The aim of this study is to resolve the present control problems and the corresponding high-strength anchor cable control technology in deep large section roadways. This study was based on the Hoek-Brown criterion and the upper bound theorem of the limit analysis and also considered the stress of surrounding rock in the roof and the effect of supporting the load. On the above basis, the roof caving mechanism of large-section roadways was acquired. Furthermore, a design method for roofs was put forward for the minimum length and the pre-tightening force of an anchor cable. Since the design parameters of anchor cables was affected by established sensitivity indexes, it is important to investigate the effects of established sensitivity indexes on factors, such as the roadway's width, the specific weight of the rock mass, the stress in the surrounding rock, the compressive strength and the tensile strength of the rock mass, anchor cable layout spacing and vertex anchor cable laying angle. According to the actual field conditions,engineering suggestions are proposed for controlling surrounding rocks in the deep large-section roadway. Finally, this design method was applied to determine the roof anchor parameters of transport gateway of 1305 Island Coal Face in the Kilometer Deep Well Zhaolou coal mine, which effectively controlled the deformation of surrounding rock. From research results, only when the roof anchor cable was anchored in stable rock and enough pre-tightening force was exerted, the roof rock caving and damage can be effectively controlled in high-stress large-section mining roadways. It is found that roof pre-tightening force for anchor cable decreased with the increase of tensile strength, compressive strength and empirical parameter A of rock mass. Besides, this roof pre-tightening force increased with increasing the width of the roadway, the specific weight of rock mass, the stress in the surrounding rock, the compressive strength and the tensile strength of rock mass, anchor cable layout spacing, vertex anchor cable laying angle and empirical parameter B of rock mass. Moreover, the highest sensitivity of all the influencing factors turned out to be the surrounding rock stress. This indicates that special attention should be paid to the influence of in-situ stress of the surrounding rock when designing the deep high-stress roadways. Therefore, the effective release of the surrounding rock stress can be achieved by using the high strength, high elongation anchor cable and adding the yieldable device. Meanwhile, the integrity of the surrounding rock can be improved by applying high pre-tightening force and grouting reinforcement, resulting in better control performance of surrounding rock.

本文运用理论分析,数值模拟,工程应用为手段研究了深井软弱破碎围岩的支护问题,提出了平衡支护技术,分析了围岩与支护体相互作用的机理.

In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support is proposed to solve these problems. A calculation theory is established on the bond strength of the interface between the anchoring agent and surrounding rocks. An analysis is made on the influence law of different mechanical parameters of surrounding rocks on the interfacial bond strength. Based on the research, a new high-strength bolt-grouting technology is developed and applied on site. Besides, some helpful engineering suggestions and measures are proposed. The research shows that the serious deformation and failure, and the lower bond strength are the major factors causing frequent failures of bolt support. So, the bolt could not give full play to its supporting potential. It is also shown that as the integrity, strength, interface dilatancy and stress of surrounding rocks are improved, the bond strength will increase. So, the anchoring force on surrounding rocks can be effectively improved by employing an anchoring agent with high sand content, mechanical anchoring means, or grouting reinforcement. The new technology has advantages in a high strength, imposing pre-tightening force, and giving full play to the bolt supporting potential. Hence, it can improve the control effect on surrounding rocks. All these could be helpful references for the design of bolt support in deep underground mines.

The invention discloses a mining influence tunnel dynamic monitoring and stability evaluation method which comprises the following steps: step 1, arranging a high-precision micro-seismic monitoring system and an introscope; step 2, collecting data before mining influence; step 3, collecting data after mining influence, wherein the specific implementation steps of the step 3 are the same as those of step 2; step 4, analyzing the stability of surrounding rock, namely respectively calculating to obtain a surrounding rock rupture range increase rate, a surrounding rock rupture energy increase rate, a surrounding rock rupture event unit volume density increase rate and a surrounding rock rupture degree increase rate based on a surrounding rupture position, surrounding rack rupture energy, surrounding rock rupture times and surrounding rock rupture degree before and after mining influence; step 5, quantitatively evaluating the tunneled tunnel stability below a coal pillar of mining influence, namely, based on surrounding rock evaluation values obtained in the step 4, establishing quantitative evaluation indexes of tunnel tunneling stability under mining influence by use of a weight analysis method, and performing quantitative evaluation on the tunneled tunnel under mining influence.

The coal seam of Zhaolou Coal Mine lies in the second stage thermal hazard zone .The underground cli-mate environment of high temperature and high humidity produces excessively high thermal stress , which can de-stroy the thermal balance of human body , make people feel uncomfortable , lead to the increase of accidents and the decrease of productivity , thus influence the work safety of coal seriously .On the basis of establishing the central-ized cooling in underground mine , the maximum air volume cooling system and method were put forward aiming at the characteristics of seasonal thermal damage .The cooling load of mine was determined through the air temperature prediction under the effect of multiple thermal sources .Through establishing ground centralized maximum air vol-ume cooling technology in mine , the cooling processing on air blowing into the wellhead was realized by using the water-source heat pump unit .The mine ventilation environment was improved on the whole , and the good results were achieved .

为研究不同锚固长度对巷道围岩的控制效果,从理论方面推导了锚杆应力分布规律,建立了不同锚固长度下巷道围岩力学分析模型,考虑分析了锚杆直径、围岩强度参数、锚固长度、预紧力、布设间距等影响因素,给出了巷道锚杆支护设计的工程建议措施,并通过开展现场试验验证了本文理论研究成果的正确性.研究表明:锚杆受力主要集中在锚固段端头1/3范围内,且沿长度方向杆体剪应力与轴力不断递减;在软岩中更利于锚杆锚固作用的发挥;施加高预紧力,并留设一定的自由段长度,有利于锚杆预紧力在围岩中扩散,可形成有效的锚固围岩承载结构,充分发挥杆体支护潜力;当锚杆布设间距较大时,可通过提高预紧力、适当减少锚固长度来增加预紧力对围岩的控制效果.

In order to study the characteristics of the deep shaft full-mechanized caving mining abut-ment pressure distribution, field measurement focusing on vertical stress has been carried out by using microseismic and online stress monitoring system at 1306 working face in Zhaolou mine.The research shows that the process of workface extracting can be divided into three stages: initial mining stage,“square stage”and normal mining stage. Advanced abutment pressure of the“square stage”exists three parts, that is the initial affect range, significantly affect range and severe affect range. The initial and normal mining stage has no obvious rising stage. The abutment pressure affect scope and the peak stress of the“square stage”are 1.5-1.7 times higher than those of the other two stages. According to the char-acteristics of abutment pressure distribution, reasonable advance support distance and controlling meas-ures of different recovery stages were determined.

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.

针对兖煤荷泽能化公司赵楼煤矿高温热害问题,提出了高温热害矿井综合治理方法途径,并对其综合治理效能进行了综合评价和分析,指出了其中的问题和不足,明确了今后高热害治理的方向.

To investigate the support of semicircle arched roadway,the roof failure mechanism,considering surrounding rock stress and bolting support,was constructed based on nonlinear Hoek-Brown failure criterion,and a simplified method for designing the pre-tightening force of roof bolts at the early stage after roadway excavation was proposed based on upper bound method. In addition,the recommended engineering measures were also provided accordingly,and the supporting effect of bolts with high strength and high pre-tightening force was verified through a field application. The results show that only imposing enough pre-tightening force after roadway excavation can effectively prevent roof falling. With the improvement of the strength parameters of rock mass,the required pre-tightening force of single rock bolt decreases,while increases with the increases of bolt spacing and surrounding rock stress. Adopting bolting support components with high strength,high tenacity and imposing high pre-tightening force,or adopting grouting reinforcement in soft,loose and broken surrounding rock can obtain more ideal control effects.

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。

Aiming at the surrounding rock control problem of roadway driving along goaf in coal seam with outburst-proneness,based on the stress controlling and support system designing,the rockburst weakening mechanism is proposed.According to the analysis of the failure characteristics and influencing factors of the roadway driving along goaf in the seam with outburst-proneness,the comprehensive measures are adopted including designing reasonably pillar's width to reduce surrounding rock stress,creating soft interlayer to release wall rock stress and absorb impact energy,and using high-performance bolting support technology system to enhance the strength of surrounding rock support structure,which can realize the effective control on the roadway driving along goaf in coal seam with outburst-proneness.

According to the microseismic events,the degree of strata behaviors and the monitoring results of drilling method in the stoping period of Jining No.3 coal mine 163 under 05 working face,this paper points out that the changes of advance velocity can affect the releasing process of vibration energy around the face to some extent.The number of daily vibration is smaller and vibration energy is lower when the daily progress of propulsion in the working face is 4.8 to 5.6 m.This paper also tries to discover the interactions between the footage of stoping face and rockburst by analyzing their relationships,and studies on the relationships between the occurring of microseismic events and advance velocity,on the basis of preventing rockburst disasters,determines the reasonable advance velocity of face and proposes a standard to prevent rockburst,which treats footage of stoping as one of the standards.Thus it can give guidelines to the later production phase of working face in the same level and same mining district and provide guarantees to make sure the production safety of coal mine.

The invention provides the technical scheme of a loading conveying line used for a mine laneway. The invention is characterized in that a bucket loading machine used for the mine laneway is connected with a bridge type reversed loading machine, an unloading end of the bridge type reversed loading machine is connected with out-conveying equipment, the bucket loading machine used for the mine laneway is provided with a base assembly provided with a hydraulic pedrail walking mechanism, a chain scrapping plate conveyer driven by hydraulic pressure is arranged on the base assembly, the front end of the base assembly is provided with a portal frame which spans across the conveyer, the upper part of the portal frame is provided with a rotary hinging and connecting seat driven by a rotary oil cylinder, a rotary disc is connected with the rotary hinging and connecting seat, the rotation of the rotary disc is driven by the rotary oil cylinder, a large arm and a large arm oil cylinder are hingedon the rotary disc, a small arm and a small arm oil cylinder are hinged on the large arm, a digging bucket and a digging bucket oil cylinder are hinged on the small arm, a crushing device is also arranged in the small arm, a control table, an operator chair and an output connecting frame are also arranged on the base assembly, and the out-conveying equipment can be a belt conveyer or a shuttle-type mine car or a plurality of groups of mine cars.

为解决浅埋煤层大采高工作面矿压控制问题,对内蒙古某矿6-2101首采工作面进行现场实测.通过对顶板活动规律和来压机理的分析,揭示了该矿6-2101首采工作面的矿压显现规律,认为该大采高工作面的初次来压,周期来压步距对相同条件下煤层开采具有理论和实践指导意义.更多还原

The paper discovered the feasibility of the upward mining technology to the top coal caving mining condition in thick seam for the mine sustainable development.According to the geological conditions of the No.4 mining block in No.3 Jining Coal Mine,with the numerical calculation,theoretical analysis,site measured statistical analysis and industrial trial,the paper had a research on the development features of the failed sub-zone in the strata above the goaf and discussed the feasibility of the upward mining technology under the top coal caving conditions.The paper fully analyzed and solved the upward mining problem under the top coal caving in the thick seam of No.3 Jining Coal Mine.The research results showed that the height of the falling zone from the theoretical calculation and the site measurement ware basically the same and were 14.5～19.15 m and 18.6～21.7 m individually.The numerical simulation analysis showed that the fissure zone at the No.3B seam was within the fissure zone after the coal mining operation of the No.3 seam and the continuity of the seam was well kept.

Based on the surrounding rock geological conditions of fully mechanized coal face with sublevel caving and hard roof under fault affected zone in the Jining No.3 Coal Mine,the supporting parameters of rebar-bolt and cable-belt supporting for the gob-side tailgate with narrow pillar were designed.With roof-strata-separation instruments and berehole-peep ones,the law of strata behaviors as follows was systematically studied in the process of the driving tailgate.Roof convergence and roof strata separation between inside and outside anchored zone were much smaller.The affected zone in the process of the driving tailgate was about 50 meters.Because of serious floor heave and obvious two ribs convergence,tailgate cross-section has become reverse-trapezoid shaped from the original rectangle after tailgate deformation.Since there are many more joints and fissures in the pillar of the gob-side tailgate,the coal body was compressed into loose material with block structure from the elastic material with bedded structure.The tailgate cross-section could meet its service requirement and coal face advancement,which demonstrated that the industrial test on rebar-bolt and cable-bolt supporting was successful.Therefore the obtained results were widely applied in the gob-side tailgate of the coal faces in the JNCM.

针对无轨胶轮车运行中出现的发动机高温问题,结合多年运行的实践经验,分析了常见的原因,并提出了初步的解决方法。

针对济三煤矿北部辅运巷变形、破坏的状况,分析了巷道变形、破坏的主要原因,提出了对其治理的锚网、喷浆、注浆联合支护方案,并成功进行了实践,治理效果明显,取得了良好的技术经济效益。

济三煤矿由于采用无轮运输,在出矸施工工艺上,进行了胶带机取代胶轮车运输的可行性研究,同时对耙装机与胶带机之间的多种配套关系及配套设备进行确定,实现了普掘作业中矸石胶带化运输,解决胶轮车运输矸石效率低的问题.