深圳大学学报理工版

结合城市地铁盾构法隧道工程实际,以盾尾同步注浆浆液环向填充过程为研究对象,选取环向任意一点建立注浆压力力学模型.假设浆液符合宾汉姆流体,应用流体力学与极限平衡法的基本原理,推导盾构壁后同步注浆环向填充压力分布统一计算模型,并将此模型推广到多孔注浆情形. 工程实例分析表明,推导的盾构同步注浆压力分布统一模型合理; 小径盾构隧道宜采用四孔注浆,大径盾构隧道宜采用六孔或多孔注浆方式; 注浆孔位置、盾尾间隙和截面流量对浆液压力分布有重要影响,应在盾构施工中予以重视.

This paper deals with the circumferential simultaneous grouting process by the tail of the tunnel boring machine(TBM)tail in practices of subway tunnels constructed by TBM. We establish the mechanical model of grout pressure at any point in the circumferential section, and derive the unified computation model of grout pressure distribution during circumferential filling by assuming that grouts are Bingham fluids. Then, using the basic principle of mechanical model and limit equilibrium method, we extend the computation model to multiple holes grouting. The grout pressure distribution model is verified by an engineering case. The analysis results indicate that four-holes grouting is suitable for smaller diameter tunnel, and six-holes grouting or multiple-holes grouting are good for larger diameter tunnel. Grouting hole position, TBM tail interspaces, and section flow have important impact on grout pressure distribution and thus deserve much attention in tunnel engineering.

引言
1 流体模型
2 同步注浆压力分布计算模型
3 工程实例分析
4 结论

图1 宾汉姆流体速度分布图<br/>Fig.1 Speed distribution of Bingham fluid

图1 宾汉姆流体速度分布图
Fig.1 Speed distribution of Bingham fluid

图2 浆液沿隧道环向充填过程<br/>Fig.2 Circumferential filling process of grout in shield tail interspace

图2 浆液沿隧道环向充填过程
Fig.2 Circumferential filling process of grout in shield tail interspace

图3 浆体向上流动受力简图<br/>Fig.3 Mechanical diagram of upward flow of grouting

图3 浆体向上流动受力简图
Fig.3 Mechanical diagram of upward flow of grouting

图4 浆体向下流动受力计算简图<br/>Fig.4 Mechanical diagram of downward flow of grouting

图4 浆体向下流动受力计算简图
Fig.4 Mechanical diagram of downward flow of grouting

表1 同步注浆压力分布计算模型<br/>Table 1 Computational model of pressure distribution for simultaneous grouting

表1 同步注浆压力分布计算模型
Table 1 Computational model of pressure distribution for simultaneous grouting

表2 盾构同步注浆主要计算参数[27]<br/>Table 2 Main calculation parameters of shield tunnel for simultaneous grouting[27]

表2 盾构同步注浆主要计算参数[27]
Table 2 Main calculation parameters of shield tunnel for simultaneous grouting[27]

表3 四孔注浆布设及注浆压力<br/>Table 3 Layout of four-hole grouting and grouting pressure of tunnel

表3 四孔注浆布设及注浆压力
Table 3 Layout of four-hole grouting and grouting pressure of tunnel

表4 六孔注浆布设及注浆压力<br/>Table 4 Layout of six-hole grouting and grouting pressure of tunnel

表4 六孔注浆布设及注浆压力
Table 4 Layout of six-hole grouting and grouting pressure of tunnel

表5 同步注浆压力分布计算结果<br/>Table 5 Calculated results of pressure distribution for simultaneous grouting

表5 同步注浆压力分布计算结果
Table 5 Calculated results of pressure distribution for simultaneous grouting

图5 浆液压力计算值与实测值对比<br/>Fig.5 (Color online)Comparison between calculated and measured values

图5 浆液压力计算值与实测值对比
Fig.5 (Color online)Comparison between calculated and measured values

表6 注浆孔位置<br/>Table 6 Grouting hole positions of shield tunnel

表6 注浆孔位置
Table 6 Grouting hole positions of shield tunnel

图6 不同注浆孔位置的浆液压力分布对比<br/>Fig.6 (Color online)Grouting pressure distribution under different grouting holes positions

图6 不同注浆孔位置的浆液压力分布对比
Fig.6 (Color online)Grouting pressure distribution under different grouting holes positions

表7 注浆孔位置对浆液压力分布的影响<br/>Table 7 Impact of grouting hole positions on grouting pressure distribution

表7 注浆孔位置对浆液压力分布的影响
Table 7 Impact of grouting hole positions on grouting pressure distribution

表8 盾尾间隙对浆液压力分布的影响<br/>Table 8 Impact of shield tail interspace on grouting pressure distribution

表8 盾尾间隙对浆液压力分布的影响
Table 8 Impact of shield tail interspace on grouting pressure distribution

图7 不同盾尾间隙的浆液压力分布对比<br/>Fig.7 (Color online)Grouting pressure distribution under different shield tail interspaces

图7 不同盾尾间隙的浆液压力分布对比
Fig.7 (Color online)Grouting pressure distribution under different shield tail interspaces

图8 不同截面流量的浆液压力分布对比<br/>Fig.8 (Color online)Grouting pressure distribution under different section flows

图8 不同截面流量的浆液压力分布对比
Fig.8 (Color online)Grouting pressure distribution under different section flows

表9 截面流量对浆液压力分布的影响<br/>Table 9 Impact of section flow on grouting pressure distribution

表9 截面流量对浆液压力分布的影响
Table 9 Impact of section flow on grouting pressure distribution

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备注

引言

1 流体模型

2 同步注浆压力分布计算模型

3 工程实例分析

4 结论

期刊信息

备注

引言

1 流体模型

2 同步注浆压力分布计算模型

3 工程实例分析

4 结 论

期刊信息

4 结论