微型花管桩在覆盖层治理中的应用

采用微型花管桩对土体灌浆形成的帷幕墙对隧道地基进行加固。该方法由注浆花管和注浆固结后的土体形成复合基础共同承担隧道墙脚传来的荷载,改变隧道地基地层承载力较低的性能,提高隧道墙脚底部及仰拱与微型桩及帷幕墙共同承载和变形协调的能力,为今后类似工程提供了经验。     

引黄工程总干线7#、8#隧洞内防渗处理工程的施工

文中论述了引黄工程总干线7^#、8^#隧洞防渗处理工程的施工方案、采用材料及施工工艺。     

深埋隧洞开挖稳定性评价方法对比研究

引入2种等效超载法,并结合强度折减法和超变形法,对深埋隧洞初次开挖支护的稳定性进行渗流-应力耦合计算分析.结果表明,考虑增加初始孔隙水压力和应用弹塑性损伤本构模型均会增加破坏区的范围和最大值;等效超载法与强度折减法产生的破坏区范围差异性较大,且得到的安全系数要大于强度折减法;基于弹塑性损伤模型的强度折减法得到的安全系数...     

北京贤良汇会所夜景照明设计

本文从贤良汇会所周边环境和建筑群落特点入手,详细介绍了其夜景照明设计的设计思路、照明效果及设计中的一些突破点.     

加油站电气设计

针对汽车加油站存在爆炸危险区域这一特殊性,详细介绍汽车加油站爆炸危险区域的划分,提出了固定式可燃气体报警器、液位控制显示器、加油机的电气示意图,详细地阐述了加油站的照明设计及防雷、接地系统设计,具有一定的参考价值。     

隧道塌方事故处理的研究与实践

通过对隧道坍塌的机理进行分析,及时采用了强支护,对隧道不同坍塌部位分别采取管棚法、小导管注浆法及二次衬砌加强及回填法等进行了处理,取得了理想的处理效果。     

Tunnelling through weak and fragile rocks of Himalayas

A considerable amount of tunnelling has been going on in India for various projects such as hydroelectric power, irrigation, roads and railways. Most of these projects are located in Himalayas, far awa...     

Study on the new shell bolting and shotcrete support and its application in soft rock tunnels

A new kind of tunnel support was put forward on the basis of the anchor spray support principle. The mechanics of the new three-dimensional steel bar shotcrete lining support was studied and the structure’s internal forces were analyzed. The model experiment was done relying on the industrial test. The conclusion of numerical calculations proved that the ANSYS program is reasonable and creditable. It was compared to other kinds of support that are commonly used in soft rock tunnels. The technique and economic contrasts of the typical tunnel with support three-dimensional steel bar were completed.     

三台阶七步法在软岩隧道应用技术探讨

探讨了三台阶七步法在软岩隧道中的应用，对超前地质预报、加强支护、步距控制、监控量测等关键技术进行了分析，并与双侧壁导坑开挖法、CRD法等进行了比较，总结归纳了该法的优点，以期更加完善的推广应用该工法。     

Robust model of a transient wind tunnel for off-design aerothermal testing of turbomachinery

Short duration wind tunnels offer an economical approach to study the aero-thermal operation of propulsion components, while reproducing temperature ratios, Reynolds and Mach numbers of the actual engine conditions. The present paper aims at modeling with high fidelity the von Karman Institute compression tube facility. This wind tunnel was simulated using the EcosimPro suite to characterize the behavior of each subcomponent during the whole test envelope, including the turbine map at off-design. The numerical predictions were then assessed through the comparison with experimental data. The model was proven to be an effective tool to accurately evaluate all the operating regimes that a research turbine experienced during the experimental sequence. Consequently, the present model allows exploiting the complete test run duration to obtain unique experimental data from the turbomachinery operating at far off-design conditions. The capability to experimentally test components at off-design is fundamental to understand the flow physics of any gas turbine engine operating at extreme conditions and to characterize the transient performances of fluid-machinery in high-speed propulsion concepts. However, technical dissemination on these aspects is scarce.