水下盾構隧道的合理覆土厚度數(shù)值模擬分析
發(fā)布時間：2019-05-11 18:40
【摘要】：針對水下隧道長期賦存于富水環(huán)境中,圍巖的力學性質較差,地層的成拱能力降低的特點,研究水下盾構隧道的合理覆土厚度,為設計與施工提供參考。在國內外學者研究成果的基礎上,依托具體的工程實例,鑒于實際施工中盾尾管片壁后注漿對盾構隧道的動態(tài)上浮作用和對地層沉降的影響,進而確定對盾構隧道最小覆土厚度的影響,同時基于水下隧道突水風險研究,綜合考慮水、土、注漿漿液的動態(tài)影響,通過對顆粒流數(shù)值模擬結果進行分析,給出水下盾構隧道合理覆土厚度和最小覆土厚度臨界值的判定依據(jù)和條件,采取必要的信息化施工和響應聯(lián)動措施,控制水下盾構隧道淺覆土穿越水體地層變位,保證工程和環(huán)境的安全。研究結果表明:雙洞隧道的地表沉降曲線基本符合Peck沉降槽理論,隨著埋深的增加,地表沉降將由2個獨立的沉降槽逐漸發(fā)展疊加為1個新的沉降槽;對于依托工程而言,隧道覆土厚度的臨界值為1.3D;圍巖的豎向位移隨距隧道中心線距離的增大而減小,當距離增大到0.5D后位移變化不再顯著;隧道開挖后,由于隧道頂部土體拱效應的發(fā)揮,不同埋深情況下作用在管片上的土壓力將明顯小于初始土壓力,且壓力值與埋深成正比。
[Abstract]:In view of the fact that the underwater tunnel exists in the water-rich environment for a long time, the mechanical properties of the surrounding rock are poor and the arch forming ability of the strata is reduced, the reasonable overlying soil thickness of the underwater shield tunnel is studied, which provides a reference for the design and construction of the underwater shield tunnel. On the basis of the research results of scholars at home and abroad, relying on specific engineering examples, in view of the dynamic floating effect of shield tail pipe wall grouting on shield tunnel and the influence on formation settlement in actual construction, Then the influence on the minimum overlying soil thickness of shield tunnel is determined. at the same time, based on the study of water inrush risk of underwater tunnel, the dynamic influence of water, soil and grouting slurry is considered comprehensively, and the numerical simulation results of particle flow are analyzed. The determination basis and conditions of the reasonable overlying soil thickness and the minimum overlying soil thickness of the underwater shield tunnel are given, and the necessary information construction and response linkage measures are taken to control the displacement of the shallow overlying soil of the underwater shield tunnel through the water layer. Ensure the safety of engineering and environment. The results show that the surface subsidence curve of the double-hole tunnel basically accords with the Peck subsidence trough theory. With the increase of the buried depth, the surface subsidence will be gradually developed and superimposed from two independent subsidence grooves to a new settlement trough. For the relying project, the critical value of tunnel overlying soil thickness is 1.3D, and the vertical displacement of surrounding rock decreases with the increase of the distance from the center line of the tunnel, and the displacement changes no longer significant when the distance increases to 0.5D. After tunnel excavation, due to the arch effect of soil at the top of the tunnel, the earth pressure acting on the segment under different buried depths will be obviously smaller than the initial earth pressure, and the pressure value will be proportional to the buried depth.
【作者單位】： 清華大學土木工程安全與耐久教育部重點實驗室;北京交通大學城市地下工程教育部重點實驗室;北京市政建設集團有限責任公司;北京市市政四建設工程有限責任公司;
【基金】：國家重大研發(fā)計劃項目(2017YFC0805008)
【分類號】：U455.43;U459.5
本文編號：2474756
[Abstract]:In view of the fact that the underwater tunnel exists in the water-rich environment for a long time, the mechanical properties of the surrounding rock are poor and the arch forming ability of the strata is reduced, the reasonable overlying soil thickness of the underwater shield tunnel is studied, which provides a reference for the design and construction of the underwater shield tunnel. On the basis of the research results of scholars at home and abroad, relying on specific engineering examples, in view of the dynamic floating effect of shield tail pipe wall grouting on shield tunnel and the influence on formation settlement in actual construction, Then the influence on the minimum overlying soil thickness of shield tunnel is determined. at the same time, based on the study of water inrush risk of underwater tunnel, the dynamic influence of water, soil and grouting slurry is considered comprehensively, and the numerical simulation results of particle flow are analyzed. The determination basis and conditions of the reasonable overlying soil thickness and the minimum overlying soil thickness of the underwater shield tunnel are given, and the necessary information construction and response linkage measures are taken to control the displacement of the shallow overlying soil of the underwater shield tunnel through the water layer. Ensure the safety of engineering and environment. The results show that the surface subsidence curve of the double-hole tunnel basically accords with the Peck subsidence trough theory. With the increase of the buried depth, the surface subsidence will be gradually developed and superimposed from two independent subsidence grooves to a new settlement trough. For the relying project, the critical value of tunnel overlying soil thickness is 1.3D, and the vertical displacement of surrounding rock decreases with the increase of the distance from the center line of the tunnel, and the displacement changes no longer significant when the distance increases to 0.5D. After tunnel excavation, due to the arch effect of soil at the top of the tunnel, the earth pressure acting on the segment under different buried depths will be obviously smaller than the initial earth pressure, and the pressure value will be proportional to the buried depth.
【作者單位】： 清華大學土木工程安全與耐久教育部重點實驗室;北京交通大學城市地下工程教育部重點實驗室;北京市政建設集團有限責任公司;北京市市政四建設工程有限責任公司;
【基金】：國家重大研發(fā)計劃項目(2017YFC0805008)
【分類號】：U455.43;U459.5
【相似文獻】
相關期刊論文 前5條
1 高永濤;于詠妍;吳順川;;通車荷載下不同覆土厚度的地鐵隧道開挖對管線安全性的影響[J];巖石力學與工程學報;2013年S2期
2 熊啟東;胡俊強;何品祥;;水位和覆土厚度變化對不同形式過江隧道的影響研究[J];重慶建筑;2010年11期
3 熊啟東;胡俊強;李成芳;;水位和覆土厚度對不同形式過江隧道的影響[J];地下空間與工程學報;2010年S2期
4 施振東;;杭州地鐵越江盾構隧道沖刷線下覆土厚度的確定[J];都市快軌交通;2014年02期
5 李元松;李洋;段鑫;余順新;盧傲;;埋置式鋼波紋管設計方法的比較及分析[J];武漢工程大學學報;2014年05期
，本文編號：2474756
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2474756.html
