鲍店矿区水源地开采量评价及运行井数最优管理

以业已成并运行的鲍店矿区水源地为倒,利用线性规划首先评价其允许最大开采量。而后,在已建模型基础上,对水源地最优运行井数作了进一步研究,进而实现了水源地运行井数的最优管理。做到了省时、省工、省力。这一思路和方法具有普遍意义。     

基坑开挖对下卧运营地铁隧道影响的数值分析与变形控制研究

以紧邻已运营天津地铁1号线既有隧道箱体上方的西青道下沉隧道基坑工程为背景,结合现场实测数据,采用ABAQUS软件对基坑的实际施工过程进行动态模拟。在此基础上分析既有隧道箱体两侧的土体加固、浇筑底板与抗浮桩形成“保护箍”以及堆载回压等措施对既有箱体轨道的影响及其有效性,指出有针对性地综合采用上述保护措施,能够及时有效地控制既有箱体轨道上抬,保证地铁的安全运营,并进一步研究了不同加固参数对既有箱体轨道变形的影响规律,结果表明：提高各加固参数能减小箱体轨道上抬及变形缝处的箱体间差异变形,但其加固效果却随着参数的增加而减弱,存在着一个合理的参数范围,为施工设计的优化提供依据。     

Back analysis of an operating subsea tunnel considering the degradation of ground and concrete lining

ABSTRACT

An evaluation of the stability of subsea tunnels during operation is very important considering the risks involved with subsea tunnels. Although a large volume of monitoring information can be obtained, back analysis has been performed based on the internal displacement. In this study, the efficiency of an estimation of the safety of an operating subsea tunnel has been improved by implementing the back analysis algorithm based on various monitoring information. The differential evolution algorithm was adopted for back analysis of an operating subsea tunnel. The differential evolution algorithm was improved to accommodate the multiple target variables for back analysis, such as the elastic modulus, cohesion, friction angle of the ground, and the time-dependent elastic modulus of concrete lining. In addition, the elastic modulus of the concrete lining and the properties of reinforced ground can be evaluated with the proposed algorithm using a range of monitoring data, such as the internal displacement and stress acting on the lining. In summary, back analysis with a differential evolution algorithm can be used to evaluate the stability of an operating subsea tunnel.     

Numerical study of air chamber for oscillating water column wave energy convertor

Oscillating Water Column (OWC) wave energy converting system is one of the most widely used facilities all over the world.The air chamber is utilized to convert the wave energy into the pneumatic energy.The numerical wave tank based on the two-phase VOF model is established in the present study to investigate the operating performance of OWC air chamber.The RANS equations,standard k-ε turbulence model and dynamic mesh technology are employed in the numerical model.The effects of incident wave conditions and shape parameters on the wave energy converting efficiency are studied and the capability of the present numerical wave tank on the corresponding engineering application is validated.     

武宿机场新航站楼冬季供热系统设计及技术经济分析

本文介绍了太原武宿机场新航站楼冬季供热采暖和空调双系统的设计及五年来的运行效果。对采暖系统的初投资、空调系统各类设备用电量、每个采暖季的运行费用、投资回收期等进行了分析比较;讨论了在冬季供热中,用采暖系统替代在建筑中使用中央空调系统的优势。     

The exploitation of off-shore mineral resources

The exploitation of offshore mineral wealth is generally higher cost than from land based developments. Given the availability of adequate resources relative to expected demand, interest in the exploitation of most offshore minerals seems likely to remain minimal. There are two exceptions, viz. first, sands and gravels and second, hydrocarbons. Offshore exploitation of the former is restricted to shallow sea floor deposits close to nearby onshore areas of high demand. Their extraction is a highly localised phenomenon. Offshore hydrocarbons production had similar locational characteristics as extensions of pre-existing onshore developments. Recently, however, offshore hydrocarbons have been increasingly exploited in their own right: in areas where market opportunities made such higher-cost operations economically and/or geo-politically attractive. The North Sea stands out in significance. Here, development has been highly pro-active, in terms of political, technological and entrepreneurial considerations. This has produced a unique geographical phenomenon in the maritime environment which will continue to be important for two more decades, and be extended to other north-west European offshore locations. What remains to emerge is the strength of its demonstration effect elsewhere, where the combination of the highly favourable circumstances of Western Europe for such intensive offshore hydrocarbons activities may not reoccur.     

滴淋技术在高海拔地区金矿堆浸中的应用

通过四川甘孜嘎拉金矿堆浸提金方法试验探索研究,经生产实践检验对比,在高海拔地区首次采用滴淋技术取代一般常规喷淋工艺,取得了理想的效果。滴淋工艺与喷淋工艺相比,节约设备及维修费用２５％～３０％,药剂消耗可降至最低、节省用量２０％,浸出周期缩短５～１０天,浸出率提高３％～５％,并有效地改善了环境条件,社会经济效益十分显著。     

无线移频报小型自动填图机的研制

本文介绍自行设计的无线移频报小型自动填图机的设计思想、技术指导和软件硬件设计,并对主要技术问题作了解析。     

Enclosure of the urban commons

This is an essay about the territorial enclosure of urban neighbourhoods. It develops the argument that the shared public realms that became regarded as normal in the cities of the 20th century are inherently unstable. More particularly, they are an unstable form of co-ownership domain (condominium). In many different cultures and economies new forms of local territorial governance are emerging to make joint consumption more sustainable. Most of the essay is devoted to exploring this evolutionary argument and is theoretically oriented and illustrated with historical examples. We end with illustrations of urban enclosure from China, a country that has had to discover almost overnight new forms of organisational, institutional and spatial order.