结构阻尼识别中的目标函数问题

本文以三对共六个小型单层钢框架的弹性动力试验和弹塑性动力－静力对比伙依据，分别以结构的绝对最大位移反应ＭＤ，位移平方和反应ＳＳＤ总滞回耗能ＥＨ作为等效目标，对结构阻尼识别中的目标函数选取问题进行了讨论。     

山西口泉断裂与大同侏罗纪煤田的关系

山西口泉断裂是一条规模大，活动期长的大断裂，它构成了云岗断坳与桑干河新裂陷的构造单元界限，同时又是大同侏罗纪煤田的东部边界，一般认为，这一大型基底断裂的形成和演化对煤田地质构造的发育具有重要的控制作用。本文对这一构造的形成机制和演化历史进行了分析研究，阐述了口泉断裂的青磁窑断层对大同侏罗纪煤田地质构造的展布规律和构造特征的控制关系。     

An historical review of landslide research in the South Wales coalfield

Summary The areal density of landslides in the coalfield of South Wales is one of the highest in the UK. During the past 100 years landsliding has had considerable impact, causing structural damage and loss of life. Most of the landslides were initiated under periglacial conditions but many became reactivated due to the activities of humans, particularly during the late 19 th century when widespread urban and industrial development commenced in the Welsh valleys. A number of the area's larger landslides are first-time slides which occurred during the past 100 years. This paper sets out to chart the history of landslide research in the coalfield, which began through work by mining engineers.     

原煤尾气和煤渣中多环芳烃相关性测定

对原煤、尾气和煤渣中多环芳烃进行了相关性测试。在模拟工业锅炉代表性燃烧条件下将烟煤和无烟煤样品在管式炉中燃烧，分别采用ＧＣＭＳ和ＨＰＬＣ法对原煤、尾气和煤渣中的多环芳烃种类和含量进行了定性和定量测定。通过在特定条件下某一煤种中多环芳烃种类、含量在燃前、燃后变化的相关性，探索煤中多环芳烃在燃烧过程中的衍变规律     

淮北闸河矿区二叠系含煤地层沉积环境分析

运用岩矿鉴定、光谱分析、Ｘ衍射、沉积磷酸盐分析等先进的实验手段，对淮北闸河矿区二叠系含煤地层的沉积特征进行了详细的研究。在沉积特征研究的基础上，确定本区二叠纪时为以河流作用为主的建设性河控浅水三角洲沉积环境。     

A comparison of rock mass disturbance in TBM and drill and blast drivages at the Donkin Mine,Nova Scotia

Summary The initial phase of the Donkin-Morien project involves the driving of two parallel tunnels through an interbedded sequence of coal measures strata to intersect the Harbour Seam which lies approximately 3.5 km offshore. The No. 2 tunnel was driven a total distance of 3579 m using a 7.6 m diameter full face shielded Lovat TBM and supported by steel ring beams. The No. 3 tunnel was initially driven a distance of 1027 m using conventional drill and blast methods (7.6 m wide by 5.3 m high with a uniradial arch and supported by rock bolts and shotcrete). The TBM was subsequently used to complete the drivage of the No. 3 tunnel to the Harbour Seam.Both the No. 2 and No. 3 tunnels followed a thick sandstone unit at a grade of –20% for the first 900 m. This provided an opportunity to compare the rock mass disturbance resulting from two different excavation methods. A programme of field and laboratory measurements was therefore undertaken, which included: the use of a borehole dilatometer to determinein situ rock modulus,in situ gas permeability testing, seismic reflection surveys on the tunnel walls, and the laboratory testing of core samples.The paper examines the four different techniques used and compares the results obtained.     

中国东北部晚中生代断陷盆地模式在松辽深部煤成气预测中的可能应用

经地震探测和地质分析,松辽深部晚中生代断陷盆地与其周围地区J_3—K_1的断陷盆地在地质结构和成盆期均具有相似性,同属东北亚晚中生代断陷盆地系。作者认为,应用其周围同类型断陷盆地模式对松辽深部煤成气远景的预测和生油潜力的判断具有重要价值,同样也适用于深埋于下辽河第三纪坳陷之下的晚中生代盆地成气远景的预测。     

Influence of width/height ratio on post-failure behaviour of coal

Conclusions The post-failure slope immediately after strength failure decreases on the negative side with the increase inw/h ratio. Atw/h equal to around 10 or 11 this slope becomes almost zero and then again the slope increases but on the positive side with further increase inw/h ratio.At loww/h ratios, the post-failure characteristic touches the abscissa ultimately. Forw/h greater than 4 or 6 after an initial fall, the broken mass starts reconsolidation on further loading due to high lateral constraints provided at the centre and the curve starts rising again. Forw/h ratios greater than 10 or 11, there is no loss in the post-failure strength.     

Molecular fossils from chemical degradation of macromolecular organic matter

Hydrogenolysis with rhodium-on-charcoal was found to be an effective method for degrading different types of macromolecular material of geological origin. Between 6 and 70% of coals, kerogens and humic substances were transferred into low-molecular-weight soluble materials. The reaction products contained a series of monomeric and dimeric lignin-derived compounds which strongly suggest intact fossil lignin as their source. The substitutional patterns of the released phenols reflect the type and amount of terrestrial organic matter input and diagenetic alterations.In addition to the lignin constituents, a complete suite of hydrocarbons differing from those of the low-molecular-weight fraction was obtained after hydrogenolysis of the sample material. Hydrocarbons released by the hydrogenolytic degradation technique were attached to the polymeric matrix as monoor polyethers. Deuterium was used in the degradation experiment to evaluate the sites of chemical bonds by which 4-methylsteranes and hopanes are attached to the kerogen matrix. These experiments suggested a linkage of the released molecules with ring A and the side-chain, respectively.     

The petrography,structure and mechanical behaviour of coals

Summary The objective of this study is to determine the parameters which influence coal's mechanical behaviour. The two coals examined (HBL, Simon, France and Barro Banco, Brazil) structurally originated from different deposits. The differences are readily explained by the contrasting composition of vitrain, clarain, durain and fusain. Their mechanical behaviour is linked to their petrographical composition. The Lorrainain coal behavioural pattern was evaluated. It is elastobrittle or elastoplastic with progressive failure. Brazilian coal behaves according to a pattern of elastoplastic with progressive failure or perfect elastoplastic.