河北地区应用地源热泵存在的问题及建议

介绍了我国及河北省部分地区地源热泵系统的发展现状,分析了目前地源热泵系统应用存在的问题,提出了有利于地源热泵系统发展的一些建议。     

深圳鼎和大厦基坑工程基岩裂隙灌浆施工技术研究

以深圳市鼎和大厦基坑工程为例,对基岩裂隙灌浆施工技术进行了深入研究。首先根据该工程的地质条件及水文条件,对施工降水将给场地周边环境带来的影响进行分析,阐述了采取基岩裂隙灌浆止水措施的必要性;然后结合工程实际,提出了适合本工程的裂隙灌浆施工技术,并对主要施工工艺及流程,制浆、灌浆等技术进行了重点研究。论文提出的施工技术和方法可为同类工程施工提供参考。     

Spatial and temporal analysis of urban flood risk assessment

Urban flood risk assessment requires quantification of uncertainty that is spatially and temporally variable. This paper presents a new approach to urban flood risk assessment by: (a) integrating objective and subjective uncertainties and (b) providing full insight into spatial and temporal change of flood risk. A 1-D storm sewer model and a 2-D surface flow model are integrated to describe the dynamic interactions between overland flow on the streets and flow through the storm sewer network. The fuzzy set theory approach is used to assess spatial and temporal variability of urban flood damage, and the acceptable level of partial flood damage. The spatial and temporal variability of fuzzy performance indices: (i) combined reliability-vulnerability; (ii) robustness and (iii) resiliency, are generated as the outcome of the urban flood risk analysis. The methodology is illustrated using the residential community of Cedar Hollow (London, Ontario, Canada) as a case study.     

Assessing the mitigation effect of deep tunnels on urban flooding: a case study in Guangzhou,China

ABSTRACT

There are growing demands of deep tunnels to mitigate the severe urban flooding by providing a large storage capacity for excess storm runoff. This study aims to assess the flooding mitigation effect of a deep tunnel system proposed in the old downtown of Guangzhou, China, and to quantify the flooding volume difference by two storm hyetographs, the Chicago curve and the Improved Huff curve. Results show that the flooding volume is significantly reduced by a minimum of 19% and a maximum of 42% under design storms of 10- and 0.5-year return periods, respectively, when the deep tunnel system is constructed. There is a distinct spatial pattern for the mitigation effect. The best mitigation is in the west and the immediate north of the main tunnel, whereas the east does not show significant mitigation. Moreover, the actual flooding risk is likely underestimated when the Chicago curve is employed to design the storms.     

Application and comparison of two different dual drainage models to assess urban flooding

Two types of dual drainage models were set up to assess urban flooding for a study area in Germany: (1) a static model based on a conventional method in Germany; the overflow volumes of the manholes are gained by the sewer solver HYSTEM-EXTRAN. Using these water volumes and geographic information system (GIS) tools, an overland flow network, composed of flow paths and accumulated water in sinks, is produced, (2) a HYSTEM-EXTRAN 2D model; a two-dimensional (2D) overland flow module is coupled bi-directionally with HYSTEM-EXTRAN. The overland flow and the flow in the sewer system are simulated alternately.

Both models were supplied with a synthetic design rainfall and 25 extreme storms. After comparing the models and the results, a practical approach to assess urban flooding is proposed. In this approach the 2D model will compute the depth, extent, and propagation of floods only in the prone areas specified by the static model.     

深基坑支护设计在工程实践中的具体应用

通过某深基坑支护在实际工程的应用,对深基坑工程现场方案调整、基坑监测等内容作了论述,并提出了基坑支护安全保证措施,最后指出应把深基坑设计当作系统工程来进行,加强监测,配合施工.     

支护形式对基坑近邻建筑物沉降影响分析

应用弹塑性大变形理论及有限差分理论,对地下连续墙加内支撑与地下连续墙加锚杆两种支护形式下基坑开挖引起的近邻建筑物沉降进行了模拟分析,分析表明:内支撑与土层预应力锚杆可有效减小基坑支护结构及近邻建筑物的沉降变形,而内支撑在控制基坑变形方面的作用要远大于土层预应力锚杆。     

降低3~#发电机组除氧系统自耗电技改措施

新疆青松建材化工(集团)股份有限公司本部水泥厂电力车间负责水泥厂新型干法旋窑熟料生产线的纯低温余热发电的生产任务,装机容量为5MW/台,为企业的节能减排做出了贡献,机组在运行过程中发现3#机组自耗电比偏高,为了解决这个问题,技术人员进行了全面分析找出了影响因素,并采取了有效的措施进行了解决。     

基于LMD盒维数与PNN的往复泵声发射故障诊断

针对往复泵泵阀故障诊断,提出使用声发射技术对往复泵泵阀进行故障信号采集。利用局部均值分解(LMD)对非线性声发射信号处理和分形盒维数对非线性信号定量描述的特点,首先对故障信号进行LMD处理,得到含有故障特征的PF分量,然后算出各PF分量的盒维数,通过比较分析盒维数进行故障诊断,最后将各PF分量的盒维数作为特征向量输入概率神经网络(PNN)进行模式识别。通过实验分析,证明该方法对往复泵泵阀故障诊断是有效可行的。     

稠油油藏蒸汽吞吐转汽驱开发方式研究

稠油油藏为提高采收率,蒸汽吞吐后需要进行转驱开采,以增加原油流动,提高油田的经济效益。以K油田为例,通过数值模拟方法对K油田注入介质,转驱时机,转驱注入方式及井距等因素进行对比研究,以期能够提高K油田采收率和为其增加更大的经济效益。经研究发现,K油田最优的蒸汽吞吐转汽驱的开发方式为反九点法布井、以湿蒸汽为介质的注一停一间歇汽驱的生产方式。