高水壓砂土地層中泥水盾構(gòu)隧道開挖面失穩(wěn)機理與風(fēng)險評估研究
發(fā)布時間：2019-04-12 07:22
【摘要】：隨著我國地下空間的大規(guī)模開發(fā)利用,盾構(gòu)隧道工程的環(huán)境條件越來越復(fù)雜,施工中出現(xiàn)了諸多問題,其中較為突出的是支護壓力不足造成的開挖面失穩(wěn)及地層變形過大。特別是近年來我國水下盾構(gòu)隧道工程快速發(fā)展,由于覆土厚度一般較淺、水壓較大,開挖面穩(wěn)定難以控制,稍有不慎就有可能發(fā)生開挖面坍塌和水體倒灌等事故。因此,研究高水壓條件下盾構(gòu)隧道開挖面失穩(wěn)風(fēng)險具有現(xiàn)實意義。 本文結(jié)合南京地鐵10號線江心洲站～中間風(fēng)井區(qū)間過江隧道工程,通過理論分析、數(shù)值模擬以及現(xiàn)場調(diào)查和實測等方法,對高水壓條件下砂土地層中泥水盾構(gòu)隧道施工過程中的開挖面穩(wěn)定性相關(guān)問題進行了研究,主要工作和研究成果包括以下幾個方面： (1)利用Handy拱效應(yīng)理論和Mohr-Coulomb準則得出了失穩(wěn)土體形狀的計算方法,失穩(wěn)土體形狀類似貝殼形�；跇O限平衡分析理論建立了盾構(gòu)隧道開挖面穩(wěn)定性分析模型,并將模型的計算結(jié)果與其他理論分析方法、離心試驗以及數(shù)值模擬分析的結(jié)果進行了對比。提出了可用于指導(dǎo)施工的開挖面支護壓力極限值工程參考圖。 (2)利用FLAC3D有限差分程序計算了高水壓條件下砂土地層中大直徑泥水盾構(gòu)隧道開挖面支護壓力極限值,分析了砂土內(nèi)摩擦角、黏聚力、彈性模量、隧道埋深、直徑、水位等因素對開挖面支護壓力的影響,研究了失穩(wěn)破壞模式以及失穩(wěn)過程中土壓力的變化規(guī)律。結(jié)果表明,高水壓條件下開挖面支護壓力極限值比無水壓時增大約一個量級。 (3)借鑒W. Kent Muhlbauer提出的在管道風(fēng)險管理領(lǐng)域應(yīng)用廣泛的肯特法的基本思想,對泥水盾構(gòu)隧道開挖面失穩(wěn)風(fēng)險進行了分析,將風(fēng)險因素分為地質(zhì)指數(shù)、隧道指數(shù)、設(shè)計指數(shù)、施工指數(shù)等項,建立了風(fēng)險評估模型。修改肯特法中相關(guān)指數(shù)的評分準則,采用風(fēng)險指數(shù)先相加、再與后果系數(shù)相乘的算法計算相對風(fēng)險評估值,得分越高,風(fēng)險越大。 (4)結(jié)合南京地鐵10號線江心洲站～中間風(fēng)井區(qū)間過江隧道工程,利用本文建立的泥水盾構(gòu)隧道開挖面失穩(wěn)風(fēng)險評估模型,選取了開挖面失穩(wěn)風(fēng)險相對較大和較小的2個典型斷面進行了開挖面失穩(wěn)風(fēng)險評估,并根據(jù)評估結(jié)果分析了導(dǎo)致事故發(fā)生的主要風(fēng)險因素,給出了在施工過程中對盾構(gòu)施工參數(shù)進行有針對性的動態(tài)調(diào)整的建議。
[Abstract]:With the large-scale development and utilization of underground space in China, the environmental conditions of shield tunnel project are becoming more and more complex, and there are many problems in construction, especially the instability of excavation surface and excessive deformation of strata caused by insufficient support pressure. Especially in recent years, with the rapid development of underwater shield tunnel engineering in China, due to the shallow thickness of soil and high water pressure, it is difficult to control the stability of excavation surface. Some accidents such as the collapse of excavation surface and the backfilling of water body may occur when the excavation surface collapses. Therefore, it is of practical significance to study the risk of shield tunnel excavation surface instability under high water pressure. In this paper, through theoretical analysis, numerical simulation and on-the-spot investigation and measurement, this paper combines the Jiangxinzhou station-middle wind shaft tunnel project of Nanjing Metro Line 10 with the methods of theoretical analysis, numerical simulation, field investigation and measurement, etc. The problems related to the stability of excavated face during the construction of mud-water shield tunnel in sand-soil formation under high water pressure are studied in this paper. The main work and research results are as follows: (1) based on Handy's arch effect theory and Mohr-Coulomb 's criterion, the calculation method of unstable soil shape is obtained. The shape of unstable soil is similar to shell shape. Based on the theory of limit equilibrium analysis, the stability analysis model of shield tunnel excavation surface is established, and the calculation results of the model are compared with the results of other theoretical analysis methods, centrifugal tests and numerical simulation analysis. This paper puts forward the engineering reference drawing of the limit pressure value of the excavation face support which can be used to guide the construction. (2) FLAC3D finite difference program is used to calculate the limit value of support pressure in large diameter mud-water shield tunnel under the condition of high water pressure, and the internal friction angle, cohesion, elastic modulus, tunnel depth and diameter of sand are analyzed. The influence of water level and other factors on the supporting pressure of excavation surface is studied. The failure mode of instability and the variation rule of soil pressure in the process of instability are studied. The results show that the limit value of support pressure under high water pressure is about one order of magnitude higher than that without water pressure. (3) referring to the basic idea of Kent method, which is widely used in the field of pipeline risk management proposed by W. Kent Muhlbauer, this paper analyzes the risk of instability in the excavation surface of mud-water shield tunnel, and divides the risk factors into geological index, tunnel index and design index, and the risk factors are divided into geological index, tunnel index and design index. Construction index and other terms, established a risk assessment model. The relative risk evaluation value is calculated by adding risk index and multiplying the result coefficient. The higher the score is, the greater the risk is, the higher the score is, the more the risk is calculated by using the algorithm of adding risk index first and multiplying the result coefficient. (4) combined with the Jiangxinzhou station-middle wind shaft cross-river tunnel project of Nanjing Metro Line 10, the risk assessment model of mud-water shield tunnel excavation surface instability is established in this paper. In this paper, two typical sections with relatively large and small risk of excavation surface instability are selected to evaluate the risk of excavation surface instability, and the main risk factors leading to the accident are analyzed according to the evaluation results. Some suggestions for dynamic adjustment of shield construction parameters during construction are given.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U455.43
本文編號：2456825
[Abstract]:With the large-scale development and utilization of underground space in China, the environmental conditions of shield tunnel project are becoming more and more complex, and there are many problems in construction, especially the instability of excavation surface and excessive deformation of strata caused by insufficient support pressure. Especially in recent years, with the rapid development of underwater shield tunnel engineering in China, due to the shallow thickness of soil and high water pressure, it is difficult to control the stability of excavation surface. Some accidents such as the collapse of excavation surface and the backfilling of water body may occur when the excavation surface collapses. Therefore, it is of practical significance to study the risk of shield tunnel excavation surface instability under high water pressure. In this paper, through theoretical analysis, numerical simulation and on-the-spot investigation and measurement, this paper combines the Jiangxinzhou station-middle wind shaft tunnel project of Nanjing Metro Line 10 with the methods of theoretical analysis, numerical simulation, field investigation and measurement, etc. The problems related to the stability of excavated face during the construction of mud-water shield tunnel in sand-soil formation under high water pressure are studied in this paper. The main work and research results are as follows: (1) based on Handy's arch effect theory and Mohr-Coulomb 's criterion, the calculation method of unstable soil shape is obtained. The shape of unstable soil is similar to shell shape. Based on the theory of limit equilibrium analysis, the stability analysis model of shield tunnel excavation surface is established, and the calculation results of the model are compared with the results of other theoretical analysis methods, centrifugal tests and numerical simulation analysis. This paper puts forward the engineering reference drawing of the limit pressure value of the excavation face support which can be used to guide the construction. (2) FLAC3D finite difference program is used to calculate the limit value of support pressure in large diameter mud-water shield tunnel under the condition of high water pressure, and the internal friction angle, cohesion, elastic modulus, tunnel depth and diameter of sand are analyzed. The influence of water level and other factors on the supporting pressure of excavation surface is studied. The failure mode of instability and the variation rule of soil pressure in the process of instability are studied. The results show that the limit value of support pressure under high water pressure is about one order of magnitude higher than that without water pressure. (3) referring to the basic idea of Kent method, which is widely used in the field of pipeline risk management proposed by W. Kent Muhlbauer, this paper analyzes the risk of instability in the excavation surface of mud-water shield tunnel, and divides the risk factors into geological index, tunnel index and design index, and the risk factors are divided into geological index, tunnel index and design index. Construction index and other terms, established a risk assessment model. The relative risk evaluation value is calculated by adding risk index and multiplying the result coefficient. The higher the score is, the greater the risk is, the higher the score is, the more the risk is calculated by using the algorithm of adding risk index first and multiplying the result coefficient. (4) combined with the Jiangxinzhou station-middle wind shaft cross-river tunnel project of Nanjing Metro Line 10, the risk assessment model of mud-water shield tunnel excavation surface instability is established in this paper. In this paper, two typical sections with relatively large and small risk of excavation surface instability are selected to evaluate the risk of excavation surface instability, and the main risk factors leading to the accident are analyzed according to the evaluation results. Some suggestions for dynamic adjustment of shield construction parameters during construction are given.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U455.43
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