Back-filled grouting compaction model of shield tunnel based on spherical cavity expansion
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摘要: 为研究盾构隧道壁后注浆的压密效应, 假设压密阶段浆体在土体中呈半球形扩张。应用弹塑性理论对球形浆体的扩张过程进行了理论推导, 建立了盾构隧道壁后注浆压密模型, 计算了压密注浆体的扩张率、土体塑性区扩张率以及注浆对管片产生的压力, 分析了注浆压力和土体的弹性模量、粘聚力、内摩擦角等特性参数对管片压力荷载的影响。分析结果表明: 注浆对管片的压力随着注浆压力和土体泊松比的增大而增大, 随着土体弹性模量、粘聚力和内摩擦角的增大而减小; 注浆对单位面积管片产生的压力不随注浆压力和土体特性的改变而改变; 注浆对管片产生的压应力随着远离注浆孔而减小。Abstract: In order to study the compaction effect of back-filled grouting for shield tunnel, it was assumed that the grout expanded as a semi-sphere in clay stratum during compaction stage. The expansion process of spherical grouting was theoretically deduced by using elastic plastic theory, the back-filled grouting compaction model of shield tunnel was set up. The expansion rates of grouting, the plastic zone of soil mass and the pressure of grouting on segment were calculated. The effects of different parameters such as grouting pressure and the elasticity modulus, cohesive force and internal friction angle of surrounding soil on the pressure load of segment were analyzed. Analysis result shows that the pressure of grouting on segment increases with the increase of grouting pressure and soil mass Poisson's ratio, and decreases along with the increase of soil elastic modulus, cohesive force and internal friction angle. The pressure of grouting on unit area segment do not change along with the change of grouting pressure and soil characteristics. The pressure stress of back-filled grouting on segment becomes smaller and smaller when it is farther and farther away from grouting hole.
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Key words:
- tunnel engineering /
- shield /
- back-filled grouting /
- spherical cavity expansion /
- pressure distribution
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图 6 不同注浆压力条件下单位面积的注浆荷载
Figure 6. Unit area grouting loads under different grouting pressures
图 7 注浆荷载与土体特性的关系
Figure 7. Relationship between grouting loadsand soil characteristics
图 8 单位面积注浆荷载与土体特性的关系
Figure 8. Relationship between unit area grouting loads and soil characteristics
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