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load-elongation curve according to gauge readings. This simple procedure is used to test each tieback for which a performance test is not conducted. Performance testing is a more reliable method of predicting the load-elongation behavior, and is conducted on a selected number of tiebacks in a project. For performance testing, a particular sequence of increasing and decreasing loads are applied, using equipment similar to those used in the proof test. Typically, the maximum load applied during the test will exceed the design load of the tieback system by approximately 20 to 30%. The creep behavior of the tieback system can also be studied according to the aforementioned procedure.
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The main purpose of an anchored wall system is to construct an internally stable mass of soil to resist external failure modes, while maintaining an acceptable level of serviceability. The constructed system should limit movement of the soil and the wall. The magnitude of total anchor force required
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is a structural element installed in soil or rock to transfer applied tensile load into the ground. Typically in the form of a horizontal wire or rod, or a helical anchor, a tieback is commonly used along with other retaining systems (e.g. soldier piles, sheet piles, secant and tangent walls) to
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Tiebacks are drilled into soil using a small diameter shaft, and usually installed at an angle of 15 to 45 degrees. They can be either drilled directly into a soldier pile, or through a wale installed between consecutive piles. Grouted tiebacks can be constructed as steel rods drilled through a
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Upon installation, tiebacks are tested and usually pre-loaded. In specific, a combination of proof tests and performance tests are performed on every job. Proof testing involves the application of successively larger loads on the tieback with a loading jack, allowing for the recording of a
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The bond length of the tieback must extend beyond the potential critical failure surface of the soil. Otherwise the tieback cannot provide resistance to the collapse of the ground mass enclosed within the failure surface.
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resistance, k is an empirical constant and T is the installation torque. These anchors are installed either for small loads in short sections or for larger loads and in long continuous lengths.
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is then pumped under pressure into the tieback anchor holes to increase soil resistance and thereby prevent tiebacks from pulling out, reducing the risk for wall destabilization.
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in the tieback can be determined by analyzing the soil and groundwater properties as well as sources of external loads applied to the system.
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with sufficient resistance. The tieback-deadman structure resists forces that would otherwise cause the wall to lean, as for example, when a
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required during installation. This relationship is in accordance with the equation Qt = kT where Qt is the total
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48:. With one end of the tieback secured to the wall, the other end is anchored to a stable
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is pushed seaward by water trapped on the landward side after a heavy rain.
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52:, such as a concrete deadman which has been driven into the ground or
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are screwed into place. Their capacity is proportional to the
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concrete wall out into the soil or bedrock on the other side.
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California
Department of Transportation tieback document
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Tiebacks in foundation engineering and construction
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44:provide additional stability to cantilevered
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142:"Ground Anchors and Anchored Systems"
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238:Offshore geotechnical engineering
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1351:Geotechnical shoring structures
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888:Mechanically stabilized earth
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640:Hydraulic conductivity tests
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1201:Stress distribution in soil
10:
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351:Pore pressure measurement
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1104:Preconsolidation pressure
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499:Standard penetration test
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600:California bearing ratio
398:Rotary-pressure sounding
229:Geotechnical engineering
162:Schnabel, Harry (1982).
27:Tiebacks to reinforce a
18:Tieback (disambiguation)
1020:Geosynthetic clay liner
995:Expanded clay aggregate
615:Proctor compaction test
556:Crosshole sonic logging
542:Nuclear densometer test
299:Geo-electrical sounding
1283:Earthquake engineering
1094:Lateral earth pressure
719:Hydraulic conductivity
570:Wave equation analysis
549:Exploration geophysics
441:Deformation monitoring
410:Rotary weight sounding
36:
461:Settlement recordings
386:Rock control drilling
287:Cone penetration test
86:Design considerations
26:
1323:Agricultural science
1025:Cellular confinement
16:For other uses, see
1215:Numerical analysis
1099:Overburden pressure
1089:Pore water pressure
869:Shoring structures
744:Reynolds' dilatancy
645:Water content tests
630:Triaxial shear test
590:Soil classification
563:Pile integrity test
54:anchored into earth
1190:Slab stabilisation
1170:Stability analysis
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1185:Sliding criterion
1147:Response spectrum
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893:Pressure grouting
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605:Direct shear test
311:Permeability test
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1197:Bearing capacity
1084:Effective stress
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975:Land reclamation
915:Land development
810:Natural features
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806:
774:Specific storage
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595:Atterberg limits
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434:Screw plate test
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149:www.fhwa.dot.gov
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990:Earth structure
985:Erosion control
883:Ground freezing
873:Retaining walls
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749:Angle of repose
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535:Visible bedrock
487:Simple sounding
475:Shear vane test
251:instrumentation
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72:Helical anchors
46:retaining walls
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1260:Related fields
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635:Oedometer test
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625:Sieve analysis
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511:Total sounding
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187:External links
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1288:Geomorphology
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1132:Consolidation
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1005:Geosynthetics
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724:Water content
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422:Sample series
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246:Investigation
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1308:Biogeography
1303:Hydrogeology
1293:Soil science
1273:Geochemistry
1032:Infiltration
960:Cut and fill
907:
903:Soil nailing
769:Permeability
734:Bulk density
451:Inclinometer
374:Ram sounding
259:
164:
157:
148:
102:
93:
89:
70:
62:
40:
38:
1318:Archaeology
1042:Foundations
1015:Geomembrane
898:Slurry wall
837:Water table
801:Interaction
797:Structures
784:Sensitivity
581:Laboratory
125:"Tie-backs"
33:Ground Zero
29:slurry wall
1175:Mitigation
1157:Shear wave
1142:Earthquake
1137:Compaction
1122:Permafrost
1113:Phenomena/
1010:Geotextile
935:Embankment
925:Excavation
862:Earthworks
822:Vegetation
817:Topography
739:Thixotropy
729:Void ratio
712:Properties
610:Hydrometer
355:Piezometer
275:Core drill
108:References
35:, New York
1298:Hydrology
1278:Petrology
1166:analysis
1164:Landslide
1069:Mechanics
980:Track bed
965:Fill dirt
950:Terracing
523:Trial pit
338:Statnamic
323:Load test
50:structure
1345:Category
1328:Agrology
1217:software
1115:problems
945:Causeway
920:Landfill
847:Subgrade
764:Porosity
759:Cohesion
1268:Geology
1240:SVSlope
1050:Shallow
970:Grading
908:Tieback
852:Subsoil
842:Bedrock
832:Topsoil
827:Terrain
620:R-value
583:testing
333:Dynamic
260:in situ
258:Field (
99:Testing
80:tensile
58:seawall
41:tieback
1250:Plaxis
1245:UTEXAS
1235:SVFlux
1225:SEEP2D
1077:Forces
930:Trench
878:Gabion
688:Gravel
328:Static
172:
76:torque
1230:STABL
703:Loess
666:Types
145:(PDF)
66:Grout
1055:Deep
698:Loam
693:Peat
683:Sand
678:Silt
673:Clay
658:Soil
360:Well
170:ISBN
940:Cut
249:and
31:at
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1199:*
168:.
147:.
133:^
116:^
39:A
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799:(
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221:e
214:t
207:v
178:.
151:.
127:.
20:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
