1.0.1 This Specification is formulated with a view to improve the technical levels for construction of highway subgrade engineering and to ensure the construction quality.
1.0.2 This Specification is applicable to the construction of newly-built and renovated (extended) subgrade engineering.
1.0.3 The highway subgrade shall meet the strength, stability and durability required by the design.
1.0.4 The construction of highway subgrade must abide by the laws and regulations on national safety production, so as to establish technical safety measures, to promote safety management, to strictly implement the safe operation specification, and therefore, to ensure the safety construction.
1.0.5 The construction of highway subgrade must abide by the laws and regulations of national occupational healthy safety, so as to sound the employees' healthy safety control system and ameliorate the safety conditions of occupational health.
1.0.6 The construction of highway subgrade must abide by relevant laws and regulations on national ecology, environmental protection and land management, so as to protect the geomorphy of the existing vegetation and prevent noise and dust nuisance. Moreover, the construction wastes must be carefully disposed.
1.0.7 The construction of highway subgrade must abide by the laws and regulations on protection of national historical relics; once meeting the cultural relics, the construction shall be ceased immediately, and the site must be well protected and shall be treated carefully together with the organizations all concerned.
1.0.8 Construction management plan shall be prepared before the construction of the highway subgrade.
1.0.9 As for the construction of highway subgrade, new technology, new process, new material and new facilities are encouraged to be adopted while meeting the quality standard.
1.0.10 The subgrade in special road segments should be dynamically constructed.
1.0.11 Not only the requirements stipulated in this Specification, but also those in the current relevant ones of the nation shall be complied with in the construction of highway subgrade.
Contents
1. General provisions
2. Terminologies and symbols
2.1 Terminologies
2.2 Symbols
3. Preparation of construction
3.1 General rules
3.2 Measurement
3.3 Test
3.4 Site clearing
3.5 Test pavement section
4. General subgrade construction
4.1 General rules
4.2 Embankment construction
4.3 Excavation subgrade construction
4.4 Construction of light filler embankment
4.5 Widening of the subgrade
5. Subgrade drainage
5.1 General rules
5.2 Surface drainage
5.3 Underground drainage
5.4 Engineering quality standard of subgrade drainage
6. Special subgrade construction
6.1 General rules
6.2 Construction of wet clay subgrade
6.3 Construction of soft ground subgrade
6.4 Subgrade construction in red-clay region
6.5 Subgrade construction in expansive soil region
6.6 Subgrade construction in loess region
6.7 Subgrade construction in saline soil region
6.8 Subgrade construction in eolian sand and desert regions
6.9 Subgrade Construction in Seasonal Frozen Soil Regions
6.10 Subgrade Construction in Permafrost Regions
6.11 Subgrade Construction along the Drift Ice Section
6.12 Subgrade Construction at Snow Damage Sections
6.13 Subgrade Construction at Landslide Section
6.14 Subgrade Construction at Dilapidation and Rock Stake Section
6.15 Subgrade Construction in Mudflow Region
6.16 Subgrade construction at karst regions
6.17 Subgrade construction at goaf
6.18 Subgrade construction at regions along rivers and brooks
6.19 Subgrade construction at regions with reservoirs
6.20 Subgrade construction at offshore regions
7. Subgrade construction of winter and rainy season
7.1 General rules
7.2 Winter construction
7.3 Rainy season construction
8. Subgrade protection or supporting and retaining
8.1 General rules
8.2 Slope protection
8.3 Protection of subgrade along the river
8.4 Retaining wall
8.5 Side slope anchoring protection
8.6 Brad support
8.7 Friction stake
9. Subgrade Safe Construction and Environmental Protection
9.1 General Rule
9.2 Safe Construction
10. Subgrade Renovation and Handover Acceptance
10.1 Subgrade Renovation
10.2 Handover Acceptance
Annex A Explanation of Wording in this Specification
