黃土地鐵隧道盾構(gòu)開挖面穩(wěn)定性研究
發(fā)布時(shí)間：2019-03-02 11:18
【摘要】：隨著地下空間的不斷開發(fā),盾構(gòu)施工技術(shù)得到了越來越廣泛的應(yīng)用,其中土壓平衡式盾構(gòu)掘進(jìn)技術(shù)以其安全、高效、環(huán)保及對周圍環(huán)境影響較小等優(yōu)點(diǎn)而廣泛應(yīng)用于隧道工程。盾構(gòu)施工過程中,由于土層條件和掘進(jìn)參數(shù)的不斷變化,使得實(shí)際掘進(jìn)過程中盾構(gòu)機(jī)的支護(hù)力不是完全滿足開挖面平衡的要求。所以為確保開挖面的穩(wěn)定性及施工對周圍土體較小的影響,需要研究支護(hù)力的變化對開挖面穩(wěn)定性的影響以及對地層、地表變形的影響,進(jìn)而確定確保開挖面穩(wěn)定的極限支護(hù)力,并對實(shí)際工程提供借鑒意義。本文依托西安地鐵項(xiàng)目,采用有限元軟件ABAQUS進(jìn)行盾構(gòu)隧道開挖面支護(hù)模擬,研究了支護(hù)力不足及過大時(shí)開挖面的失穩(wěn)模式,開挖面周圍土體塑性區(qū)開展以及地層、地表變形特性,并對在支護(hù)力不足情況下影響開挖面穩(wěn)定性的主要因素如隧道埋深、隧道直徑、地層的強(qiáng)度參數(shù)c、φ進(jìn)行影響性分析,給出規(guī)律性結(jié)論。本文針對以上問題,主要進(jìn)行了以下研究工作:(1)闡述了土壓式盾構(gòu)法施工的主要技術(shù)環(huán)節(jié),確定了本文研究的技術(shù)環(huán)節(jié)為開挖面支護(hù)力的控制。闡述了盾構(gòu)施工對周圍環(huán)境的主要影響,確定了本文數(shù)值模擬輸出的主要結(jié)果。闡述了盾構(gòu)開挖過程中前方土體的三種應(yīng)力狀態(tài),分析了支護(hù)力的大小與土體應(yīng)力狀態(tài)的對應(yīng)關(guān)系。闡述了支護(hù)壓力的設(shè)置原則,確定了數(shù)值模式時(shí),在不考慮推進(jìn)阻力和地下水壓力時(shí),開挖面支護(hù)壓力的計(jì)算公式。(2)對比常用的土體強(qiáng)度準(zhǔn)則,選擇較為常用且合理的Mohr-Coulomb強(qiáng)度準(zhǔn)則,設(shè)計(jì)了合理的開挖面穩(wěn)定性模擬方案,分為地應(yīng)力平衡,開挖區(qū)應(yīng)力釋放,開挖土體及拼裝管片,改變開挖面支護(hù)壓力四個(gè)分析步。(3)利用ABAQUS有限元軟件,依托西安地鐵六號(hào)線一期工程巖土勘察報(bào)告,選取合理的地層及管片參數(shù),建立黃土地層下的半空間三維隧道模型。分別模擬當(dāng)支護(hù)壓力不足和過大時(shí),開挖面的失穩(wěn)模式,周圍土體的應(yīng)力及變形規(guī)律,塑性區(qū)發(fā)展規(guī)律以及地層、地表的變形規(guī)律。并給出本文開挖面最小極限支護(hù)壓力的判別標(biāo)準(zhǔn)。(4)在黃土地層條件下,在支護(hù)力不足情況下,選取對開挖面穩(wěn)定性影響較大的因素即隧道的埋深、直徑、土體的c、φ進(jìn)行影響性分析,研究極限支護(hù)壓力比隨上述參數(shù)的變化規(guī)律。并研究在極限支護(hù)壓力作用下,開挖面變形、開挖面塑性區(qū)開展、地層及地表沉降隨上述參數(shù)的變化規(guī)律。
[Abstract]:With the continuous development of underground space, shield construction technology has been more and more widely used, in which soil pressure balance shield tunneling technology for its safety, high efficiency, environmental protection and small impact on the surrounding environment and other advantages, widely used in tunnel engineering. In the course of shield construction, the support force of shield machine does not fully meet the requirement of the balance of excavation surface due to the continuous change of soil layer conditions and tunneling parameters. Therefore, in order to ensure the stability of the excavation surface and the small influence of construction on the surrounding soil, it is necessary to study the influence of the change of support force on the stability of the excavation surface, as well as on the formation and surface deformation. Furthermore, the ultimate support force to ensure the stability of excavation surface is determined, and it can be used for reference in practical engineering. Based on Xi'an metro project, this paper uses finite element software ABAQUS to simulate the excavation surface support of shield tunnel, and studies the unstable mode of excavation surface when the support force is insufficient and too large, the development of plastic zone of soil around the excavation surface and the stratum. The main factors affecting the stability of excavation surface, such as tunnel depth, tunnel diameter, strength parameter c and 蠁, are analyzed under the condition of insufficient support force, and the regular conclusions are given. In view of the above problems, this paper mainly carried on the following research work: (1) elaborated the main technical link of the earth pressure shield method construction, determined that the technical link of this paper is the excavation surface support protection force control. This paper expounds the main influence of shield construction on the surrounding environment, and determines the main results of numerical simulation output in this paper. Three kinds of stress states in front of soil during shield excavation are described, and the corresponding relationship between support force and stress state of soil is analyzed. The setting principle of supporting pressure is expounded, and the calculation formula of supporting pressure on excavation surface is determined when the numerical model is not considering propulsion resistance and groundwater pressure. (2) comparing with the common soil strength criterion, Choosing the common and reasonable Mohr-Coulomb strength criterion, the reasonable stability simulation scheme of the excavation surface is designed, which is divided into in-situ stress balance, stress release in the excavation area, excavation soil mass and assembled pipe segments. (3) using the ABAQUS finite element software and relying on the first-phase geotechnical investigation report of Xi'an Metro Line 6, the reasonable stratum and segment parameters are selected, and the supporting pressure of the excavation face is changed four steps. (3) the finite element software ABAQUS is used to select the reasonable stratum and segment parameters. A three-dimensional half-space tunnel model under loess stratum is established. When the support pressure is insufficient and too large, the unstable mode of the excavation surface, the stress and deformation law of the surrounding soil, the development law of the plastic zone and the deformation law of the stratum and the surface are simulated respectively. (4) under the condition of loess stratum, under the condition of insufficient supporting force, the factors influencing the stability of excavated face are selected, namely, the depth of tunnel, the diameter of tunnel, the soil mass c, and so on, which are the main factors that affect the stability of excavated face, such as the depth of tunnel, the diameter of tunnel and the soil mass c, under the condition of loess stratum. The influence of 蠁 is analyzed, and the variation rule of pressure ratio of limit support with the above parameters is studied. Under the action of ultimate support pressure, the deformation of excavation surface, the development of plastic zone of excavation surface, and the variation of stratum and surface settlement with the above parameters are studied.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.43;U231.3
本文編號(hào)：2433000
[Abstract]:With the continuous development of underground space, shield construction technology has been more and more widely used, in which soil pressure balance shield tunneling technology for its safety, high efficiency, environmental protection and small impact on the surrounding environment and other advantages, widely used in tunnel engineering. In the course of shield construction, the support force of shield machine does not fully meet the requirement of the balance of excavation surface due to the continuous change of soil layer conditions and tunneling parameters. Therefore, in order to ensure the stability of the excavation surface and the small influence of construction on the surrounding soil, it is necessary to study the influence of the change of support force on the stability of the excavation surface, as well as on the formation and surface deformation. Furthermore, the ultimate support force to ensure the stability of excavation surface is determined, and it can be used for reference in practical engineering. Based on Xi'an metro project, this paper uses finite element software ABAQUS to simulate the excavation surface support of shield tunnel, and studies the unstable mode of excavation surface when the support force is insufficient and too large, the development of plastic zone of soil around the excavation surface and the stratum. The main factors affecting the stability of excavation surface, such as tunnel depth, tunnel diameter, strength parameter c and 蠁, are analyzed under the condition of insufficient support force, and the regular conclusions are given. In view of the above problems, this paper mainly carried on the following research work: (1) elaborated the main technical link of the earth pressure shield method construction, determined that the technical link of this paper is the excavation surface support protection force control. This paper expounds the main influence of shield construction on the surrounding environment, and determines the main results of numerical simulation output in this paper. Three kinds of stress states in front of soil during shield excavation are described, and the corresponding relationship between support force and stress state of soil is analyzed. The setting principle of supporting pressure is expounded, and the calculation formula of supporting pressure on excavation surface is determined when the numerical model is not considering propulsion resistance and groundwater pressure. (2) comparing with the common soil strength criterion, Choosing the common and reasonable Mohr-Coulomb strength criterion, the reasonable stability simulation scheme of the excavation surface is designed, which is divided into in-situ stress balance, stress release in the excavation area, excavation soil mass and assembled pipe segments. (3) using the ABAQUS finite element software and relying on the first-phase geotechnical investigation report of Xi'an Metro Line 6, the reasonable stratum and segment parameters are selected, and the supporting pressure of the excavation face is changed four steps. (3) the finite element software ABAQUS is used to select the reasonable stratum and segment parameters. A three-dimensional half-space tunnel model under loess stratum is established. When the support pressure is insufficient and too large, the unstable mode of the excavation surface, the stress and deformation law of the surrounding soil, the development law of the plastic zone and the deformation law of the stratum and the surface are simulated respectively. (4) under the condition of loess stratum, under the condition of insufficient supporting force, the factors influencing the stability of excavated face are selected, namely, the depth of tunnel, the diameter of tunnel, the soil mass c, and so on, which are the main factors that affect the stability of excavated face, such as the depth of tunnel, the diameter of tunnel and the soil mass c, under the condition of loess stratum. The influence of 蠁 is analyzed, and the variation rule of pressure ratio of limit support with the above parameters is studied. Under the action of ultimate support pressure, the deformation of excavation surface, the development of plastic zone of excavation surface, and the variation of stratum and surface settlement with the above parameters are studied.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.43;U231.3
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