本文關(guān)鍵詞： 隧道工程 循環(huán)進(jìn)尺 極限平衡法 破壞模式 上限法 非穩(wěn)定狀態(tài)　出處：《中國公路學(xué)報》2016年04期 　論文類型：期刊論文

【摘要】：為了研究隧道開挖過程中循環(huán)進(jìn)尺的合理性和安全性,提出了隧道掌子面與循環(huán)進(jìn)尺相結(jié)合的2種破壞模式,即循環(huán)進(jìn)尺段的局部坍塌、掌子面與循環(huán)進(jìn)尺段的整體坍塌,分別采用極限平衡法與上限法推導(dǎo)了循環(huán)進(jìn)尺計算公式。通過綜合考慮2種破壞模式下的循環(huán)進(jìn)尺產(chǎn)生條件,建立了非均衡支護(hù)壓力、黏聚力、內(nèi)摩擦角等指標(biāo)之間的相互關(guān)系。研究結(jié)果表明:循環(huán)進(jìn)尺與掌子面的穩(wěn)定存在關(guān)聯(lián),且掌子面的穩(wěn)定是主控條件,在施工中需重點(diǎn)關(guān)注掌子面正前方土體加強(qiáng);同時,當(dāng)掌子面與循環(huán)進(jìn)尺處于局部坍塌狀態(tài),則循環(huán)進(jìn)尺主要受黏聚力控制,施工中可采用最大循環(huán)進(jìn)尺,如處于整體坍塌,則循環(huán)進(jìn)尺易受各指標(biāo)影響;實(shí)際設(shè)計施工中可采用提出的圖表優(yōu)化得到最佳循環(huán)進(jìn)尺。
[Abstract]:In order to study the rationality and safety of circular ruler during tunnel excavation, two failure modes, namely local collapse of circular ruler section, are proposed. The whole collapse of the palmtop surface and the circular ruler section is obtained by using the limit equilibrium method and the upper limit method respectively. The conditions of the cycle ruler generation under two kinds of failure modes are considered synthetically by the method of limit equilibrium and the upper limit method. The relationships among the indexes of unbalanced support pressure, cohesion, internal friction angle and so on are established. The results show that there is a correlation between the stability of the circular ruler and the face of the palm, and the stability of the surface of the palm is the main control condition. In the construction, we should pay more attention to the strengthening of soil in front of the palm; At the same time, when the face of the palm and the circular ruler are in the state of local collapse, the circular ruler is mainly controlled by cohesion force, and the maximum circular ruler can be used in construction. If it is in the whole collapse, the circular ruler is easily affected by each index. In actual design and construction, the proposed chart can be used to optimize the optimal cycle ruler.
【作者單位】： 中南大學(xué)土木工程學(xué)院;合肥工業(yè)大學(xué)交通運(yùn)輸工程學(xué)院;約瑟夫·傅里葉大學(xué)3SR實(shí)驗室;
【基金】：funded by the National Basic Research Program of China(“973” Program)(No. 2013CB36004) National Natural Science Foundation of China(No.51378510 &51308072)
【分類號】：U455.4
【正文快照】： stability　and　round　length　is　disregarded[8-9].0 IntroductionThe　limit　analysis　theorem　is　a　useful　tool　toThe　determination　of　round　length,the　lengthsolve　the　stability　problem　of　geotechnical　struc-of　unsupported　span　behind

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