本文選題：斷層 + 埋地管道�。� 參考：《華北理工大學》2017年碩士論文

【摘要】：埋地管道是為人們供暖、供水以及輸送石油、天然氣等的重要手段,與人們生活有密切的聯(lián)系。但是多次震害表明,斷層對埋地管道的破壞作用非常大,而接口位置又是管道的薄弱部位。所以研究斷層錯動對埋地管道接口力學性能的影響就顯得十分必要。本文通過室內(nèi)三箱裝置的加載試驗,模擬各種斷層作用,研究埋地管道接口的力學反應(yīng)。將鋼質(zhì)管道埋置于項目組自行研發(fā)的土箱體內(nèi),向管道內(nèi)充入2.5MPa的常溫自來水,利用MTS設(shè)備和千斤頂裝置使箱體產(chǎn)生不同方向的位移,從而模擬斷層錯動。斷層類型分別為正斷層、逆斷層和走滑斷層,接口類型分別為焊接、螺紋連接和法蘭連接;接口位置分別在斷層處和非斷層處。并與無接口管道和無壓力管道的試驗結(jié)果進行對比。模擬正、逆斷層試驗中,根據(jù)管道埋設(shè)所經(jīng)過的箱體數(shù)量,分為兩箱體模型和三箱體模型。通過分析管道各處應(yīng)變、管道位移、水壓與箱體位移之間的關(guān)系,得出斷層作用下埋地管道接口的變形與破壞規(guī)律,主要結(jié)論如下:焊接接口在正斷層、逆斷層和走滑斷層分別作用下變形最小,并且強度略高于直管,與管道保持較高的一致性,有一定抵抗大位移斷層的能力,并可以保持管內(nèi)水壓穩(wěn)定,所以埋地管道最適宜用焊接接口。螺紋接口在正斷層、逆斷層和走滑斷層分別作用下變形比直管大,斷層位移較小時管道在斷層處位移最小,可以保持管內(nèi)水壓穩(wěn)定,斷層位移較大時管內(nèi)水壓會有輕微泄露,所以斷層位移較小時可用螺紋接口連接管道。法蘭接口在走滑斷層作用下會發(fā)生嚴重破壞,管內(nèi)水壓急降,所以不宜選擇法蘭接口連接管道。埋地管道變形最大的部位在斷層兩側(cè)一定距離(本文為100mm到500mm之間,接近300mm),且應(yīng)變隨著斷層位移的增大而增大,所以接口埋設(shè)應(yīng)盡量避開此處。對比正、逆斷層作用下兩種箱體模型,無論接口位置在哪,三箱體模型中的管道接口下表面更容易破壞,兩箱體模型中接口靠近固定區(qū)的一側(cè)更容易破壞。管內(nèi)有2.5MPa穩(wěn)定水壓的管道比無內(nèi)壓的管道變形大,更容易破壞,需加強保護。
[Abstract]:Buried pipeline is an important means of heating, supplying water and transporting oil and natural gas, which is closely related to people's life.But many times of earthquake damage show that the fault has great damage to buried pipeline, and the interface position is the weak part of pipeline.Therefore, it is necessary to study the effect of fault dislocation on the mechanical properties of buried pipeline interface.In this paper, the mechanical reaction of buried pipeline interface is studied through the loading test of three boxes in the laboratory to simulate the action of various faults.The steel pipe is buried in the earth box developed by the project group and filled with the normal temperature tap water of 2.5MPa. The displacement of the box in different directions is made by using MTS equipment and Jack device, and the fault dislocation is simulated.The types of faults are normal faults, reverse faults and strike-slip faults, and the types of joints are welding, threaded connections and flange connections, respectively, and the positions of the joints are at the fault and non-fault, respectively.The results are compared with the test results of no interface pipe and no pressure pipeline.According to the number of tanks embedded in the pipeline, there are two box models and three box models in the simulated normal and reverse fault tests.By analyzing the relationship between the strain, displacement, water pressure and displacement of the box, the deformation and failure law of buried pipeline interface under the action of fault are obtained. The main conclusions are as follows: welding interface is on the normal fault,Under the action of reverse fault and strike-slip fault respectively, the deformation is minimum, and the strength is slightly higher than that of the straight pipe, which keeps high consistency with the pipeline, and has the ability to resist the large displacement fault, and can keep the water pressure in the pipe stable.So buried pipeline is the most suitable to use welding interface.Under the action of normal fault, reverse fault and strike-slip fault, the threaded interface deformation is larger than that of the straight pipe, and the pipeline with small fault displacement is the smallest displacement at the fault, which can keep the water pressure in the pipe stable, and there will be slight leakage of the water pressure in the pipe when the fault displacement is large.So the fault displacement can be connected to the pipe with thread interface when the displacement is small.The flange interface will be seriously damaged under the action of strike-slip fault, and the water pressure in the pipe will drop sharply, so it is not advisable to choose the flange interface to connect the pipe.The maximum deformation of buried pipeline is located at a certain distance between the two sides of the fault (in this paper, between 100mm and 500mm, it is close to 300mm, and the strain increases with the increase of fault displacement, so the interface embedding should avoid it as far as possible.Compared with the two box models under the action of positive and reverse faults, no matter where the interface position is, the surface of the pipe interface in the three-box model is easier to destroy, and the side of the interface near the fixed area is easier to destroy in the two box models.The pipe with 2.5MPa stable water pressure is more deformed than the pipe without internal pressure, so it needs to be protected.
【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U173

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