北京地铁富水隧道施工综合降水技术探讨

北京地铁四号线十八标段区间隧道顶板埋深12 m,处于地下水位之下,施工中若采用地表井点降水将严重影响道路交通,井点降水施工产生的泥浆污染周边环境;同时,受限于地层渗透性小的因素,单一井点降水施工难以实现预期的降水效果,严重影响区间隧道施工安全。结合既有基坑降水技术,采用隧道内辐射井降水、管井降水和井点降水相结合的综合降水技术,解决了施工中占路难和降水施工扰民难题,为地铁施工带来了良好的社会效益。     

盾构施工技术及其应用

综述盾构机械的结构、分类及工作原理，对盾构机的施工速度、施工技术、使用寿命，以及用盾构机挖成隧洞后的衬砌与灌浆问题作了较详细的分析。文末介绍了日本东京地下蓄水池工程和英国环伦敦供水工程采用盾构机械施工的实例     

万家寨引黄工程黄土地层灌浆试验施工技术与成果分析

湿陷性黄土的固结灌浆施工在国内外均无成功的先例，通过本次试验，为隧洞围岩黄土地层灌浆施工探索了一套较为成功的施工工艺和灌浆参数。针对不同材料的可灌性进行了对比研究。     

浅谈浦南高速公路葫芦丘隧道初支掉拱处理

根据在浦南高速公路葫芦丘隧道的施工监理经验,针对洞口段围岩变形,对产生"掉拱"的原因进行分析,简述了处理方案与处理结果,并对隧道土质围岩的施工提出了几点建议,仅供隧道施工技术人员参考.     

模糊评判理论在围岩分级中的应用

基于围岩等级确定的重要性,分析了模糊综合评价的基本原理,探讨了隧道围岩分级的概念及指标,论述了隧道围岩分级的模型及步骤,并通过具体工程实例,验证了模糊评判理论有良好的可操作性.     

锚喷支护在井下复合煤层顶板中的应用

通过对在顶板不坚硬、有动压复合顶板巷道中使用金属树脂锚杆、钢带、喷浆联合支护机理的分析,指出了传统棚式支护被动承压、断面利用率低以及维修量大的缺点,提出了加强爆破控制对支护施工质量的影响因素,探讨了锚杆、钢带、喷浆作用范围。     

Wind turbine performance under icing conditions

The wind energy market is in full growth in Quebec but technical difficulties due to cold climate conditions have occurred for most of the existing projects. Thus, icing simulations were carried out on a 0.2 m NACA 63 415 blade profile in the refrigerated wind tunnel of the Anti‐icing Materials International Laboratory (AMIL). The shapes and masses of the ice deposits were measured, as well as the lift and drag forces of the iced profiles. Scaling was carried out based on the 1.8 MW–Vestas V80 wind turbine technical data, for three different radial positions and two in‐fog icing conditions measured at the Murdochville wind farm in the Gaspé Peninsula. For both icing events, the mass of ice accumulated on the blade profile increased with an increase in the radial position. In wet regime testing (first icing event), glaze formed mostly near the leading edge and on the pressure side. It also accumulated by run‐off on the trailing edge of the outer half of the blade. In dry‐regime testing (second icing event), rime mostly accreted on the leading edge and formed horns. For both icing events, when glaze or rime accreted on the blade profile, lift decreased and drag increased. A load calculation using the blade element theory shows that drag force on the entire blade becomes too large compared to lift, leading to a negative torque and the stop of the wind turbine. Torque reduction is more significant on the outer third of the blade. Setting up a de‐icing system only on the outer part of the blade would enable significant decrease of heating energy costs. Copyright © 2007 John Wiley & Sons, Ltd.     

南水北调中线穿黄隧道盾构注浆浆材试验

为满足南水北调中线工程穿黄隧洞盾构施工工法要求,对研制开发的水泥-膨润土-水玻璃系双液塑性壁后注浆材料,通过室内模拟注浆试验,重点探讨了材料组分对注浆材料流动性、稳定性、凝胶特性、强度等性能的影响.结果表明:凝胶时间可控制在10 s左右;不同配比注浆材料1 h单轴抗压强度为0.08～0.12 MPa,28 d为7.81～8.52 MPa;渗透系数为2.0×10-8 cm/s;模拟注浆时浆液不被水稀释,充填良好;且不会对地层产生劈裂,也不会向开挖掌子面渗漏.     

隧洞中软质岩石收敛变形与量测分析

软弱岩石在地下洞室开挖中会经常遇到，其变形量的大小，直接影响着洞室的稳定与安全。以昌马水库发电洞内收敛变形量测为例，对软弱岩石的收敛变形进行分析探讨。     

方形坑道内爆炸冲击波传播规律

为研究方形坑道内的爆炸冲击波传播规律,开展了1.00,3.25 kg和10.28 kg三种质量的梯恩梯(TNT)药柱坑道内爆炸试验,记录了不同距离处的冲击波压力曲线,得到了冲击波到达时间、超压峰值、冲量等参量。结果表明,坑道内爆炸冲击波的传播分为三个阶段:自由场球面波传播、一维平面波传播和二者之间过渡阶段;除临近爆心处之外,超压峰值满足立方根比例定律,拟合得到了计算偏差不大于10%的超压峰值计算经验公式,冲量不满足立方根比例定律。