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Horizontal Directional Drilling

DeepEX – Shoring Design Software

Document Version: 1.0.1.1

Released: June 16, 2021

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Piping installation – Finite Element Analysis Options

riverExit pointEntry point

Reaming

process

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DEEP EXCAVATION LLC 1

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HORIZONTAL DIRECTIONAL DRILLING

INTRODUCTION: DEEPEX – SHORING DESIGN SOFTWARE

DeepEX is a powerful software program for the design and evaluation of earth retaining systems. It can perform full structural and geotechnical design of any common wall type and support system. Any model (2D sections, 3D Frames) can be created, analyzed and optimized in minutes. Results and check ratios can be displayed in tables and graphically in a comprehensive way. Analysis warnings and recommendations can lead to the most efficient model optimization. Available Wall Types: Soldier Piles, Secant/Tangent Piles, Sheet Piles, Box Sheet Piles, Concrete Diaphragms, Combined Sheet Piles (King Piles), Gravity Walls and more. Available Support Types: Ground Anchors (Tiebacks), Concrete Slabs, Steel Struts and Steel Rakers, Steel and Concrete Walers, Tiedowns, Tierods and more. Analysis Methods: Limit Equilibrium (LEM), Beam on Elastoplastic Foundations (Non-Linear Analysis with Elastoplastic Springs), Finite Element Analysis (FEM). Soil Pressures Methods (LEM): Active/Passive, FHWA Apparent, Peck 1969 Apparent, AASHTO-17 (Temp. Bridges), Custom Trapezoidal, WMATA, NYC DEP (Sewers), German EAB, Two-step Rectangular, At-Rest and more. Lateral Earth Coefficients: Rankine, Coulomb, Caquot-Kerisel, Lancelotta. Beam Analysis Methods (LEM): Blum’s, FHWA Simple Span, Simple Span with Negative Moments, CALTRANS, WMATA. Seismic Pressures Methods: Semirigid, Mononobe-Okabe, Wood, User-Defined. Water Pressures Methods: Hydrostatic, Simplified Flow, Full 2D Flownet Analysis. Soil Properties: User-Defined, Estimation Tools (Test Data), SPT and CPT logs. Structural Codes: ACI, AISC. ASD, LRFD, EUROCODES 2, 3 and 8, AS, CN and more. Geotechnical Codes: AASHTO LRFD, CALTRANS, EUROCODE 7, CN, DIN and more. Printed Reports: Reports Exported in PDF and Word, Sketches exported to DXF. Model Creation: Graphical (Interactive Interface), Model Wizard, Voice Commands. Model Optimization: Automatic Optimization Tools – Wall/Support Structural Sections, Tieback fixed lengths, Support Locations and more.

DeepEX Features and Capabilities

Design and evaluate any deep excavation system (2D Sections and 3D Frames) with different analysis methods:

- Limit Equilibrium Analysis - Non-Linear Analysis (Soil Springs) - Finite Element Analysis

Perform Structural and Geotechnical design of any wall type and support system in the same software package.

Projects Designed with DeepEX DeepEX is trusted by more than 2000 engineers and engineering firms worldwide and more than 10000 projects have been designed using the software.

DeepEX – Customize your version DeepEX implements a series of additional optional modules, that can be activated inside the software upon purchase, increasing the software capabilities.

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A. HDD example in DeepEX Software

The current example illustrates the settlement and borehole wall stability analysis of a pipeline installation project through the horizontal directional drilling method (HDD). The HDD procedure is illustrated in the following figure.

Figure: analysis stages of pipe installation with horizontal directional drilling The simulation of the overall borehole is accomplished by selecting several crucial sections along the borehole length and performing a plain strain analysis for each individual section with DeepEX. For the specific example, a single section is selected, located at the half length of the borehole.

Figure: Selected Borehole Section


Drilling head


Reaming

process

riverExit point

Entry point

Pipe pullback

process







B. Stages

The 2D simulation of the selected section is accomplished in 4 different stages. The first stage corresponds to the initial conditions of the site prior to the initiation of any construction. The 2nd corresponds to the drilling of the pilot hole. The drilling fluid pressure is imposed as a prescribed pressure on the circumference of the pilot hole while the soil within the hole is deactivated. The user can also provide a partial deactivation of the soil within the hole based on an expected soil loss if 3 D effects need to be considered. The 3rd stage corresponds to the reaming process where the soil within the final hall is deactivated and again drilling fluid pressure is imposed as a prescribed pressure on the circumference of the hole. On the final stage, the prescribed pressure is deactivated, and the pipe section is activated.

Figure: Analysis Stages

Stage 1 - Initial greenfield conditions:

Application of Ko conditions.

Stage 2 – pilot hole drilling :

Deactivation of soil within pilot hole. Application

of mud pressure along the hole walls.

Stage 3 –reaming process:

Deactivation of soil within final hole. Application

of mud pressure along the hole walls.

Stage 4 – pullback process:

Activation of pipe and deactivation of mud

pressure.







C. Results

The DeepEX software has numerous options regarding post processing. For the specific example, surface settlement, displacement of the overall soil domain and the yield zone around the bore holes are illustrated in the following figures.

Figure: Surface settlement a) pilot hole b) final hole

Figure: Yield zone indicated with red circle markers (MC criterion) a) pilot hole b) final hole







Figure: Uz displacement of soil domain – 2nd stage

Figure: Uz displacement of soil domain – 4th stage







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