复杂"三下"矿山建设及开采的实践与探讨

高阳铁矿是一个较为典型的“三下”开采矿山,针对在建设和开采中遇到的诸多问题,提出了可行的安全生产工艺措施和采用浅孔留矿一嗣后充填采矿法,对类似条件的矿山建设和开采具有一定的指导意义。     

模糊网络博弈的合作联盟优化对策研究

模糊网络博弈主要关注如何将联盟收益分配给合作联盟的每个参与者,其广义模糊博弈解同时引入参与度和调整系数,不仅实现了参与者以部分资源参与合作联盟的愿望,而且满足了保留部分收益值用于联盟再发展的需求.本文作为模糊博弈模型的后续深入研究,对模糊网络博弈的解进行拓展,提出广义模糊核心解、广义模糊谈判集解的概念,并证明当满足超可加性的前提下,模糊网络博弈的广义模糊核心解与其广义模糊谈判集解具有等价关系,并刻画了模糊网络博弈广义核心解的非空性,算例分析结果表明合作联盟广义分配方案的存在性,为合作联盟优化对策提供服务.     

Experimental Study on Young′s Modulus of Concrete

Ｃｏｎｃｒｅｔｅｃｏｍｐｏｎｅｎｔｉｓｗｉｄｅｌｙｕｓｅｄｉｎｉｎｄｕｓｔｒｉａｌａｎｄｃｉｖｉｌｃｏｎｓｔｒｕｃｔｉｏｎｓ .Ｙｏｕｎｇ′ｓｍｏｄｕｌｕｓｉｓａｂｏｕｔｉｔｓｂａｓｉｃｍｅｃｈａｎｉｃｓｃｈａｒａｃｔｅｒｉｓｔｉｃ ,ｗｈｉｃｈｉｓｉｎｄｉｓｐｅｎｓａｂｌｅａｎｄｉｍ ｐｏｒｔａｎｔｆｏｒｓｔｕｄｙｓｕｃｈｐｒｏｂｌｅｍｓａｓｄｅｆｏｒｍａｔｉｏｎ ,ｅｘｐｌｏｓｉｖｅｗａｖｅａｎｄｅａｒｔｈｑｕａｋｅｗａｖｅ .ＴｈｅｒｅｌａｔｉｏｎｂｅｔｗｅｅｎＹｏｕｎｇ′ｓｍｏｄｕｌｕｓａｎｄｔ…     

Fractal characteristics of rock fragmentation at strain rate of 10^0 -10^2 s^-1

The fragmentation test of granite subjected to strain rate of 10^0 - 10^2 s^-1 was carried out using split Hopkinson pressure bar（SHPB） whose diameter is 75 mm, where half-sine loading waveform was performed. The sieving statistics results of the fragments show that the distribution of the fragments is a fractal, and the fractal dimension values fall into the range of 1.2 - 2.4. The correlation analysis between the fractal dimension and the logarithm of the energy density shows that they have approximately linear relation. Finally, based on damage theory and scale invariant principle, the fragmentation model with renormalization method was put forward, and the fractal dimension value predicted with the model was compared with the test results. It is found that the fractal dimension value obtained from the improved fragmentation model is more reasonable.     

Damage and fragmentation of rock under experiencing impact load

1 INTRODUCTIONThe dynamic fragmentation of brittle materialsexperiences an extremely complex process ,invol-ving micro-cracks nucleation,propagation and coa-lesce , which breaks the solid into fragments . Butthe process canfall into two successive phases gen-erally : damage stage and fragmentation phase .The most widely applied theoretical models of theprocess , such as those based on the pioneeringstudies of Grady[1], Glenn et al[2],involve sometype of relatively si mple global energy ba…     

沥青路面施工中离析的原因及其预防措施

文章对沥青路面施工中离析产生的原因进行了分析,并提出了相应的防治措施     

Damage and failure rule of rock undergoing uniaxial compressive load and dynamic load

1INTRODUCTION Naturalrockinlithosphereiscommonlyinthetri dimensionalstressstate,butthatofthewallrockaroundundergroundstructuresisoftentrans formedtouni dimensionalstatewhenundergroundstructureprojectsareputinpracticeororeisminedout.Butwhenthestressstateofrocktrans formsfromhighdimension stolowdimension s,ifcertainconditionsaresatisfied,rockburstwillpos siblyoccur[1].Inordertoinvestigatetherockburstoccurrencemechanism,theuniaxialloadingtestisoftencarriedouttosimulateapproximatelytherockburs…     

Monitoring technique for seepage line of tailings dam

2 .2　MonitoringdesignandbackfilltechniqueofMPPPThevalueoftheseepagelinecanbederivedfromtheporewaterpressure ,whichisselectedtoactasthemonitoringitem .Consideringlargeareaofthedamandefficientmonitoring ,thefollowingdesignprinciplesforselectingmonitoringspotsaredeter mined .1)Placemonitoringspotsintheformersurvey inglines .2 )Placemonitoringspotsintheareanearthebaseofthedamandslidingarccalculatedbytheanal ysisofthestabilityofthedam .3)Placemonitoringspotsintheareawheretheseepagelineisoverhigh…