住宅工程外墙渗漏的原因及防治

1．框架结构住宅工程中的填充墙，基本上为非承重的灰砂砖或小型砌块，运输与施工过程中容易破损，缺棱掉角，若在施工中使用或由于设备管安装的需要对己砌外墙进行凿打，人为地造成砌体破损，形成渗水处。     

从单颗粒模型到还原炉炉况的计算机放大研究

将从实验中得到的单颗粒团矿动力学模型动用到直接还原炉中，针对不同加碳比例，不同还原温度、不同还原气供给量进行了模拟计算，得到了一些可资参考的结果。     

Stress variation of soil surrounding tunnel and grouting reinforcement effect based on stress release

With FLAC, a criteria of stress release ratio （SRR）, i.e., about 10% of the relative difference of the ground settlement before and after the supporting system is installed, is incorporated into stress release method （SRM）. At the same time, the Mohr-Coulomb Criterion is used to analyze stress changes around the tunnel induced by excavation. It shows that the surrounding soil around shallow tunnels can be partitioned by loosened zones （unloading zones） and plastic zones among which the shear stresses in the soil are less than 10 kPa below the M-C yield line. Both types of zones are separated. With the increasing of the SRR, the areas of plastic zones and loosen zones gradually increase. The surrounding soil is equally divided into 24 regions in order to study the influence of different grouting regions on the ground settlement. The reinforcing effect of grouting can be modeled by enhancement of the soil strength around the tunnel. By the approach of the SRM, numerical analysis indicates that, in the upper area （top of the surrounding soil about 210°）, the reinforcing effect gradually decreases as the reinforcing region moves from arch springing to the vault of the crown; when reinforcing regions lie in the upside of the surrounding soil, the influence on the ground settlement is generally greater than in the lower part; at the same time, with the increase of the SRR, the influential differences are more and more obvious.     

便携式干式变压器导线材料原位无损检测装置的研制

研制出一款便携式干式变压器导线材料的原位无损检测装置。介绍了该装置的整体结构和主要电路。对装置的检测能力进行测试,结果表明,该装置可在不破坏干式变压器的条件下,对导线材料实现无损鉴别。     

交通荷载作用后粉质黏土不排水强度特性试验研究

利用动三轴仪,对京津高速铁路沿线典型的饱和粉质黏土经历交通荷载长期作用前后的强度进行对比试验,研究排水条件、施工扰动及超固结等因素对土体振后不排水强度的影响.研究结果表明:长期交通荷载作用下产生的累积轴向应变和孔压均可作为试样结构破坏程度的表征,且存在临界值.当应变或孔压超过其临界值时,振后强度会发生衰减.若施工扰动破坏了土体天然结构性,两者的临界值均将大大降低,地基振后强度均发生衰减,且衰减程度也比天然地基大.地基中存在良好的排水途径将有效提高正常固结地基振后承载能力;交通荷载的往复作用及排水条件对预压处理后的超固结地基强度影响较小.     

地基不均匀沉降时埋地管涵纵向力学模型探讨

地基不均匀沉降是影响埋地管涵纵向力学性状的主要因素之一。针对Winkler地基模型的缺陷,采用Pasternak双参数地基模型建立了较为合理的考虑地基差异沉降的埋地管涵纵向力学模型,得到了沉陷区埋地管涵的挠曲线表达式,进而对埋地管涵的纵向力学性状要素进行分析,表明管涵结构的挠度、转角、弯矩、剪力均在差异沉降处有突变,且各要素受不均匀沉降的影响范围有限。     

进一步加强PVC塑钢门窗施工安装质量的控制

塑料门窗经过型材及其配件的采购,门窗的组合、装配、门窗的施工安装这三个过程中,塑料门窗的施工安装是最后一个非常重要的环节。本文通过塑钢门窗的特性、施工安装特点等的论述,指出了PVC塑钢窗工艺程序及工艺要点的控制,最后指出了PVC塑钢窗常见质量通病及防治措施。