發(fā)布時(shí)間：2018-05-21 01:04

  本文選題：引水隧洞 + 有限元��； 參考：《甘肅農(nóng)業(yè)大學(xué)學(xué)報(bào)》2017年05期

【摘要】：【目的】探求飽水疏松粉砂巖在雙排水平凍結(jié)法施工條件下的溫度場(chǎng)分布情況,為今后隧洞凍結(jié)法施工最優(yōu)方案的制定提供參考.【方法】以甘肅省引洮一期工程總干渠7#隧洞出口冷凍施工為例,基于熱分析相變理論,采用有限元軟件ANSYS,研究了引水隧洞雙排水平凍結(jié)施工積極凍結(jié)期間的溫度場(chǎng)分布、凍結(jié)管交圈時(shí)間及維護(hù)凍結(jié)期間凍結(jié)帷幕厚度的發(fā)展?fàn)顩r,并探討了此方法的數(shù)值模擬精度.【結(jié)果】相鄰兩凍結(jié)管交圈時(shí)間30d,積極凍結(jié)50d后,凍結(jié)帷幕厚度已達(dá)到設(shè)計(jì)值2.5m;在考慮施工安全的情況下進(jìn)行了60d的維護(hù)凍結(jié)期,期間溫度保持在-24℃左右,且限制了凍結(jié)帷幕的進(jìn)一步發(fā)展,避免了開(kāi)挖過(guò)程中由于凍土強(qiáng)度過(guò)高而使施工難度增大.【結(jié)論】通過(guò)模型模擬和實(shí)測(cè)數(shù)據(jù)的比較分析,證明該模型應(yīng)用具可靠性,可為同類工程施工的方案制定提供理論依據(jù).
[Abstract]:[objective] to study the temperature field distribution of saturated loose siltstone under the condition of double row horizontal freezing method. This paper provides a reference for the formulation of the optimal construction scheme of tunnel freezing method in the future. [methods] taking the freezing construction of tunnel exit of the main canal of the first phase diversion project in Gansu Province as an example, based on the phase transition theory of thermal analysis, By using the finite element software ANSYS, the temperature field distribution during the active freezing period of the double row horizontal freezing construction of the diversion tunnel, the freezing pipe intersecting time and the development of the freezing curtain thickness during the maintenance and freezing period are studied. The numerical simulation accuracy of this method is also discussed. [results] the freezing curtain thickness has reached the design value of 2.5 m after 50 days of active freezing, and the freezing period of 60 days has been carried out under the condition of considering the safety of construction. During the period, the temperature is kept around -24 鈩，

本文編號(hào)：1917028