【摘要】：盾構(gòu)法已廣泛應(yīng)用于地鐵隧道中，已建成的地鐵隧道可能因各種原因?qū)е鹿芷宇^張開，進(jìn)而引發(fā)邊緣混凝土壓碎、鋼螺栓受拉屈服、漏水等嚴(yán)重問題。為此，本文提出了一種盾構(gòu)隧道管片接頭的短期加固方法，即當(dāng)接頭張開量過大時(shí)，將預(yù)處理過的形狀記憶合金（Shape MemoryAlloy，簡(jiǎn)稱SMA）螺栓裝入相鄰管片的預(yù)留孔中并加熱，利用SMA的形狀記憶效應(yīng)為管片接頭提供一定的閉合回復(fù)力，促使接頭張開量減小從而為后續(xù)長(zhǎng)期加固創(chuàng)造有利條件。本文對(duì)所提短期加固方法進(jìn)行了初步研究，主要工作包括以下四個(gè)方面： （1）開展了SMA棒的回復(fù)力試驗(yàn)，為隨后加固試驗(yàn)方案的確定提供了重要基礎(chǔ)數(shù)據(jù)。研究表明：預(yù)拉應(yīng)變5.80%時(shí)，本文所用SMA棒的控制回復(fù)應(yīng)力的峰值可達(dá)380MPa左右，該回復(fù)應(yīng)力峰值對(duì)應(yīng)的溫度約160°C。 （2）提出了SMA棒的一種通電加熱方法，通過加熱試驗(yàn)驗(yàn)證了其有效性，比較了兩種表面絕緣電熱絲的加熱效率。研究表明：第2種表面絕緣電熱絲的加熱效率明顯高于第1種表面絕緣電熱絲，，前者可在38min內(nèi)將本文所用SMA棒加熱至160°C。 （3）開展了兩組足尺盾構(gòu)隧道管片接頭的短期加固試驗(yàn)，驗(yàn)證了本文所提加固方法的可行性。研究表明：該加固方法可使管片接頭張開量降低37%~62%，接頭撓度減小21%~42%，混凝土受壓區(qū)邊緣應(yīng)變降低87%~96%，鋼螺栓受拉應(yīng)變減小67%~74%；加固前接頭張開量越小，加固效果越顯著。 （4）初步探討了本文所提加固方法的工程應(yīng)用問題，給出了相應(yīng)的解決方法，表明其實(shí)際工程應(yīng)用是可行的。
[Abstract]:The shield tunneling method has been widely used in subway tunnel, and the completed subway tunnel may cause segment joint to open for various reasons, which may lead to serious problems such as edge concrete crushing, tensile yield of steel bolt, water leakage and so on. In this paper, a short term reinforcement method of shield tunnel segment joint is proposed, that is, when the opening of the joint is too large, the pretreated shape memory alloy (Shape MemoryAlloy,) bolt is put into the reserved hole of adjacent segment and heated. The shape memory effect of SMA is used to provide a certain closed recovery force for the segment joint, which can reduce the opening of the joint and create favorable conditions for the subsequent long-term reinforcement. In this paper, the proposed short-term reinforcement methods are studied. The main work includes the following four aspects: (1) the restoring force test of SMA rod is carried out, which provides important basic data for the determination of the subsequent reinforcement test plan. The results show that when the pretension strain is 5.80, the peak value of the controlled recovery stress of the SMA rod used in this paper can reach about 380MPa, and the temperature corresponding to the peak value of the recovery stress is about 160 擄C. (2) an electric heating method for the SMA rod is proposed. The heating efficiency of two kinds of surface insulated electric heating wire was compared by heating test. The results show that the heating efficiency of the second kind of surface insulated electric heating wire is obviously higher than that of the first kind of surface insulated electric heating wire. The former can heat the SMA rod used in this paper to 160 擄C. (3) two groups of short-term reinforcement tests on the segment joint of full-scale shield tunnel have been carried out, and the feasibility of the proposed reinforcement method has been verified. The results show that this reinforcement method can reduce the opening amount of segment joint by 37% and 62%, decrease the deflection of the joint by 21% and 42%, reduce the strain at the edge of concrete compression zone by 87% and 96%, decrease the tensile strain of steel bolt by 6774%, and decrease the opening amount of joint before reinforcement. The reinforcement effect is more remarkable. (4) the engineering application of the reinforcement method proposed in this paper is discussed, and the corresponding solution is given, which shows that the practical engineering application is feasible.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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