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近期,市政老旧桥梁建设过程中,可能会采用加宽的方式,但是加宽后的宽桩基础容易出现与原有宽桩基础沉降量不同的问题,会严重影响市政桥梁桩基础加宽之后的安全性.为此,本文结合某工程建设的实际情况,分析市政旧桥不同参数对桩基沉降的影响,分别研究1.3米桩径和1.5米桩径下各项参数的变化,并分析工程施工中桩基沉降施工技术的应用措... 相似文献
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注浆是隧道围岩加固与涌水封堵的主要技术手段,当围岩较为破碎且自稳能力较差时,注浆过程中若采取了不合适的注浆压力,极易造成围岩大变形甚至塌方等次生灾害。基于渗流-应力耦合理论,选取典型隧道开挖断面,建立注浆作用下渗流场与应力场数学模型,运用COMSOL多物理场耦合软件分析注浆过程中注浆压力作用下隧道围岩的变形规律。结果表明,围岩等级为Ⅴ时,注浆过程中注浆压力不断向隧道周围地层中扩散与传递,渗流场、应力场分布随注浆孔深度增加呈现衰减趋势; 随着注浆压力的提高,应力发生急剧变化,并不断地向围岩深部转移; 注浆初期,围岩变形速率急剧上升,注浆后期围岩变形速率下降,且变形量趋于稳定。依托具体工程实例,提出了合理选择注浆压力的控制技术,保证了围岩的稳定和安全。 相似文献
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The multi-principal high-entropy alloys (HEAs) are promising new alloys. However, it is a challenge to screen out the suitable composition from the diverse combinations. Referring to the prototype AuCu3 with AB3-L12 structure, where it becomes a face-centered cubic (fcc) structure if element A and B are the same element, the site occupying tendencies of the elements and thermodynamic functions are predicted by using the sublattice model supported with first-principles total energy calculations. By considering the Gibbs energy of formation and the configurational entropy, the fcc HEAs in available literatures are examined, and the results of the quinary system with equal-atomic composition CoFeMnNiM and the hexbasic system with equal-atomic composition CoFeMnNiSmM are reported, respectively, where the element M is selected from the rest of the periodical table. When M=Cr, Zn, Ru, Rh, Pd, Re, Os, Ir, or Pt in the quinary systems CoFeMnNiM and when M=Ru, Pd, or Pt in the hexbasic systems CoFeMnNiSmM, respectively, the alloys are recommended to be potential fcc HEAs. The new approach opens a new way to mine the rich ores of HEAs. 相似文献
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