本文選題：黃土　切入點(diǎn)：填方區(qū)域　出處：《西安科技大學(xué)》2017年碩士論文

【摘要】：在我國溝壑縱橫的黃土高原地區(qū)城市化進(jìn)程中,黃土填方是必不可少的一種典型而又普遍的工程措施。填方土體不均勻沉降必然會(huì)導(dǎo)致穿越填方區(qū)管線出現(xiàn)變形甚至破壞,因此研究穿越黃土填方區(qū)域埋地管線變形特性很有必要。以延安某填方區(qū)直埋管線為研究對象,通過收集資料及現(xiàn)場調(diào)查,歸納填方區(qū)域沉降特征,總結(jié)管線的變形模式,建立力學(xué)模型,得出管線力學(xué)變形破壞機(jī)制。分別對穿越不同形式填方區(qū)域管線開展室內(nèi)模型試驗(yàn),得到填方土體不均勻沉降差時(shí)管線位移、應(yīng)變以及下部土壓力的變化規(guī)律。最后,通過MIDAS軟件進(jìn)行數(shù)值模擬,進(jìn)一步研究穿越黃土填方區(qū)域埋地管線變形特性。研究取得如下成果:(1)通過現(xiàn)場調(diào)查,歸納填方區(qū)域沉降形式有:填方“斜線形”沉降形式、填方“凸形”沉降形式、填方“凹形”沉降形式以及三種的組合形式。(2)提出穿越填方區(qū)域埋地管線的變形模式:剪切變形模式、撬曲變形模式、梁式受壓變形模式、扭轉(zhuǎn)變形模式以及受壓失穩(wěn)變形模式。(3)通過穿越填方“斜線形”沉降區(qū)域管線模型試驗(yàn)得出,隨填方土體沉降,管線最大位移發(fā)生在填方沉降區(qū)域距離不均勻沉降面最遠(yuǎn)端;不均勻沉降面處管線位移變化幅度較大,管線沉降位移曲線整體呈“S”形變化。管線上表面在整個(gè)試驗(yàn)過程中均受拉應(yīng)力影響,不均勻沉降面處拉應(yīng)力最大,填方沉降區(qū)拉應(yīng)力最小。管線下部土壓力在不均勻沉降面處減小幅度最大,填方沉降區(qū)管線處于懸空狀態(tài)。該模式下管線的變形主要為撬曲變形模式。(4)通過穿越填方“凸形”沉降區(qū)域管線模型試驗(yàn),隨填方土體沉降,管線最大位移發(fā)生在兩側(cè)填方沉降區(qū)管線端部;不均勻沉降面處管線位移變化幅度較大,管線沉降曲線整體以填方相對穩(wěn)定區(qū)中點(diǎn)呈拋物線形狀。管線上表面應(yīng)變值在兩側(cè)填方沉降區(qū)為負(fù)值,中間填方相對穩(wěn)定區(qū)為正值;管線應(yīng)變最大值發(fā)生在模型中間填方相對穩(wěn)定區(qū)中點(diǎn),且呈對稱分布。管線下部土壓力在不均勻沉降面處減小幅度最大,管線在兩側(cè)填方沉降區(qū)域處于懸空狀態(tài)。(5)通過穿越填方“凹形”沉降區(qū)域管線模型試驗(yàn),隨填方土體沉降,管線最大位移發(fā)生在模型中間填方沉降區(qū)中點(diǎn);不均勻沉降面處管線位移變化幅度較大,管線沉降曲線整體以填方沉降區(qū)中點(diǎn)呈拋物線形狀。管線上表面應(yīng)變值在填方沉降區(qū)為負(fù)值,兩側(cè)填方相對穩(wěn)定區(qū)為正值;管線應(yīng)變最大值發(fā)生在填方沉降區(qū)中點(diǎn),且呈對稱分布。管線下部土壓力在不均勻沉降面處減小幅度最大,在沉降過程中,管線在填方沉降區(qū)域處于懸空狀態(tài)。
[Abstract]:Loess fill is a typical and universal engineering measure in the urbanization process of gully and horizontal loess plateau in our country. Uneven settlement of fill soil will inevitably lead to deformation and even destruction of pipeline crossing the fill area. Therefore, it is necessary to study the deformation characteristics of buried pipeline in the loess filling area. Taking the buried pipeline in a certain filling area in Yan'an as the research object, the settlement characteristics of the filling area are summed up by collecting data and field investigation, and the deformation mode of the pipeline is summarized. The mechanical model was established and the mechanical deformation failure mechanism of pipeline was obtained. Indoor model tests were carried out on the pipeline through different types of filling area, and the pipeline displacement was obtained when the uneven settlement of fill soil was different. Finally, through the numerical simulation of MIDAS software, the deformation characteristics of buried pipeline through loess fill area are further studied. The research results are as follows: 1) through field investigation, The regional settlement of the fill is summarized as follows: the settlement form of the filling is "inclined line", the form of settlement of the filling is "convex", The "concave" settlement form of the fill and three kinds of combination form. 2) proposed the deformation mode of the buried pipeline through the filling area: shear deformation mode, pry deformation mode, beam compression deformation mode, Torsional deformation mode and compression instability deformation mode. 3) through the pipeline model test of "inclined line" settlement area, it is concluded that the maximum displacement of pipeline occurs at the farthest end of the uneven settlement surface with the settlement of the fill soil. The displacement of pipeline at uneven settlement surface is larger, and the displacement curve of pipeline is "S" shape. The upper surface of pipeline is affected by tensile stress in the whole process of test, and the tensile stress at uneven settlement surface is the largest. The tensile stress in the settlement area of the fill is the smallest, and the earth pressure in the lower part of the pipeline decreases the most at the uneven settlement surface. The pipeline in the settlement area is in a suspended state. The deformation of the pipeline is mainly pry deformation mode. 4) through the model test of pipeline passing through the "convex" settlement area of the fill, the settlement of the soil is accompanied by the settlement of the soil. The maximum displacement of the pipeline occurs at the end of the pipeline in the settlement area of both sides of the fill, and the displacement of the pipeline varies greatly at the uneven settlement surface. The settlement curve of pipeline takes the shape of parabola at the middle point of the relative stable region of the fill. The strain value of the surface of the pipeline is negative in the settlement area of both sides of the fill, and the relative stable zone of the intermediate filling is positive. The maximum strain of pipeline occurs at the middle point of the relative stable region in the middle of the model, and the distribution is symmetrical, and the earth pressure of the lower part of the pipeline decreases the most at the uneven settlement surface. The pipeline is suspended in the settlement area of both sides of the fill.) through the model test of pipeline passing through the "concave" settlement area of the fill, the maximum displacement of the pipeline occurs in the middle of the settlement area of the model with the settlement of the filling soil. The displacement of pipeline varies greatly at uneven settlement surface. The whole settlement curve of pipeline is parabola shape in the middle of the settlement area. The strain value of the upper surface of the pipeline is negative in the settlement area of the filling, and the relative stable region of the two sides of the fill is positive. The maximum strain of pipeline occurs at the midpoint of the settlement area and is symmetrical distributed. The earth pressure of the lower part of the pipeline decreases the most at the uneven settlement surface. In the process of settlement, the pipeline is suspended in the settlement area of the fill.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU990.3

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