玻璃钢锚杆的可靠性分析及应用

基于玻璃钢锚杆在巷道支护中的力学特性以及工程可靠度计算模型,确定了回采巷道顶板和两帮玻璃钢锚杆的支护状态方程和可靠度计算方法。结合金山店铁矿回采巷道的具体支护问题,通过蒙特卡罗直接抽样法计算出玻璃钢锚杆的可靠度为0.9015,满足矿山回采巷道支护工程可靠性要求,为玻璃钢锚杆在金属矿山回采巷道中的应用提供了科学依据。     

基于地压诱导致裂的高应力硬岩矿床优化回采数值模拟(英文)

采用离散元数值模拟分析软件3Dec,依据贵阳开阳磷矿深部硬岩矿床的工程实际情况建立三维数值模拟模型,对开阳磷矿深部硬岩矿床的3种不同开挖工况进行模拟计算,包括在矿体中开挖地压诱导致裂巷道及不同方向(水平向和竖向)、不同顺序(先上后下/先下后上)开挖后的巷道围岩体的位移和塑性区分布情况。结果表明:在矿体中开挖诱导致裂巷道时,巷道周边岩体塑性区和位移场随着暴露时间的延长而不断增大,矿岩朝着有利于破碎的趋势发展,即为掘进机的高效切割回采提供了有利条件;不同开挖方向对充分利用深部地压效果不同,竖向开挖比水平横向开挖可形成更大的位移场和塑性破坏区,地压致裂的效果更明显;先下后上式开挖比先上后下式开挖产生的临空面附近矿岩产生更大的变形量和破坏区,更能有效地利用深部地应力破岩。该研究对开阳磷矿深部高应力硬岩矿体非爆掘进机连续开采的采矿方法设计、充分利用地压破岩和合理确定开挖方式具有重要的意义。     

宏远煤业沿空送巷泄压消突技术的研究与应用

针对低透气性难抽单一煤层的煤与瓦斯突出矿井,通过沿采空区水平卸压带掘进巷道防止煤与瓦斯突出,实现快速掘进,保证了巷道安全和工作面正常生产,实现了高产高效,降低了瓦斯治理的成本。     

翻车机房深基坑土方分层机械化施工技术

长兴电厂四期技改项目输煤系统的翻车机房基坑开挖深度17.6m,采用分层开挖的机械化施工,选用合理的出土坡道,预留皮带机廊道土方最后开挖,实现了安全快速开挖,取得了较好的施工效果。     

Cutting parameter optimization for one-step shaft excavation technique based on parallel cutting method

The outcome of the cutting blasting in a one-step shaft excavation is heavily related to the cutting parameters used for parallel cutting method. In this study, the relationships between the cutting parameters (such as the hole spacing L and the empty hole diameter D) and damage zones were investigated by numerical simulation. A damage state index γ was introduced and used to characterize the crushing and crack damage zones through a user-defined subroutine. Two indices, i.e., η₁ and η₂ that can reflect the cutting performance, were also introduced. The simulation results indicate that an optimal value of L can be obtained so that the η₁ and η₂ can reach their optimal states for the best cutting performance. A larger D results in better cutting performance when the L value maintains its best. In addition, the influences of the loading rate and the in-situ stress on the cutting performance were investigated. It is found that an explosive with a high loading rate is suit for cutting blasting. The propagation direction and the length of the tensile cracks are affected by the direction and the magnitude of the maximum principal stress.     

3D finite element numerical simulation of advanced detection in roadway for DC focus method

Within the roadway advanced detection methods, DC resistivity method has an extensive application because of its simple principle and operation. Numerical simulation of the effect of focusing current on advanced detection was carried out using a three-dimensional finite element method (FEM), meanwhile the electric-field distribution of the point source and nine-point power source were calculated and analyzed with the same electric charges. The results show that the nine-point power source array has a very good ability to focus, and the DC focus method can be used to predict the aquifer abnormality body precisely. By comparing the FEM modelling results with physical simulation results from soil sink, it is shown that the accuracy of forward simulation meets the requirement and the artificial disturbance from roadway has no impact on the DC focus method.     

浅析巷道快速掘进影响因素

指出河曲县煤矿平巷掘进的现状及与国有重点煤矿现状的差距,并分析出影响巷道快速掘进的因素,并探讨了煤矿平巷掘进今后的发展趋势,以提高平巷施工技术,加快掘进速度。     

基坑围护中SMW工法的应用

结合工程实例,简要介绍了基坑围护结构SMW工法在施工过程中的各施工要点及该施工工艺的特点。     

近距离煤层群开采下巷道稳定性研究

考虑到回采巷道所处煤层群中的空间位置,综合分析上下煤层、邻近工作面及煤柱留设对巷道的影响,对崔家寨煤矿503工作面机巷以及相邻的505工作面机巷出现的冒顶等一系列巷道失稳问题进行了分析研究,对巷道的布置,煤柱宽度的留设及锚杆支护参数进行了分析,并给出了合理的建议,为今后现场施工提供了依据.     

东庞矿水淹巷道构造破碎带高冒区加固技术

为了解决东庞矿水淹巷道局部出现的围岩破碎、片帮冒顶的问题,结合现场具体地质条件,提出了采用锚杆、锚索+高分子化学注浆材料加固技术处理冒落区,通过改变巷道围岩结构提高岩体的整体强度。采取加固技术后,每班的施工进度由0.5 m提高到了1.5 m;采取加固技术比采用绕道法多回收煤炭资源5000 t。