Investigation report of geotechnical disaster on river area due to typhoon landfall three times on Okhotsk region,Hokkaido, Japan

For one week from August 17 to 23, 2016, three consecutive typhoons made landfall in Hokkaido for the first time on record. These typhoons and the front they stimulated brought record-breaking torrential rain over the eastern part of Hokkaido. To investigate the damage to grounds and rivers resulting from this rainfall, the Japan Society of Civil Engineers (JSCE) and the Japanese Geotechnical Society (JGS) formed a disaster research group to conduct an investigation. This report provides the results of the investigation into damage to the grounds of areas along the Tokoro River of the Okhotsk region, Hokkaido, that suffered from this tremendous and diverse disaster. Specifically, the report describes the situation of the levees which were broken and eroded by the overflowing water, the shape of the levee bodies, the levee body soil properties examined by observation of the sections, as well as the occurrence of sand boiling and air blows. The washout of road embankments as well as damage to road bridge mounting fills and abutment backfills were also investigated. The investigation has demonstrated the need to clarify the resistance of the abutment backfills and levee bodies to flowing water as well as the geotechnical predominant factors in order to clarify the mechanisms behind erosion and washout, the need to review new measures that allow for the scale of sand boiling and resultant changes in levee body stability, and the fact that the existing embankments were able to temporarily suppress the flooding water which had spilled over from the river. Furthermore, although it has been identified that the findings of a study on an embankment washout associated with a tsunami can be applied to measures taken against the overflowing water, it has also been found necessary to clarify the predominant geotechnical factors using model tests and to use a more sophisticated analytical approach to establish a geotechnical stability review as soon as possible in order to prevent the levees and embankments from being eroded and washed out due to overflowing water.     

HZB253-640型电动锅炉给水泵前置泵自由端轴承频繁磨损原因分析及处理

针对山西兴能发电有限责任公司二期2×600 MW扩建工程,3#机组1#给水泵前置泵自由端轴承频繁磨损的故障情况,从润滑油品质、设备自身缺陷、轴系中心配合、转子的轴向窜动、轴承的工作游隙等多方面进行了认真的分析,并且在其间进行了多次改进及调整,最终解决了该技术难题.在提高了自身解决问题的能力的同时,确保了机组的稳定运行,...     

新疆翻浆路基土吸水抗剪强度衰减非线性分析

从土体的实际内部构造出发,通过理论研究及试验验证,得出了土体在非饱和范围内吸水抗剪强度衰减非线性过程的一些有益的结论,丰富了非饱和土土力学的科学内涵,目前可通过含水量和强度参数的足够精度的曲线拟合来推算土体在不同含水量下的抗剪强度参数,试验结果表明这些推算参数和实际比较吻合,能够满足工程需要。     

棉织物的生物酶前处理

分析了影响棉织物润湿性的因素，证明利用酶的协同效应，选用纤维素酶和果胶酶通过预处理或添加表面活性剂的方法可显著改善棉纤维的润湿性，但生物酶精练与碱煮练对棉织物润湿性改善仍有一定差异。     

蒸谷米生产工艺简析

介绍了中粮(江西)米业有限公司的蒸谷米生产工艺。     

樱桃番茄果脯糖煮液的澄清与脱色研究

对樱桃番茄果脯生产中废糖液的澄清与脱色方法进行了研究,采用明胶澄清、活性炭脱色处理,并考察了温度、时间、糖浓度等因素对脱色效果的影响。结果表明:采用1%的明胶混合均匀后在室温8～12℃下静置5～10h,澄清效果好。活性炭对樱桃番茄果脯糖煮液的脱色效果明显,在pH4、搅拌速度120r/min的条件下、80℃、30min、糖液浓度为50%时脱色效果最好。     

水平管外沸腾强化换热的数值模拟与场协同分析

应用FLUENT软件对制冷剂R134a在光管和横纹槽管水平管外沸腾传热进行三维数值模拟,得到其饱和泡状沸腾过程中体积含气率的分布规律,并比较它们的换热系数。结果表明横纹槽管外侧能够很好地强化沸腾传热。此外,还通过改变边界条件分析质量流量、热流密度的变化对横纹槽管管外沸腾换热系数的影响。最后应用场协同理论,从局部换热角度分析其强化机制。研究表明,横纹槽管水平管外沸腾换热得到强化的原因是其凹槽前后的速度场与温度梯度场之间夹角较小,协同程度更好。     

燃气-蒸汽联合循环无旁通烟囱余热锅炉煮炉方案选择

论述了无旁通烟囱余热锅炉的启动特点,介绍了过热器应力腐蚀现象,指出对于无旁通烟囱余热锅炉不可采用常规的方式煮炉,给出了切实可行的煮炉方案。图３参８     

寒冷地区污水处理工程钢筋混凝土结构耐久性研究

污水处理工程在运行中其钢筋混凝土结构经常受到环境介质的蚀破坏,尤其在北方寒冷地区,年要经受几十次冻融交替作用,严重影响其使用功能和结构安全,本文从理论上分析了钢筋混凝土结构在几种条件下的侵蚀机理及耐久性能,阐述了提高钢筋混凝土结构耐久性应从设计,施工到污水处理过程进行综合防治的思想。     

LNG槽车装车过程BOG产生的动态模拟与分析

应用HYSYS Dynamic流程模拟软件,建立了LNG槽车装车的动态模型,实时模拟两种装车方式所产生BOG的压力、温度、流量、槽车压力等参数随时间的变化。模拟结果分析得出:装车结束时,带压装车方式具有槽车储罐压力高,装车累积流量、BOG产生量少,运行费用低,卸车时间短等特点,具有较强的可行性和经济性。