、抽采率高等特点,且高位定向钻孔瓦斯抽采效果随工作面回采距离的增加呈先稳定后下降的趋势;当高位定向钻孔终孔层位距离顶板 39 m、距离回风巷右帮水平位移为 55 m时,瓦斯抽采体积分数达 30.5％,瓦斯抽采流量达 18 m3/min,瓦斯抽采流量达 2.374 m3/min,瓦斯抽采效果最佳;上隅角瓦斯体积分数由抽采前的最大值 0.72％降低至抽采期间的 0.2％-0.4％,有效解决了上隅角瓦斯浓度超限问题.

Aiming at the support difficulties of mine galleries under the complex geological conditions of high buried depth, high in situ stress and tectonic fractured zones, a novel square-steel-confined-concrete (SSCC) arch centering supporting system is proposed in this paper. To validate the feasibility of this supporting system, a uniaxial compression test on an SSCC short column is performed and the results illustrate that it has better ductility and higher bearing capacity than the U-shaped column. Numerical analysis on the mechanical behaviors of SSCC arch centering is conducted considering three factors of core concrete strength, steel tube thickness and confinable effect coefficient. Two influence indexes of steel tube thickness (mu(t)) and core concrete strength (mu(c)) influencing the ultimate bearing capacity are put forward and mu(t) has more significant influence. Therefore, an SSCC arch centering (side length 150 mm, tube thickness 8 mm and filled C40 concrete) is determined to perform laboratory and in situ experiments. Combined with numerical simulations, the deformation failure behaviours of the SSCC arch centering are eventually obtained. The laboratory experimental results show that the maximum deformation appears near the spandrel of the arch centering and the ultimate bearing capacity is 1286.9kN. An SSCC and a U-shaped arch centerings have been simultaneously used in the supporting system of the gallery in Zhaolou coal mine project, and the monitoring results (after 157 days) show that their average displacement of the SSCC arch centering is 10.33 mm, which is only 18.3% of that obtained in the U36 arch centering. The above research results indicate that this kind of SSCC arch centering supporting system could efficiently control the deformation of the surrounding rock mass in mining galleries.

In order to solve the problem in deep rock roadway and roadway with structural fracture zone, a new support form, i.e. U-type confined concrete(UCC) arch centering, was developed.The bearing and deformation characteristics of the arch centering were researched experimentally, and the key position of the arch centering failure was confirmed. Finally, the action principle of the support system was analyzed. The results show that UCC short columns have better ductility and post-bearing capacity, and the ultimate beating capacity is increased by 127%—196% compared with that ofU-steel short columns, which shows that the ultimate beating capacity of UCC short columns is 2.16 times that of U-steel arch. UCC arch centering is a three-dimensional support system, the surrounding rock control effect is significant, and the maximum deformation of roadway surrounding rock is 53 mm under UCC arch centering, only 20.6% of that of U type steel arch frame. UCC arch centering can provide high support, guaranteeing the safety of supporting system effectively.

针对深井高应力巷道支护难题,基于常规U型钢拱架设计了一种U型约束混凝土(UCC)支护系统.为明确支护系统核心构件UCC拱架的力学性能及变形破坏机制,采用自主研发的地下工程约束混凝土拱架1:1力学试验系统,并结合数值计算方法,开展了系统的试验研究.结果表明,均压加载条件下,室内试验UCC29拱架的屈服荷载为1 230 kN,极限荷载为1 310 kN,数值模拟与室内试验结果相差仅为8.86％和12.5％,拱架整体呈现"拱顶上升,拱腿内敛,整体变瘦高"的变形形态,最大变形部位在拱腿中部至起拱点位置.拱架变形破坏机制为局部强度破坏造成拱架整体失稳.现场应用效果显示,UCC拱架具有显著的围岩控制效果,为深井高应力巷道提供了一种新型支护形式.

本发明公开了一种矿井降温和供热系统，该系统既能实现矿井降温，从而降低热害影响，也能够实现矿井的供热，从而实现矿井防冻。 本方案提供的装置，利用矿井水作为冷源或者热源，对送入井口的空气进行降温或者供热处理，使得送入矿井内的空气达到设计要求，实现整体改善矿井空气温度和湿度的目的，相对于现有技术中在矿井内的工作地点进行局部降温的处理方式，可以在整体上改善矿井内的环境，有效降低矿井热害影响或者实现矿井防冻。

DDARF (discontinuous deformation analysis for rock failure) method was used to research the roadway along goaf of 11302 workface in Zhaolou Colliery. In order to get its failure deformation and control mechanism, DDARF was first used to analyze the crack propagation of single joint anchored specimen under uniaxial compression, then the stimulation result of real roadway was compared with monitoring data from geomechanical model test and field test, to verify its correctness. The focus was on the crack evolution law of surrounding rock in the roadway along goaf. In order to quantitatively analyze the crack evolution in DDARF calculation, two indexes of R-c (crack ratio) and R-r (crack reduction ratio) were defined. Research results showed that the DDARF simulation results were consistent with uniaxial compression test of single joint anchored specimen. In the DDARF calculation of surrounding rock deformation in the roadway driving along goaf, it was shown that the deformation of coal side next to goaf was the largest, followed by roof and integrated coal side, floor was the least, and the monitoring data from model test and field test were both consistent with the result. According to the two indexes R-c and R-r, quantitative analyses was conducted to compare the crack evolution of non-anchored and anchored roadways, and the result was consistent with the deformation trend that is R-cI > R-cII > R-cIII > As the surrounding rock had been seriously crushed, although supporting scheme was effectively, the max crack ratio R-cI with anchor supported was still 2.13 times of the R-cIII . In order to maintain the stability of surrounding rock, the key parts of zone. and zone. should be strengthened besides asymmetric supporting with anchors. For the stimulate result was closer to actual engineering, DDARF method could not only be used to research crack evolution and failure deformation, but also guide countermeasure to control these roadways effectively.

Determination of reasonable coal pillar width is key for ensuring stability of surrounding rock of fully mechanized caving roadway driving along next goaf. Taking track roadway of 11302 workface in Zhaolou colliery as the engineering background，a new side abutment pressure monitoring method was proposed；and the reasonable coal pillar width was determined by using the method of field stress monitoring and numerical simulation. Field stress monitoring and numerical analysis results show that the influence scope of workface side abutment pressure is 50–56 m，and low stress zone width is 12–15 m，considering pillar stress environment，pillar width should not be larger than 7–10 m. Meanwhile，considering being propitious to bolt anchoring，width of coal pillar should not be less than 4 m. Various elements such as coal pillar stability，secondary disaster control and resources recovery were considered comprehensively. Finally，the reasonable width of segment pillar is determined as 5 m. Reasonable pillar width is verified by using large-scale geomechanical model test and field test. Monitoring results show that variation of surrounding deformation along the empty wall is largest，followed by roof and entity wall，floor is least. After roadway driving along next goaf stability，roof to floor convergence is 271 mm；two walls convergence is 359 mm；the effect of roadway surrounding rock is well. Bolts and anchors forces are in their yield range；and set aside a sufficient margin for the recovery period. The results can provide a reference for segment pillar setting in other mines with similar mining conditions.

According to field investigation and deformation monitoring of roadway driving along goaf in fully mechanized top coal caving face in Zhaolou mine, failure characteristics of roadway surround-ing rock have been analyzed and its deformation failure mechanism has been deeply revealed. Results indicates that low surrounding rock density, high in-situ stress, large destruction scope, unreasonable supporting structure and parameters, complex stress environment and large section size are the main reasons of surrounding rock failure and deformation. Based on control principle of intensive-yielding-coupling support and key parts reinforced support, supporting measures of roof bolt net strip cable, lon-gitudinal strip+two sides anchor net ladder cable, longitudinal steel ladder+narrow coal pillar cable reinforcement and gunite+entity coal side drilling to relief stress are proposed. In addition, field test has been implemented. After roadway driving along next goaf stability, the effect of roadway surround-ing rock is good. The maximum force of bolts and anchors are within their yield range, and set aside a sufficient margin for the recovery period. The results can provide a reference for similar complex and difficult supporting roadway.

In order to research the surrounding rock deformation and failure mechanism of deep thick top coal roadway, taking Zhaolou coal mine in Juye mining area as engineering background, a large scale model test is carried out, the stress and displacement evolution laws of surrounding rock supported by pressure relief anchor cable box beam supporting programs are researched. And the results show: the vertical stress release is more intense in roof and floor of the roadway than that in the side wall, while the horizontal stress is the opposite; central of roadway roof is the main position of vertical stress release. By being compared with field test results, three main deformation and failure characters of the surrounding rock of deep thick top coal roadway are summarized: the deformation and failure of roof is more serious than that of side wall and floor; deformation and failure of roadway roof occurrs mainly in the coal below coal-rock interface; central of roadway roof is the key position of the deformation and failure. The corresponding mechanism is analyzed: the factors such as soft and broken features of roof coal, its poor self-supporting ability, vertical stress releasing more severe in roof and its central, poor force state of rectangle roadway, cause low radial stress of surrounding rock in roof, serve bulking deformation, bending deformation and roof separation, and worsen the roof force structure, finally, they lead to controlling trouble of roadway roof.

By accident investigation,theoretical analysis and field measurement,this paper studies the occurrence mechanism,control methods,the risk′s regionalization and grading evaluation method of abnormal weighting in fully mechanized/caving face of deep shaft.Following results are obtained :(1) The main affecting factors of abnormal weighting in working face are roof weighting,roof water,roof control distance increasing,low setting load,mining height change,fault,advance speed and the superposition of these factors.(2) The occurrence mechanism of abnormal weighting was the imbalanced relationship between roof structure and support,which caused by these factors and result in roof abnormal activities and support subjected to abnormal forces.(3) The control methods of abnormal weighting are evaluated before mining,pretreatment risk area,implement mine pressure observation in the process of mining,reducing the risk by using roll steering working face,reduce mining height properly,improving setting load,draining water or strengthening the roof in advance,pre-splitting roof,accelerating advance speed and optimizing support resistance,ect.The research results have been applied to Zhaolou coal mine coal face 1306 with a good result,so as to avoid the support crushing accident effectively.

The current situation of coal roadway support,especially pressure relief support theory and technology,was summarized.The necessity and engineering significance of the support idea,which is controlling at first,pressure yielding behind and then resistance,was researched.Guided by the support idea,and considering the demand of deep high stress coal roadway support,high strength pressure relief anchor box beam support system was developed,and the high strength pressure relief performance of the system was analyzed,and the function and mechanical property of box supporting beam,yielding link and other combined members were researched.The contrastive analysis with channel steel and I-beam indicated that box supporting beam had the advantage of high strength and stiffness,high-level economical efficiency,good surface protection effect and load-transmitting performance.The result of uniaxial compression test showed that the yielding link had unique second order determinant pressure relief performance,high pressure relief point,long pressure relief distance and good pressure relief stability.The supporting system has the advantage of multiple compound mode,wide area of application and easy application.Based on geological condition of 3302 headentry in Zhaolou coal mine,high strength pressure relief anchor box beam support scheme was designed and simulated.Result shows that the new scheme is better than the original,achieving good support effect in the test section of headentry.

数码载波控制在采煤机上应用是一种全新概念,利用动力载波传输控制信号改变了采煤机传统控制方式,比传统多芯电缆控制方式节省电缆资金;特别是在消除控制线高事故率上具有显著优越性。

Based on the gas data during geological exploration and mining period,combined with experimental results of adsorption constant,porosity and industrial properties,the paper analyzed the factors affecting gas occurrence from coal properties to coal-forming environment and geological structures by using methods of gas-geology;and it pointed out that,though the coal-forming environment is conducive to gas occurrence,the geological structure is the controlling factors causing low gas occurrence in No.3 coal seam.Under the special condition,gas occurrence should be analyzed with geological background concretely.

Rock-burst disasters are more and more frequently under the influences of complicated geological conditions in recent years.There were several serious floor rock-burst in areas of igneous rock floor in the first working face of Zhaolou coal mine.This paper analyzed the causes of rock-burst induced by igneous rock.The paper pointed out that the high rigidity and the high horizontal stress which cased by hard igneous rock were the main causes of floor rock-burst.The control mechanism and prevention methods were presented.This paper brought forward some specific and customized prevention measures of floor rock-burst on intrusive igneous rock floor in the first working face of Zhaolou coal mine.The site engineering practice gained favorable results.

In order to solve the problem of the high dust concentration which caused by the speeded advance of coal road using the ABM20 development machine,a kind of method which was suitable to China's speeded advance of coal road was proposed.By using the mathematic model method to contrast the wind current field,dust field of the drivage face which using the enclosure dust-laying system under different drivage velocity,an optimized drivage velocity of the fully-mechanized development machine was got.On the optimized drivage velocity,put their theories into industry experiment.On the analysis of the data which collected by the experiment,the result indicates that the enclosure dust-laying system proposed can significantly lower the dust concentration of the heading face.Also it has some advantages in the accomplishment of the effective advance of coal mines.

将采空区视为多孔介质,采用流场理论建立采空区风流移动规律数学模型,模拟当进风风速不同时,采空区自然发火火源点位置分布规律.

2001-2007年,鲍店煤矿共发生5次矿震,严重影响矿井安全生产,据此,文章分析了矿震危险区域并针对危险区域提出了相应的措施.对鲍店煤矿大面积采空区采取气体管理和采取高强度充填密闭和外部柔性密闭墙的2道密闭的永久封闭技术措施,共施工83道密闭,其中新建57道,加固26道,有效提高了大面积采空区密闭的安全可靠性,优化了通风系统,减少了漏风通道,杜绝了自然发火和矿震摧毁密闭事故的发生,保证了矿井安全生产.

针对目前综掘面在采用综掘机内、外喷雾及抽出式除尘风机整体除尘效果不理想的情况,提出了综掘面封闭式除尘系统,该系统利用空气幕控尘原理有效地将粉尘控制在掘进机前方,且设备布置简单、操作方便;根据综掘面的产尘规律和设备、工艺特点,优化了空气幕喷嘴位置和数量、除尘风机吸尘口位置等参数;通过现场应用,验证了该封闭式除尘系统的设计科学、合理,能有效地降低综掘面的粉尘浓度.