Stress and Deformation Characteristics of Underreamed Anchor in a Deep Excavation in Coastal Soft Soils
To solve the technical difficulties in a deep excavation support in the coastal soft soils such as new backfill soils and silty soils,the underreamed anchor by the jet grouting or ordinary prestressed anchor and cast-in-place pile are used in a pro-ject.The problems such as borehole collapse and insufficient anchoring force of the anchor construction in coastal soft soils are effectively solved by adopting such technologies as drilling with pipe,simultaneous installation of the anchor cable and full-length grouting,thus ensuring the safety and stability of the deep excavation supporting structure.On this basis,the accept-ance test of the uplift capacity of the underreamed anchor by the jet grouting and ordinary anchor is performed.The acceptance test of the uplift capacity of anchor cable shows that the underreamed anchor by the jet grouting can provide enough uplift load in the coastal soft soils.Meanwhile,the result of the cable elongation value in the acceptance test less than the theoretical elon-gation value of the free section was discussed and analyzed,and improvement solutions were proposed.
Deep ExcavationUnderreamed Anchor by Get groutingCoastal Soft StratumAcceptance TestStress and De-formation Characteristics
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