PyDWG - Drilling Pattern Generator

A Python package for generating drilling patterns for tunnel excavation based on AutoCAD polylines. This tool creates optimized drilling patterns for various tunnel shapes, supporting both circular and arbitrary polyline geometries.

Features

• Multi-format Input: Supports AutoCAD Lines, Arcs, and Polylines
• Flexible Geometry: Works with both circular and arbitrary tunnel shapes
• Four-Section Cut Pattern: Implements industry-standard four-section parallel cut patterns
• Automatic Pattern Generation:
  • Cut holes (central relief and cutting pattern)
  • Stoping holes (interior grid pattern)
  • Contour holes (perimeter smooth blasting)
• High-Fidelity Processing: Handles complex geometries with arc tessellation
• AutoCAD Integration: Direct drawing and layer management

Installation

pip install pydwg

Quick Start

Prerequisites

1. AutoCAD: Must be running and accessible
2. Python: 3.7 or higher
3. Dependencies: pyautocad, numpy

Basic Usage

1. Draw your tunnel outline in AutoCAD on a layer named 0_dbm_polyline
2. Run the generator:

from pydwg import FourSectionCutGenerator
from myAutoCAD import myAutoCAD

# Initialize
acad = myAutoCAD()
generator = FourSectionCutGenerator(acad)

# Read tunnel outline
tunnel_outline = generator.read_tunnel_outline_from_layer("0_dbm_polyline")

# Generate pattern
center, radius = generator.calculate_tunnel_center_and_radius(tunnel_outline)
advance_length = 3.5  # meters
hole_diameter = 0.045  # meters (45mm)

# Calculate parameters
df, dl, sections = generator.calculate_four_section_parameters(hole_diameter, advance_length)

# Generate all hole patterns
cut_holes = generator.generate_four_section_cut_pattern(center, sections, hole_diameter, dl)
stoping_holes = generator.generate_stoping_pattern(tunnel_outline, cut_holes, center, hole_diameter)
contour_holes = generator.generate_contour_holes(tunnel_outline, hole_diameter)

# Draw the pattern
all_holes = cut_holes + stoping_holes + contour_holes
generator.draw_drilling_pattern(all_holes, tunnel_outline)

Command Line Interface

pydwg

This will prompt you for:

• Advance length (default: 3.5m)
• Hole diameter (default: 45mm)

Advanced Features

Custom Pattern Types

The package supports different drilling pattern types:

• Four-Section Cut: Industry standard for tunnel excavation
• General Polyline: Works with any closed polyline shape
• Contour Holes: Smooth blasting along tunnel perimeter
• Stoping Holes: Interior grid pattern for bulk excavation

Geometry Processing

• Arc Tessellation: Converts AutoCAD arcs to high-fidelity vertex sequences
• Segment Ordering: Automatically orders disconnected segments into continuous paths
• Polygon Analysis: Calculates weighted centroids and areas
• Offset Operations: Creates parallel paths for contour holes

AutoCAD Integration

• Layer Management: Automatic layer creation and organization
• Entity Drawing: Circles, lines, and text annotations
• Color Coding: Different colors for different hole types
• Zoom and Save: Automatic view management and file saving

API Reference

Main Classes

FourSectionCutGenerator

The main class for generating drilling patterns.

Methods:

• read_tunnel_outline_from_layer(layer_name): Read geometry from AutoCAD layer
• calculate_tunnel_center_and_radius(vertices): Calculate weighted centroid and radius
• generate_four_section_cut_pattern(center, sections, hole_diameter, empty_hole_diameter): Generate cut pattern
• generate_stoping_pattern(tunnel_outline, cut_holes, center, hole_diameter): Generate stoping holes
• generate_contour_holes(tunnel_outline, hole_diameter): Generate contour holes
• draw_drilling_pattern(holes, tunnel_outline): Draw pattern in AutoCAD

Configuration

The package uses several configurable parameters:

• Contour offset: Distance from tunnel perimeter (default: 0.3m)
• Stoping spacing: Grid spacing for interior holes (default: 0.8m)
• Cut pattern: Four-section parameters based on advance length
• Hole diameters: Different sizes for different hole types

Examples

Circular Tunnel

# For circular tunnels, the pattern automatically adapts
# to the calculated radius and center

Irregular Tunnel

# For irregular shapes, the pattern follows the actual geometry
# with proper contour and stoping hole placement

Custom Parameters

# Customize pattern parameters
advance_length = 4.0  # meters
hole_diameter = 0.051  # meters (51mm)
contour_spacing = 0.35  # meters
stoping_burden = 0.9  # meters

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests
5. Submit a pull request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Citation

If you use this software in your research, please cite:

@software{pydwg,
  title={PyDWG - Drilling Pattern Generator},
  author={Your Name},
  year={2024},
  url={https://github.com/yourusername/pydwg}
}

Support

• Issues: GitHub Issues
• Documentation: GitHub Wiki
• Email: your.email@example.com

Changelog

Version 1.0.0

• Initial release
• Four-section cut pattern generation
• AutoCAD integration
• Support for arbitrary polyline geometries
• Arc tessellation and segment ordering