成都泥巖地層盾構施工控制技術研究
發(fā)布時間：2018-11-21 13:52
【摘要】：隨著經(jīng)濟的發(fā)展,我國進入了地鐵修建的高峰期。與此同時,地鐵的修建改變了地層位移場和應力場的分布,導致鄰近建筑物產(chǎn)生附加變形和內(nèi)力,影響建筑物的可靠性,而盾構施工法是目前地鐵施工中普遍使用的施工方法,因此盾構施工對地層變形及鄰近建筑物的影響及如何控制這些影響成為當前地下空間開發(fā)利用遇到的重要問題。本文采用工程類比、理論推導和現(xiàn)場實驗等方法,對此問題進行了研究,主要研究內(nèi)容及結論包括:1、對盾構施工誘發(fā)地層擾動及變形機理進行了理論分析,并將誘發(fā)因素分為兩大類:力學作用及地層損失作用。其中力學作用主要考慮了盾構機刀盤正面對工作面的附加推力q、刀盤正面摩擦力fd、盾殼摩擦力fs及盾尾注漿壓力p;而地層損失主要考慮由盾尾間隙引起。對Mindlin解析式進行積分推導,得到了力學作用的三維地層位移解析公式;結合Loganathan二維土體位移解與Verruijit的三維位移解,推導了非等量徑向位移模式地層三維位移解。2、力學作用與地層損失對土體位移的量化分析對比結果表明地層損失引起的地層位移占總位移的95%左右。通常采用盾尾同步注漿及二次注漿工藝來減小地層損失從而達到控制地層位移的目的,但由于注漿液硬化后體積收縮導致盾尾間隙無法得到完全填充,漿液體積收縮率范圍為8.4%～9.8%,因此在滲透性較差的地層中,注漿量約為理論注漿量的1.1倍,隨著地層滲透性的增加,注漿量要適當?shù)脑黾印?、采用基于協(xié)同作用彈性地基梁模型與基于受約束協(xié)同作用彈性剪彎梁模型研究分析了鄰近建筑物受地層位移影響產(chǎn)生的附加位移與附加內(nèi)力,研究結果表明:地基基床系數(shù)小、建筑物整體剛度小的建筑物能夠更好的適應盾構施工的擾動;對于整體剛度較大的建筑物,盾構施工對結構內(nèi)力的影響較為明顯,而對建筑物傾斜的影響較小;4、運用兩階段法研究分析了鄰近樁基受盾構施工的影響,研究發(fā)現(xiàn)鄰近樁基附加內(nèi)力對樁隧間距反應敏感,根據(jù)樁基附加內(nèi)力與樁隧間距的變化關系將隧道周圍土體劃分為強影響區(qū)、弱影響區(qū)及無影響區(qū)并給出了劃分標準。5、研究分析了泡沫劑改良渣土的微觀機理及泡沫半衰期的影響因素,并將研究結果成功運用于解決本文依托工程出現(xiàn)的問題。實踐表明:采用泡沫劑改良含水量低的泥巖時,若刀盤噴水不足時,渣土將呈塊狀且傳輸時出現(xiàn)打滑現(xiàn)象,盾構掘進速度慢;加大刀盤噴水后渣土流塑性得到改善,盾構掘進速度也明顯得到提高。
[Abstract]:With the development of economy, our country has entered the peak period of subway construction. At the same time, the construction of subway has changed the distribution of ground displacement field and stress field, resulting in additional deformation and internal force of adjacent buildings, which affects the reliability of buildings. The shield construction method is widely used in subway construction at present. Therefore, the influence of shield construction on formation deformation and adjacent buildings and how to control these effects have become an important problem in the development and utilization of underground space. In this paper, engineering analogy, theoretical derivation and field experiments are used to study this problem. The main research contents and conclusions are as follows: 1. The mechanism of formation disturbance and deformation induced by shield construction is analyzed theoretically. The induced factors are divided into two categories: mechanical action and formation loss. The mechanical effect mainly considers the additional thrust Q of the face facing the cutter head of shield machine, the friction force of the fd, shield shell on the front side of the cutter head and the grouting pressure p of the shield tail, while the formation loss is mainly caused by the shield tail clearance. Based on the integral derivation of the Mindlin analytic formula, the analytical formula of three-dimensional stratum displacement is obtained. Combined with Loganathan's two-dimensional soil displacement solution and Verruijit's three-dimensional displacement solution, the three-dimensional displacement solution of heterogeneous radial displacement model is derived. 2. The quantitative analysis of soil displacement caused by mechanical action and formation loss shows that the formation displacement caused by formation loss accounts for about 95% of the total displacement. In order to reduce the formation loss and control the formation displacement, the synchronous grouting and secondary grouting are usually used to control the formation displacement. However, due to the volume shrinkage of the grouting fluid after hardening, the shield tail clearance can not be completely filled. The volume shrinkage rate of the slurry is 8.4 / 9.8. therefore, in the stratum with poor permeability, the grouting volume is about 1.1 times that of the theoretical grouting quantity. With the increase of the permeability of the formation, the grouting quantity should be increased appropriately. The additional displacement and additional internal force caused by ground displacement in adjacent buildings are studied by using the model of elastic foundation beam based on synergetic action and the model of elastic shear beam based on constrained synergistic action. The results show that the coefficient of foundation bed is small. The small stiffness of the whole building can better adapt to the disturbance of shield construction; For the buildings with larger overall stiffness, the shield construction has a more obvious effect on the internal force of the structure, while the influence on the inclination of the building is relatively small. 4. The influence of shield construction on adjacent pile foundation is analyzed by using two-stage method. It is found that the additional internal force of adjacent pile foundation is sensitive to the response of pile tunneling spacing. According to the relationship between the additional internal force of pile foundation and the distance between pile and tunnel, the soil around the tunnel is divided into strong influence area, weak influence zone and unaffected area, and the dividing standard is given. The microcosmic mechanism of foaming agent modified residue and the influencing factors of foam half-life were analyzed, and the results were successfully applied to solve the problems in this paper. The practice shows that when the foam agent is used to improve the mudstone with low water content, if the blade head is short of water spray, the residual soil will be block and slip when it is transported, and the speed of shield tunneling will be slow; The residual soil flow plasticity is improved and the speed of shield tunneling is improved obviously.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43
本文編號：2347167
[Abstract]:With the development of economy, our country has entered the peak period of subway construction. At the same time, the construction of subway has changed the distribution of ground displacement field and stress field, resulting in additional deformation and internal force of adjacent buildings, which affects the reliability of buildings. The shield construction method is widely used in subway construction at present. Therefore, the influence of shield construction on formation deformation and adjacent buildings and how to control these effects have become an important problem in the development and utilization of underground space. In this paper, engineering analogy, theoretical derivation and field experiments are used to study this problem. The main research contents and conclusions are as follows: 1. The mechanism of formation disturbance and deformation induced by shield construction is analyzed theoretically. The induced factors are divided into two categories: mechanical action and formation loss. The mechanical effect mainly considers the additional thrust Q of the face facing the cutter head of shield machine, the friction force of the fd, shield shell on the front side of the cutter head and the grouting pressure p of the shield tail, while the formation loss is mainly caused by the shield tail clearance. Based on the integral derivation of the Mindlin analytic formula, the analytical formula of three-dimensional stratum displacement is obtained. Combined with Loganathan's two-dimensional soil displacement solution and Verruijit's three-dimensional displacement solution, the three-dimensional displacement solution of heterogeneous radial displacement model is derived. 2. The quantitative analysis of soil displacement caused by mechanical action and formation loss shows that the formation displacement caused by formation loss accounts for about 95% of the total displacement. In order to reduce the formation loss and control the formation displacement, the synchronous grouting and secondary grouting are usually used to control the formation displacement. However, due to the volume shrinkage of the grouting fluid after hardening, the shield tail clearance can not be completely filled. The volume shrinkage rate of the slurry is 8.4 / 9.8. therefore, in the stratum with poor permeability, the grouting volume is about 1.1 times that of the theoretical grouting quantity. With the increase of the permeability of the formation, the grouting quantity should be increased appropriately. The additional displacement and additional internal force caused by ground displacement in adjacent buildings are studied by using the model of elastic foundation beam based on synergetic action and the model of elastic shear beam based on constrained synergistic action. The results show that the coefficient of foundation bed is small. The small stiffness of the whole building can better adapt to the disturbance of shield construction; For the buildings with larger overall stiffness, the shield construction has a more obvious effect on the internal force of the structure, while the influence on the inclination of the building is relatively small. 4. The influence of shield construction on adjacent pile foundation is analyzed by using two-stage method. It is found that the additional internal force of adjacent pile foundation is sensitive to the response of pile tunneling spacing. According to the relationship between the additional internal force of pile foundation and the distance between pile and tunnel, the soil around the tunnel is divided into strong influence area, weak influence zone and unaffected area, and the dividing standard is given. The microcosmic mechanism of foaming agent modified residue and the influencing factors of foam half-life were analyzed, and the results were successfully applied to solve the problems in this paper. The practice shows that when the foam agent is used to improve the mudstone with low water content, if the blade head is short of water spray, the residual soil will be block and slip when it is transported, and the speed of shield tunneling will be slow; The residual soil flow plasticity is improved and the speed of shield tunneling is improved obviously.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43
【參考文獻】
相關期刊論文 前10條
1 張乾青;李術才;李利平;陳云娟;;考慮側阻軟化和端阻硬化的群樁沉降簡化算法[J];巖石力學與工程學報;2013年03期
2 姜厚停;龔秋明;杜修力;;卵石地層土壓平衡盾構施工土體改良試驗研究[J];巖土工程學報;2013年02期
3 林存剛;張忠苗;吳世明;李宗梁;劉冠水;;軟土地層盾構隧道施工引起的地面隆陷研究[J];巖石力學與工程學報;2011年12期
4 李志明;廖少明;戴志仁;;盾構同步注漿填充機理及壓力分布研究[J];巖土工程學報;2010年11期
5 馬連叢;;富水砂卵石地層盾構施工渣土改良研究[J];隧道建設;2010年04期
6 李文舉;武亞軍;常瑩;;隧道盾構施工對臨近樁基影響的數(shù)值模擬[J];上海大學學報(自然科學版);2010年02期
7 賀美德;劉軍;樂貴平;王夢恕;張頂立;;盾構隧道近距離側穿高層建筑的影響研究[J];巖石力學與工程學報;2010年03期
8 王洪新;;土壓平衡盾構刀盤擠土效應及刀盤開口率對盾構正面接觸壓力影響[J];土木工程學報;2009年07期
9 姜忻良;崔奕;趙保建;;盾構隧道施工對鄰近建筑物的影響[J];天津大學學報;2008年06期
10 夏元友;張亮亮;王克金;;地鐵盾構穿越建筑物施工位移的數(shù)值分析[J];巖土力學;2008年05期
相關會議論文 前1條
1 朱偉;張明晶;張志允;;土壓平衡盾構氣泡發(fā)泡劑的試驗研究[A];中國土木工程學會第九屆土力學及巖土工程學術會議論文集（下冊）[C];2003年
相關博士學位論文 前1條
1 韓煊;隧道施工引起地層位移及建筑物變形預測的實用方法研究[D];西安理工大學;2007年
相關碩士學位論文 前4條
1 王為樂;長沙地鐵復合地層盾構選型與掘進參數(shù)研究[D];中南大學;2012年
2 郭濤;盾構用發(fā)泡劑性能評價方法研究[D];河海大學;2005年
3 白中仁;廣州地鐵三號線客大盾構區(qū)間盾構機選型技術[D];西南交通大學;2003年
4 張成;地鐵工程土壓平衡式盾構施工技術研究[D];西南交通大學;2002年
，本文編號：2347167
本文鏈接：http://www.lk138.cn/kejilunwen/daoluqiaoliang/2347167.html
