Effect of Pile Foundation Grouting in Karst Area Based on 3D Numerical Simulation
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摘要: 为了研究改良膨胀性注浆材料的注浆效果，通过室内试验采集浆液结石体物理力学参数，应用有限元软件Midas GTS NX在CATIA所构筑的三维溶洞模型的基础上，结合修正莫尔–库仑模型及弹性本构关系，分析了桩基础下土层的应力与变形在空洞及改良前后不同浆液填充状态下的变化规律，以此为标准对注浆效果进行对比分析。研究表明：对桩基础下溶洞进行注浆充填加固可有效保障桩基础及桩基础下溶洞的稳定性，避免工程事故的发生，相比于普通水泥浆液，改良膨胀性注浆材料的整体强度明显改善，变形与应力均有所减小，结构更均匀，更密实。同时也表明，通过数值模拟分析确定溶洞的注浆效果具有一定的可行性和指导意义，可为工程的设计与施工提供参考。Abstract: To study the grouting effect of the modified expansive grouting material developed according to the actual engineering requirements, the slurry parameters were collected through material performance tests such as compressive strength, and applied in the finite element software Midas GTS NX, and based on the three-dimensional cave model constructed by CATIA. The change of stress and deformation of the soil layer under the pile foundation in different states of the cave and modified slurry filling before and after, and the grouting effect was compared and analyzed by this standard. The study showed that the grouting reinforcement of the cave under the pile foundation can effectively avoid the occurrence of engineering accidents, and the overall strength of the modified grouting material was significantly improved, the deformation settlement and stress were reduced, and the structure was more uniform and dense compared with the ordinary cement slurry, which also proves that the numerical simulation analysis has certain guiding significance to determine the grouting effect of the cave, and provides reference for the design and construction of the project.
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Key words:
- pile foundation /
- karst cave /
- grouting materials /
- numerical simulation /
- grouting effect
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表 5 地层及浆液材料参数表
地层及
材料层厚
/m弹性模量
/（kN·m−2）泊松比 重度
/（kN·m−3）黏聚力
/kPa内摩擦
角/（°）人工填土 1.0 2600 0.39 18 5 10 淤泥 2.0 1800 0.44 15 5 5 粉质黏土 7.5 18000 0.31 19.2 20 9 细砂 2.5 25000 0.28 18.6 1 30 微风化石灰岩 37.5 120000 0.2 26.8 4500 36 普通水泥浆液 28000000 0.2 16.8 改良浆液 30000000 0.2 14.4 
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