本文選題：軟巖硐室 + 支護時間��； 參考：《水電能源科學(xué)》2017年08期

【摘要】：為揭示某軟巖硐室的合理支護時間,結(jié)合調(diào)壓井硐室的結(jié)構(gòu)特征,建立三維有限元模型,基于冪律流變模型,研究了無支護(方案1)、及時支護(方案2)、滯后15d支護(方案3)、滯后30d支護(方案4)四種方案下施工期及完建150d內(nèi)襯砌的位移、應(yīng)力和圍巖塑性區(qū)開展范圍。結(jié)果表明,方案3襯砌的應(yīng)力水平和位移較其他2種支護方案小,最大壓應(yīng)力約為方案2的64%、方案4的70%;最大位移約為方案2的2倍、方案4的1.5倍;支護越及時,圍巖的塑性區(qū)開展范圍就越小,但方案3圍巖最大塑性區(qū)范圍為8.5m,與方案2的圍巖塑性區(qū)相差較小,且塑性區(qū)發(fā)育深度小于圍巖錨固深度,從充分發(fā)揮圍壓自承能力和支護結(jié)構(gòu)的安全性角度綜合分析,建議采用方案3。研究結(jié)果為此類工程設(shè)計提供借鑒。
[Abstract]:In order to reveal the reasonable supporting time of a soft rock chamber, a three-dimensional finite element model is established based on the power law rheological model, combined with the structural characteristics of the chamber in a pressure regulating well. This paper studies the displacement, stress and the development range of surrounding rock plastic zone during construction period and 150 days after construction under the four schemes of no support (scheme 1), timely support (scheme 2), delayed support (scheme 3), delayed support (3 d) and delayed 30 d support (scheme 4). The results show that the stress level and displacement of the lining in scheme 3 are smaller than those of the other two support schemes, and the maximum compressive stress is about 64 of scheme 2 and 705 of scheme 4; the maximum displacement is about 2 times of scheme 2 and 1.5 times of that of scheme 4; the more timely the support is, The range of plastic zone of surrounding rock is smaller, but the range of maximum plastic zone of project 3 is 8.5 m, which is smaller than that of scheme 2, and the development depth of plastic zone is smaller than that of surrounding rock Anchorage. From the angle of giving full play to the self bearing capacity of confining pressure and the safety of supporting structure, it is suggested to adopt the scheme 3. The research results provide reference for this kind of engineering design.
【作者單位】： 四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護國家重點實驗室;四川大學(xué)水利水電學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)(2015CB057903) 國家自然科學(xué)基金項目(51079092)
【分類號】：TV223
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本文編號：1910141