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首页> 外文期刊>Computers and Geotechnics >Numerical analysis on post-grouted drilled shafts: A case study at the Brazo River Bridge, TX
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Numerical analysis on post-grouted drilled shafts: A case study at the Brazo River Bridge, TX

机译：后注浆井筒的数值分析：以德克萨斯州布拉索河大桥为例

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This paper investigates the effects of post-grouting on the behavior of drilled shafts using a case study carried out at the Brazo River, Texas. Commercial finite element software, PLAXIS, was used to quantify the improvement of the tip resistance and side shear resistance of post-grouted drilled shafts (PGDS). The input material parameters of PLAXIS were initially estimated using CPT sounding results, and then the parameters were updated by calibrating the numerical results against full-scale STATNAMIC load test results. Based on the numerical analysis, the authors concluded that (1) the increase in total resistance of PGDS resulted from soil improvement at the shaft tip, (2) the apparent increase in side shear resistance resulted from side shear reversal that occurred during post-grouting, and (3) the apparent increase in the tip resistance of PGDS may be caused by stress relief of the grout. In addition, two approaches to estimate the resistance of PGDS were compared against numerical results. In this case study, the Axial Capacity Multiplier (ACM) approach over-predicted the total resistance whereas the Tip Capacity Multiplier (TCM) approach reasonably predicted the increase in total resistance.
机译：本文以德克萨斯州布拉索河为例，研究了后灌浆对钻探井筒性能的影响。使用商业有限元软件PLAXIS来量化后注浆钻杆（PGDS）的抗尖端性和抗侧剪性。最初使用CPT探测结果估算PLAXIS的输入材料参数，然后通过将数值结果与满量程STATNAMIC负载测试结果进行校准来更新参数。基于数值分析，作者得出的结论是：（1）PGDS的总阻力增加归因于竖井尖端的土壤改良；（2）注浆过程中发生的侧向剪切逆转导致侧向抗剪力的明显增加（3）PGDS的端头阻力明显增加可能是由灌浆应力释放引起的。此外，将两种估计PGDS电阻的方法与数值结果进行了比较。在此案例研究中，轴向容量乘数（ACM）方法高估了总阻力，而尖端容量乘数（TCM）方法则合理地预测了总阻力的增加。

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