共查询到20条相似文献，搜索用时 281 毫秒
1.
2.
张平 《淮南职业技术学院学报》2007,7(3):4-6
针对高应力软岩巷道修复问题,采用锚注—爆破对巷道进行卸压,通过注浆加固和合理选择爆破参数,将应力控制理论与新奥法支护思想有机结合,充分利用围岩自承能力支护围岩;爆破卸压改变了围岩应力自然调节过程,改善了围岩应力分布状态,支护结构上应力减小,可以采用较少的支护维护高应力软岩巷道的稳定;经试验,采用锚注—爆破修复巷道,取得了明显的修复效果。 相似文献
3.
朱乐章 《淮南职业技术学院学报》2004,4(1):22-24
朱庄煤矿巷道主要支护形式有砌碹、架棚、锚喷等。由于该矿是一个已开采了40多年的老矿井且进入到深水平开采，地应力增大，地质条件复杂，巷道修复工作量大且支护效果不甚理想。锚注支护是一种主动支护，能防止围岩风化，使围岩形成一个整体，提高支护结构的完整性，扩大支护结构的适应性。锚注支护施工简单，操作性强。朱庄矿引进锚注技术，巷修工作效果显著。 相似文献
4.
孙道胜 《淮南职业技术学院学报》2004,4(3):1-2
淮南潘一矿东二13槽岩石轨道下山属典型的软岩层巷道，采用单一高强度U型棚支护存在巷道变形快，不能有效地维护巷道；采用架、锚注联合支护方式替代原有单一的架U型棚支护的方式，增强巷道支护强度，降低了巷道返修率，保证了采区的正常生产接替和通风运输安全。 相似文献
5.
大断面软岩交岔点锚索锚注联合支护技术 总被引：1，自引：0，他引：1
针对孔李煤矿孔井西四采区轨道下山交岔点岩性及实际破坏情况，为了永久地支护该交岔点，分析了其破坏原因及锚索锚注加固的机理，从加固围岩和提高围岩自身承载能力出发，针对围岩松散破碎，原有传统的补锚网喷修复方法效果不理想的实际情况，根据锚索和锚注的支护特点和应用范围，采用锚索锚注联合支护技术对其进行修复加固，修护后交岔点支护效果良好，取得较好的技术经济效果，该种联合支护方式对类似交岔点维修加固效果明显。 相似文献
6.
软岩开拓巷道过煤层断层时联合支护的应用 总被引：1，自引：0，他引：1
为了解决杨柳煤矿软岩开拓巷道过煤层和断层地段支护难的问题,提出了锚、架、注联合支护方案,实践证明这种支护方式很好的控制了巷道围岩的变形,保证了巷道的稳定性,满足了矿井的生产要求,且经济效益显著,具有推广应用价值。 相似文献
7.
赵晓艳 《淮南职业技术学院学报》2004,4(3):3-5
为了解决煤矿极不稳定岩层煤巷的有效支护和返修率较高的技术难题，以某矿的工程实践为例，从巷道围岩破坏以及锚注支护的机理人手，根据具体生产条件特点，选择采用锚注联合支护形式，对其方案设计、主要支护技术参数、施工工艺以及支护监测等方面的内容进行了阐述，并提出了施工时应注意的事项；采用该法，在生产实践中取得了较为显著的技术经济效益，有力地促进了煤矿安全生产工作。 相似文献
8.
梁文学 《北京工业职业技术学院学报》2005,4(1):33-35
在分析松软岩层的爆破破坏特征的基础上,根据光面爆破理论,结合工程实践,进一步优化与完善了光面爆破参数.并根据现场观测和理论分析,确定了锚网喷支护方案,优化了软岩支护参数,解决了松软膨胀岩石巷道支护存在的问题. 相似文献
9.
通过对百善煤矿649上提工作面机巷围岩物理力学和水理性质的分析测试，表明其具有“软、弱、薄、胀”四大风化软岩特点；根据组合梁拱和松动圈理论，进行了锚梁喷支护参数设计，并进行了工程实施；矿压监测结果表明，采用锚梁喷支护，既保证了巷道的稳定，又取得了较好的技术经济效果，为该矿全面推广煤巷锚杆支护奠定了良好基础。 相似文献
10.
韩新矿 《淮南职业技术学院学报》2006,6(3):8-9
淮南矿业集团顾桥矿井巷道断面大,岩性多变,为确保巷道快速施工,采用了锚网喷索注联合支护技术进行了支护改革试验。通过实践证明,该新型支护技术针对性,不但能将巷道围岩变形控制在允许范围之内,而且能解决巷道快速施工中的支护难题;它的成功应用为大断面岩巷快速施工提供了一种新的支护技术。 相似文献
11.
刀具材料对NM360材料钻削性能影响的研究 总被引：1，自引：0，他引：1
选择YG8硬质合金麻花钻、高速钢涂层麻花钻和普通高速钢麻花钻进行钻削性能对比实验,比较其刀具耐用度、切削力和扭矩,分析其工件形貌及去除机理等因素,实验证明：在相同钻削条件下,高速钢钻头的刀具耐用度最低,涂层高速钢钻头的耐用度最高。3种钻头在相同加工用量条件下,涂层高速钢钻头的轴向抗力最小,其次是硬质合金,高速钢的轴向抗力最大。但作为生产一线的工厂,钻削性能只是一个考虑的因素,从经济效益角度考虑,推荐使用硬质合金（高速钢YG8）麻花钻。 相似文献
12.
Micron grade Sn powder, VG32 oil and active pharmaceutical were mixed and the Nanometer Sn lubricant additives were prepared. Nanometer additives with different Sn concentrations were used in Steel-brass Tribo-pair for friction and wear test. The activating method to nano-Sn and surface of brass samples was investigated, and the method to form relatively thick friction coating on samples was discussed. Surface elemental distribution, coating thickness and its surface appearance were analyzed with X-ray photoelectron spectrum (XPS), auger electron spectrum (AES) and scanning electron microscope (SEM) respectively. The result shows that the ultra-thick friction coating (approx 20 μm), with abundant tin and well combined with substrate, has formed on the brass sample. The friction coating revealed superior performance of friction reducing and anti-wear properties. Therefore, the results possess practical significance to self-repair usage on steel-brass tribo-pair in mechanical systems. 相似文献
13.
Irradiated by infrared laser, the surface reducibility and adsorbability of Cu-Cr complex could be improved, owing to the interaction of photo-fragmentation and laser texturing. Analyzed by the binding energy spectra and the auger spectra, the valence states of chromium ion and copper ion were+3 and+1 after radiation respectively, which still had the reducibility to release electrons. In contrast with the near-infrared(NIR)1 064 nm and mid-infrared(MIR) 10 600 nm laser at the same average output power of 15 W, the reduced metal percentage in the Cu-Cr complex was obviously distinguished at the depth from nanometer to micron. After chemical plating, the average coating thickness and mean-square deviation of the NIR sample were 11.61 μm and 0.30 for copper layer, and 2.69 μm and 0.08 for nickel layer. The results were much better than those of the MIR sample. 相似文献
14.
福州市园林地被植物应用调查研究 总被引：1，自引：0，他引：1
采用实地勘查记录和档案资料整理的方法，对福州市区各类园林绿地中地被植物景观进行调查．总结其种类构成、应用形式，对主要地被植物的应用状况进行分析评价，认为福州市应加大引种驯化地被植物的种类并推广应用，优化配置形式，切实做到适地适树，科学养护。 相似文献
15.
通过计算确定地线的埋设方法 总被引：1，自引：0，他引：1
董宏 《雁北师范学院学报》2002,18(2):63-65
接地装置的接地电阻有严格的要求,不同埋设地线的方法会产生不同的接地电阻.通过计算表明,水平埋设LCP长效地线产生的接地电阻最小. 相似文献
16.
17.
Long-period ground motion has become an important consideration because of the increasing number of large and long-period structures. Therefore, a thorough investigation on the formation and characteristics of longperiod ground motion is desirable for engineering applications. In this work, an analytical study is performed to examine the effect of several parameters and the combining mode for equivalent harmonic components on the dynamic response of systems. The results of the work show that the harmonic components in equivalent ground motion are evidently influenced by the intensity rise time, duration, phase and combining mode. Moreover, the long-period ground motions are simplified and simulated by separate harmonic components through proper combination. The findings of the work are believed to be useful in the selection of input ground motion in structural seismic analysis. 相似文献
18.
Collapses of transmission towers were often observed in previous large earthquakes such as the Chi-Chi earthquake in Taiwan
and Wenchuan earthquake in Sichuan, China. These collapses were partially caused by the pulling forces from the transmission
lines generated from out-of-phase responses of the adjacent towers owing to spatially varying earthquake ground motions. In
this paper, a 3D finite element model of the transmission tower-line system is established considering the geometric nonlinearity
of transmission lines. The nonlinear responses of the structural system at a canyon site are analyzed subjected to spatially
varying ground motions. The spatial variations of ground motion associated with the wave passage, coherency loss, and local
site effects are given. The spatially varying ground motions are simulated stochastically based on an empirical coherency
loss function and a filtered Tajimi-Kanai power spectral density function. The site effect is considered by a transfer function
derived from 1D wave propagation theory. Compared with structural responses calculated using the uniform ground motion and
delayed excitations, numerical results indicate that seismic responses of transmission towers and power lines are amplified
when considering spatially varying ground motions including site effects. Each factor of ground motion spatial variations
has a significant effect on the seismic response of the structure, especially for the local site effect. Therefore, neglecting
the earthquake ground motion spatial variations may lead to a substantial underestimation of the response of transmission
tower-line system during strong earthquakes. Each effect of ground motion spatial variations should be incorporated in seismic
analysis of the structural system. 相似文献
19.
许永强 《赣南师范学院学报》2007,28(6):14-17
应用QCISD(T)/6-311++G(3df,3pd)和B3LYP/6-311++G(3df,3pd)方法,对AlC+和SiC+基态的分子结构和光谱属性进行了详细的理论计算.得到了AlC+和SiC+基态的能量,平衡结构,谐振频率.同时根据原子分子反应静力学原理,导出了AlC+和SiC+基态的合理离解极限和离解能.计算结果表明,AlC+和SiC+基态的光谱常数与现有的文献结果基本一致.部分光谱常数是第一次给出理论的报道. 相似文献
20.
在单旋翼涵道尾桨直升机的非线性全量飞行动力学数值模型的基础上,提出了求解配平问题的一种混合算法,研究了地面效应对配平的影响。以某直升机为算例,在无地面效应和考虑不同悬停高度时,分别进行了初始参数进行了配平,配平计算结果与地面效应的理论相符合。 相似文献