JTG/T 3660-2020
Technical Specifications for Construction of Highway Tunnels (English Version)

Standard No.

JTG/T 3660-2020

Language

Chinese, Available in English version

Release Date

2020

Published By

Professional Standard - Traffic

Latest

JTG/T 3660-2020

Introduction

Key points of the revision of the specification

Revision dimensions	2009 version	2020 version	Technical significance
Structural system	Separation of specifications and detailed rules	Integration of two specifications + monitoring specifications	Unified construction control standards and process requirements
Mechanized construction	Not emphasized	Added a special section on mechanical excavation	Promote the transformation and upgrading of construction methods
Measurement technology	Traditional measurement methods	Add non-contact measurement	Improve monitoring efficiency and safety

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Key technological breakthroughs

1. Dynamic construction management system

Chapter 3 of the specification clearly requires the establishment of a closed-loop management mechanism of geological forecast → construction adjustment → measurement feedback, with special emphasis on:

• Advanced geological forecast is included in the process management
• Dynamic review system for surrounding rock grade
• Real-time application of monitoring measurement data

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2. Special geological response plan

Karst section construction case

Article 16.3 of the specification proposes a four-step treatment method of exploration-guidance-blocking-circumvention:

1. Use geological radar + advanced drilling rig for precise detection
2. Establish a drainage system to drain the underground river
3. Grouting to reinforce the broken zone
4. Set up arches to pass through large caves

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Implementation suggestions

Main points for mechanized matching

According to Article 3.0.3, the following configuration is recommended:

• Excavation: Three-arm drilling rig
• Support: wet spraying manipulator
• Lining: Hydraulic formwork trolley
• Monitoring: Total station robot

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Key points of quality control

Process	Control index	Specification clause
Sprayed concrete	Thickness ≥ design value, strength ≥25MPa	9.2/9.10
Waterproof layer	Joint strength ≥80% of parent material	11.4

JTG/T 3660-2020 Referenced Document

• GA 838-2009 Safety code for miniature civil explosives magazine
• GB 26859-2011 Safety code of electric power indusrty.Part of electric lines
• GB 26860-2011 Safety code of electric power indusrty.Electric part of power plants and transformer substations
• GB 50086-2015 Technical code for engineering of ground anchorages and shotcrete support
• GB 50108-2008 Technical code for waterproofing of underground works
• GB 50119-2013 Code for concrete admixture application
• GB 50194-2014 Code for safety of power supply and consumption for construction site
• GB 50268-2008 Code for construction and acceptance of water and sewerage pipeline works
• GB 8076-2008 Concrete admixtures
• GB 8958-2006 Safety regulation for working under hazardous condition of the oxygen deficiency
• GB/T 13869-2017 General guide for safety of electric user
• GB/T 1596-2017 Fly ash used for cement and concrete
• GB/T 50146-2014 Technical code for application of fly ash concrete
• GBZ 159-2004 Specifications of air sampling for hazardous substances monitoring in the workplace
• GBZ 2.1-2019 Occupational exposure limits for hazardous agents in the workplace — Part 1: Chemical hazardous agents
• GBZ 2.2-2007 Occupational exposure limits for hazardous agents in the workplace part 2:physical agents
• JTG 3370.1-2018 Code for Design of Highway Tunnels Volume 1 Civil Engineering
• JTG C10-2007 Specifications for Highway Reconnaissance
• JTG D20-2017 Design Specification for Highway Alignment
• JTG E30-2005 Test Methods of Cement and Concrete for Highway Engineering
• JTG E42-2005 Test Methods of Aggregate for Highway Engineering
• JTG F40-2004 Technical Specifications for Construction of Highway Asphalt Pavements
• JTG F80/1-2017 Inspection and Evaluation Quality Standards for Highway Engineering.Section 1　Civil Engineering
• JTG F90-2015 Safety Technical Specifications for Highway Engineering Construction
• JTG/T C10-2007 Guidelines for Highway Survey
• JTG/T F30-2014 Technical Guidelines for Construction of Highway Cement Concrete Pavements

JTG/T 3660-2020 history

• 2020 JTG/T 3660-2020 Technical Specifications for Construction of Highway Tunnels

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