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Online Slope Stability, Soil Nailing, and Inclinometer Monitoring Workshop

4 hours each day, 8 PDH

Slope stability, soil nailing, and inclinometer worksho

July 15, 16, 2020

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Data, databases, and Machine Learning for Geotechnical Engineers

Data, databases, and machine learning for civil engineers

Aug, Sep, Oct 2020

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Online Deep Excavation and Soil nail wall design Workshop

16 PDH

Apr. 22,23, 29, 30, 2020

Deep excavation in Las Vegas

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DeepEX 2020

Solving Deep Excavation Design

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Deep Foundation Software, Pile Rafts, Pile Groups

From soil estimation to axial and lateral pile capacity

DeepFND - Deep Foundation Software, caissons, CFA, drilled piles, driven piles, concrete, timber

From soil estimation to helical pile settlement estimation.

New helical pile software HelixPile
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DeepFND 2020: Deep Foundation software (NEW: Pile-Group/Pile Raft Analysis!)
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Soldier and Tremied Concrete
Soil Mix walls
Combined king pile sheet piles
Slope stability
Cost estimation for braced excavations
Waler-Strut Cofferdams
Snail-Plus 2019: Soil nailing - soil nailing walls
SiteMaster: Inclinometer software (adopted by Geokon)
HelixPile: Helical Pile Software
RC-Solver: Concrete Design ACI-318, EC2, EC8
Steel-Beam: Steel beam column design, full equations, AISC, EC3

Measured vs. Theoretical Ground Anchor Loads for a 21.2m Deep Excavation in Santiago, Chile

Occasionally we get a chance to compare measured deep excavation performance against different methods. This 21.2m deep excavation case history in Santiago, Chile compares various conventional methods against measured ground anchor loads.

The excavation was constructed in competent cohesive gravels and was supported by two levels of ground anchors and 0.8m diameter reinforced concrete piles spaced at 3.2m. Reported displacements were under 2.0 cm. A 2m pile embedment below the final excavation subgrade was provided.

Various popular methods of conventional analysis were examined. In all cases wall to soil interface friction was ignored.

Most conventional methods produced reasonable agreement and came within 10% of the maximum measured loads. The PECK methods with the tributary height approach underpredicted reactions by as much as 25%. The CALTRANS approach with FHWA pressures overpredicted the upper ground anchor load by 17% and underpredicted the lower ground anchor load by 20%. The method producing the closest match was the German EAB approach which came in remarkably close.

The approach of using 50% of active and 50% of at-rest earth pressures severely overpredicted support reactions vs. the actual measured loads.

A critical aspect in case histories like this is the actual applied ground anchor prestress. In this project, the applied prestresses were in closer agreement to the German EAB approach. Should prestress levels had been applied in consistency with CALTRANS loads, measured ground anchor reactions could have been different.

With all due respect to German engineering, this case history clearly demonstrates the importance of evaluating different deep excavation analysis methods.

Deep excavation model in Santiago Chile

Measured vs theoretical tieback loads deep excavation Santiago Chile

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DeepEX

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Design deep excavations, stepped walls, piles, sheet pile design, non-linear analysis, secant pile walls, slurry walls, AASHTO,  ACI, AISC, Eurocode 2,3,7,8, British BS standards, + DIN! DeepEX is the software of choice for more than 1200 engineers worldwide.