填土路堤下复合地基中桩体的非线性有限元分析

将平面问题有限元法用于填土路堤下复合地基性状的研究,编制适用于复合地基的二维有限元分析程序,程序中可以引入线弹性、Duncan Chang非线性弹性两种本构模型,并在桩与土以及堆体与地基之间设置接触面单元以模拟可能发生的滑移。此外,利用程序分析了复合地基中桩体采用线弹性和非线弹性时,对地基沉降、水平位移及桩土应力比的影响,从而为填土路堤下复合地基的设计提供参考依据。     

南方地区膨胀土性质对比试验

通过对湖南省邵永路、衡南路、常张路、广西宁明盆地膨胀土的对比试验，分析了不同地区膨胀土的特性及其产生的原因。     

STUDY ON MAXIMUM SPECIFIC SLUDGE ACIVITY OF DIFFERENT ANAEROBIC GRANULAR SLUDGE BY BATCH TESTS

The maximum specific sludge activity of granular sludge from large-scale UASB, IC and Biobed anaerobic reactors were investigated by batch tests. The limitation factors related to maximum specific sludge activity (diffusion, substrate sort, substrate concentration and granular size) were studied. The general principle and procedure for the precise measurement of maximum specific sludge activity were suggested. The potential capacity of loading rate of the IC and Biobed anaerobic reactors were analyzed and compared by use of the batch tests results.     

分体式铰链门挂入率公差分析研究

文章针对采用分体式门铰链的车型在项目起步阶段出现门挂入率低的问题,利用PDCA循环进行质量提升,运用公差分析软件3DCS对门的装配公差进行分析研究。从夹具公差、零件公差等方面给出优化方向,确认夹具对铰链轴旋转的控制为主要影响因素,并通过同轴度计算公式对结果进行深入分析,提出同轴度需要控制在0. 1 mm内,铰链旋转量需要控制在0. 2 mm以内,并以此为依据制作检具和制定超差预警机制,实车验证有效。     

填土路堤下复合地基受力与变形的CAT分析

本文利用编制的二维有限元程序，分析了复合地基中的桩土刚度比、置换率、桩长以及路堤刚度等对地基沉降、侧移及桩土应力分配的影响，特别是路堤刚度变化对应力比的影响，并模拟了填土路堤下复合地基的受力性状，从而为填土路堤下复合地基的设计提供了参考依据。     

广佛路扩建工程水泥土复合地基承压性能评价

软土地区用深层搅拌桩处理地基时，桩的承载力往往不是由桩土间摩阻力和桩端承载力所控制，而是由桩体本身强度所控制。因此，桩身强度与承载力的匹配是保证加固质量的关键。通过实际工程的检测结果，评价水泥土复合地基的承载性能。     

Isolation and Characterization of Microorganisms for Degradation of Minimal Oils and Fats at Low Temperatures

The isolation of microorganisms for biodegradation of minimal fats and oils at low temperatures was reported. By using rapeseed oil as a sole carbon source, six strains were isolated from five kinds of oils/fats-contaminated wastewater, soil, and active sludge. Among them, two strains which show the highest oil removal ratios were identified as Pseudomonas pseudoalcaligenes and Pseudornonas mendocina, respectively. The experiments of orthogonal impact conditions show that the optimal oil degradation condition is at pH 8.0, 5 C and 100 mg/L oil. Under this condition, the rapeseed oil degradation ratios of two strains after 24 hours amount to 92. 6% and 92.0% respectively, whereas the removal ratios of lard decrease to 39.5% and 54.3%.     

浅谈电子文件的保管与保护

随着办公自动化的普及和电子商务、电子政务的发展．电子文件的数量在不断增长。将电子文件保管好以提供利用是档案管理者的使命，也是电子文件管理的目的所在。     

预应力混凝土路面应力分析新思路

文中提出用有限元一无界元的方法计算预应力混凝土路面的应力和变形。针对预应力混凝土路面结构的特点，采用板底摩阻力的迭代处理模型和多向影射无界元，计算结果表明分析模型是正确的。采用的计算方法具有结点数目少、精度高、便于网格自动形成等特点。