本文選題：錨具槽　切入點(diǎn)：預(yù)應(yīng)力混凝土襯砌　出處：《天津大學(xué)》2014年碩士論文

【摘要】：無(wú)粘結(jié)環(huán)錨預(yù)應(yīng)力襯砌結(jié)構(gòu)是應(yīng)用在水工隧洞中的一種新型結(jié)構(gòu)形式，該結(jié)構(gòu)主要適用于襯砌圍巖地質(zhì)條件較差、襯砌中的水壓力較大以及襯砌開裂水滲入圍巖后能夠?qū)е轮車ㄖ锸Х�(wěn)的水工隧洞結(jié)構(gòu)中。無(wú)粘結(jié)預(yù)應(yīng)力襯砌結(jié)構(gòu)作為一種新型的襯砌結(jié)構(gòu)形式具有其特殊的優(yōu)點(diǎn)：無(wú)粘結(jié)襯砌中鋼絞線采用雙圈環(huán)繞形式，能夠使襯砌中的壓應(yīng)力分布更均勻，錨索的沿程預(yù)應(yīng)力損失更小，，與有粘結(jié)襯砌相比有效預(yù)壓應(yīng)力大，襯砌的厚度可以適當(dāng)減小，這樣就能夠節(jié)省材料減小開挖量，大大降低了施工的難度和工程造價(jià)，有效的加快施工的進(jìn)度。鑒于無(wú)粘結(jié)環(huán)錨預(yù)應(yīng)力混凝土襯砌的優(yōu)勢(shì)，可以看出這種結(jié)構(gòu)在我國(guó)水工隧洞中有著廣闊的應(yīng)用前景。目前，這種襯砌形式只在小浪底工程的三條排沙洞和大伙房水庫(kù)輸水隧洞中得到應(yīng)用，從這兩個(gè)工程的運(yùn)行情況來(lái)看，該結(jié)構(gòu)也暴露出一些問(wèn)題，尤其是錨具槽部位，通過(guò)對(duì)小浪底工程試驗(yàn)段進(jìn)行觀測(cè)發(fā)現(xiàn)，小浪底錨具槽存在漏油現(xiàn)象，錨具槽部位是整個(gè)結(jié)構(gòu)的薄弱環(huán)節(jié)。 本文主要應(yīng)用ANSYS有限元分析軟件對(duì)小浪底2號(hào)排沙洞建模分析，分別對(duì)錨索張拉階段的施工期和加水壓后的運(yùn)行期的錨具槽區(qū)域的應(yīng)力狀態(tài)進(jìn)行分析，并將施工期的結(jié)果與2號(hào)排沙洞試驗(yàn)段的監(jiān)測(cè)數(shù)據(jù)進(jìn)行對(duì)比，看出兩者具有很好的一致性。計(jì)算結(jié)果表明，錨具槽部位的受力狀態(tài)是整個(gè)結(jié)構(gòu)最復(fù)雜的，最大最小環(huán)向應(yīng)力均出現(xiàn)在錨具槽附近，軸向和徑向還出現(xiàn)了較小的拉應(yīng)力。為了解決這個(gè)問(wèn)題，本文在最后一章對(duì)錨具槽位置做了優(yōu)化，并對(duì)其進(jìn)行施工期和運(yùn)行期的有限元分析，從結(jié)果可以看出，優(yōu)化后的結(jié)構(gòu)薄弱區(qū)范圍明顯減小，錨具槽附近的應(yīng)力分布更均勻，對(duì)于今后的工程具有一定的參考價(jià)值。
[Abstract]:Unbonded ring anchor prestressed lining structure is a new type of structure used in hydraulic tunnel. The structure is mainly suitable for the poor geological conditions of surrounding rock of lining. As a new type of lining structure, unbonded prestressed lining structure has its own special characteristics, such as high water pressure in lining and cracking water infiltration into surrounding rock, which can lead to instability of surrounding buildings. Advantages: the steel strands in the unbonded lining are in the form of double rings. It can make the distribution of compressive stress in lining more uniform, and the loss of prestress along the Anchorage cable is smaller. Compared with the bonded lining, the effective preloading stress is larger, and the thickness of the lining can be reduced appropriately, which can save the material and reduce the excavation amount. It greatly reduces the construction difficulty and construction cost, effectively speeds up the construction progress. In view of the advantages of unbonded ring anchor prestressed concrete lining, it can be seen that this kind of structure has a broad application prospect in hydraulic tunnels in China. This type of lining is only used in the three sand discharge tunnels of Xiaolangdi Project and the water conveyance tunnel of Dahuofang Reservoir. Judging from the operation of these two projects, the structure also exposes some problems, especially the part of the Anchorage slot. By observing the test section of Xiaolangdi project, it is found that the leakage of oil exists in the Anchorage trough of Xiaolangdi, and the position of the Anchorage slot is the weak link of the whole structure. In this paper, the ANSYS finite element analysis software is mainly used to model and analyze the sand discharge tunnel No. 2 in Xiaolangdi. The stress state of the anchoring slot area during the construction period of the cable tension stage and the running period after adding water pressure is analyzed respectively. By comparing the results of the construction period with the monitoring data of the test section of No. 2 sand discharge tunnel, it is found that there is a good agreement between the two. The calculation results show that the stress state of the Anchorage slot is the most complex of the whole structure. In order to solve this problem, the maximum and minimum circumferential stresses appear near the Anchorage slot, and the axial and radial tensile stresses are smaller. In order to solve this problem, the position of the Anchorage slot is optimized in the last chapter. The finite element analysis of the structure during the construction period and the running period shows that the scope of the weak area of the structure after optimization is obviously reduced and the stress distribution near the Anchorage slot is more uniform, which has certain reference value for the future engineering.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV554

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