地下储气库建设的发展趋势

分析了国外地下储气库建设的三个发展趋势,从5个方面阐述了地下储气库建设技术的发展方向,认为在地下储气库设计中必须采用标准化的工艺设计,以达到减少各设计部门之间的协调、简化工艺方案选择、缩短建库周期和提高建库质量的目的.     

论大型地下商场空调通风及防排烟

本文通过工程实例说明如何将大型地下商场的空调、通风及防排烟系统三者结合在一起，用一套风系统来实现其各自作用的。     

雷竹生长与温度关系的探讨

通过一年的实地观测，初步摸清雷竹生长与温度之间的相关规律。当士表温度8℃时、土层温度在8．5℃以上时，并连续10天为出笋始期。当土表温度和各土层温度达到10℃至15℃时为旺发笋期。当土表温度达到17℃以上和土层温度在16℃以上时为雷竹发笋终末期。     

A Study Transient on Predictive Calculation Method of on Underground Ventilation Network

The authors developed a computer program of transient predictive calculation method on underground ventilation network. The program approximated a field data set of seasonal cyclic changes of air Temperature and humidity at the inlet to the sine curves, and included sensible heat conduction from rock to air current. The temperature of rock around and airway was calculated by finite difference method. The prediction method can be used to calculate the variation of flow rates, temperatures and humidities of air flow in the airways along underground network.     

Experimental Analysis of Vibration Behavior for Large-span Underground Structure

In this paper, a shaking table test for large-span underground structure is introduced. Based on the test, the frequency of inherent vibration, damping ratio and the dynamic response of the structure are studied. The response of the underground structure for vertical seismic excitation is studied as a key point. With the different imbedding depth, the influence of interaction of soil and structure on the earthquake-resistant capacity of the underground structure is discussed.     

ANALYTICAL SOLUTION OF RING SHELL LINING WITH ANNULARLY VERTICAL WALLS MADE CONTACT WITH SURROUNDING ROCK

In this paper,the ring shell lining with annularly verticalwalls made contact with the surrounding rock is considered as a combinationstructure formed of ring shell,inner and outer annular barrels on elastic fo-undation.The complex equation and its solutions of ring shell under deadload of lining and vertical and horizontal surrounding rock pressures are de-rived by the method of complex function.The governing equation and itssolution of the barrels on elastic foundation are also derived by theory ofcylindrical shell.And then,the ring shell lining is assembled by the subst-ructures by means of compatibility conditions of internal forces and defor-mations between them.In the paper,all formulas for the practical computa-tion in engineering are derived,the numerical examples are given and theeffects of the parameters of the lining on the work behaviours of lining alsoare discussed preliminarily     

温室地下蓄热系统换热特性研究

针对现行温室地下埋管式换热系统结构的缺点，为充分利用地下蓄热，提高地温和夜间环境温度，设计了一种新型温室地下蓄热系统。测定了系统蓄热与放热时进出口空气温度、湿度与换热管道出口处空气的流速。试验结果表明，温室地下蓄热系统蓄热和放热时进口空气与出口空气的温度差、焓差较大，其差值随系统运行时间降低，白天蓄热量与夜间释放热量大于系统消耗的电能，蓄热时运行时间不宜大于4.5 h。     

国外地下储气库的技术与发展

利用枯竭油气田、地下含水层、含盐岩层或废矿井来建造地下储气库,是20世纪燃气工业的一项主要技术成就。介绍了国外建造天然气地下储气库的规划要点、数值模拟分析以及利用惰性气体作垫层气的研究,同时介绍了地下储气库的研究进展情况和今后的发展趋势,为我国开展地下储气库研究提供了一些可借鉴的经验。     

地下水位对小麦产量影响的研究

试验于１９９２年１０月至１９９４年６月在江苏农学院作物水分测坑进行，采用人工模拟方法，将地下水埋深分别控制在５０，９０，１３０，１７０ｃｍ，比较不同地下水埋深对小麦生长发育和产量的影响。研究表明：地下水埋深为１３０ｃｍ的小麦产量最高，其次为９０ｃｍ和１７０ｃｍ，５０ｃｍ的产量最低，从产量构成看，产量差异主要表现在每穗粒数和粒重两个方面；花后干物质生产以１３０ｃｍ最高，根系活力也以１３０ｃｍ最强。     

考虑不密实接触地下埋管联合受力分析

埋藏式压力钢管设计中,钢衬、混凝土衬圈和围岩之间普遍存在着不连续的缝隙,致使设计计算时难以进行联合受力分析。针对这种不密实接触问题,采用厚壁圆环组合环法,提出了在钢衬和混凝土之间设置接触层的钢衬、混凝土衬圈和围岩三者联合受力分析方法。并利用变形协调条件,推导出各环变形的解析解,得到钢衬和围岩的压力分担比。不同接触情况下的受力分析结果表明,当接触层弹性模量小于混凝土弹模的1/100时,接触层的弹性模量变化对钢衬和围岩压力分担比的影响较大;而接触层厚度对压力分担比的影响不甚明显。另外,接触层参数可通过其变形与规范建议的初始缝隙相匹配的原则加以确定。