南京地铁复合地层盾构穿越建筑物及河流关键参数研究

发布时间：2018-06-13 17:41

本文选题：复合地层 + 盾构施工　；参考：《南京林业大学》2014年硕士论文

【摘要】：盾构施工技术在重大地下工程中的应用日益广泛，已成为我国地铁隧道建设的主要方法。随着全国各大城市大规模投入地铁隧道建设，地质条件差异性这一问题越发突出，对盾构施工技术提出了更高的要求：盾构在复合地层中掘进参数选取、盾构掘进对建（构）筑物影响、盾构穿越河流参数选取及防范措施等。本文以南京地铁三号线TA-14标宏~胜区间为背景，通过资料调研、理论分析、公式推导、实测研究及数值模拟的综合研究方法，对南京地区复合地层条件下盾构掘进参数及盾构穿越建（构）筑物、河流影响进行分析研究。主要研究成果如下：（1）根据盾构施工参数理论计算公式，针对复合地层条件下盾构推进的情况，推导出了盾构在复合地层中推进所需的推力及扭矩计算公式。（2）在理论基础上选取合适的土仓压力能有效控制开挖面稳定性及盾构前方土体沉降；适当增大土仓压力能减小盾构开挖对土体损失的影响。（3）在复合地层中，控制盾构机姿态调整角度大小在5mm/m以内，同时设定注浆量为理论值的140%~175%，以提高注浆效果，，减小地层变形。（4）根据数值模拟及公式推导得出复合地层沉降槽计算公式，并得出在复合地层中沉降槽半宽为3.5i。（5）盾构隧道开挖对嵌岩桩基影响较小，桩基在隧道轴线位置弯曲最大，最大值达3.15mm，可通过减小盾构推力，降低推进速度来控制桩基变形。（6）盾构穿越河流主要考虑开挖面稳定性及隧道上浮两方面。严格控制土仓压力，保证出土量为理论值的96%；减小注浆压力，提高注浆量为理论值的140%~180%；控制盾构掘进姿态，减少纠偏次数。
[Abstract]:Shield construction technology has been widely used in major underground projects and has become the main method of subway tunnel construction in China. With the large-scale construction of subway tunnels in major cities in the country, the problem of the difference of geological conditions is becoming more and more serious, which puts forward higher requirements for shield construction technology: the selection of tunneling parameters in composite strata, The influence of shield tunneling on the building, the selection of parameters of shield tunneling through river and the preventive measures, etc. In this paper, based on the background of TA-14 tagged Hongsheng section of Nanjing Metro Line 3, the comprehensive research methods of data investigation, theoretical analysis, formula derivation, field measurement and numerical simulation are used. The parameters of shield tunneling and the influence of shield tunneling through building and river in Nanjing area are analyzed. The main research results are as follows: (1) according to the theoretical calculation formula of shield construction parameters, aiming at the situation of shield driving under the condition of composite stratum, The formulas for calculating the thrust and torque required for shield tunneling in composite strata are derived. 2) on the basis of theory, the stability of excavating surface and the settlement of soil in front of shield can be effectively controlled by selecting appropriate pressure of earth bunker. Properly increasing the pressure of soil silo can reduce the influence of shield excavation on soil loss. In composite strata, the angle of attitude adjustment of shield machine should be controlled within 5mm/m, and the grouting quantity should be set at 140% 175 in order to improve the grouting effect. According to the numerical simulation and formula derivation, the calculation formula of settlement trough in composite stratum is obtained, and it is concluded that the half width of settlement trough is 3.5i. in composite stratum, the excavation of shield tunnel has little influence on rock-socketed pile foundation. The maximum value of pile foundation bending in the tunnel axis is 3.15mm. The deformation of pile foundation can be controlled by reducing shield thrust and driving speed. Strictly control the pressure of soil bunker to ensure that the unearthed quantity is 96 of the theoretical value; reduce the grouting pressure and increase the grouting volume to the theoretical value of 140 ~ 180; control the heading posture of shield machine and reduce the number of deviation correction.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U231.3

【参考文献】