NB/T 10336-2019Code for engineering geological investigation of medium and small hydropower projects (English PDF)

1.0.1

In order to unify the geological survey of small and medium-sized hydropower projects, clarify the survey tasks, content, methods and technical requirements of each survey and design stage,

To ensure the quality of surveys, formulate this specification.

1.0.2

This code applies to engineering geological surveys of small and medium-sized hydropower projects.

1.0.3

The geological survey of small and medium-sized hydropower projects shall not only comply with this code, but also comply with the current relevant national standards.

2.0.1 engineering geological investigation of hydropower project

Engineering geological surveying and mapping, geophysical prospecting, drilling, tunneling, in-situ testing and laboratory for the investigation of the engineering geological conditions of hydropower engineering buildings

Comprehensive investigation and research work such as internal testing and long-term observation.

2.0.2 engineering geological conditions

The general term for engineering-related topography, landforms, stratum lithology, geological structure, hydrogeology, physical geological phenomena and other geological conditions.

2.0.3 engineering geological mapping

Through direct observation on the ground and other auxiliary means, the geological information related to the construction of the project is drawn on the topographic map at a certain scale,

And form the work of technical documents.

2.0.4 engineering geological evaluation

According to the obtained geological data, combined with the specific engineering characteristics, the engineering geological conditions and main engineering geological problems of the building area are analyzed.

Conduct analysis, research and calculations, draw relevant understandings and conclusions, and propose measures for the treatment and prevention of adverse geological phenomena.

2.0.5 Seepage of dam foundation

After the reservoir is impounded, the reservoir water leaks downstream along the river bed and the rock and soil mass of the dam foundations on both banks.

2.0.6 seepagearound the dam

After the reservoir is impounded, the reservoir water leaks downstream along the rock and soil mass outside the two ends of the dam crest.

2.0.7 Potential unstable rock and soil

The status quo is basically stable. In a certain period of time in the future, affected by various effects, rock and soil masses that may become unstable may occur.

2.0.8 Regional tectonic stability

The degree of comprehensive influence of regional geological structure, fault activity, seismic activity and seismic hazard on the stability and safety of the engineering site.

2.0.9 reservoir-induced earthquake

Under the special geological background, due to the impoundment of the reservoir, there are new occurrences in the reservoir and its vicinity, which are related to the local natural seismic activity.

Seismic activity with significantly different motion patterns.

2.0.10 karst reservoir

Karst areas use karst depressions, karst troughs, blind valleys, etc., or reservoirs formed by dams or caves in underground rivers.

2.0.11 Structural discontinuity

Discontinuous interfaces in the rock and soil bodies, such as bedding, faults, joints, and fissures.

2.0.12 Relaxed zone of rock mass

According to the degree of unloading of the rock mass or the depth of development, the rock zones are generally divided into strong unloading zones, weak unloading zones, and deep unloading zones.

2.0.13 surrounding rock mass

Around the underground cavern, the rock mass that has caused stress redistribution due to excavation, or the rock mass that may affect the stability and deformation of the cavern.

2.0.14 argillization interlayer

Affected by structural destruction or physical and chemical effects, its original structure, structure and mineral composition have undergone significant changes, and contain a large amount of mud

The weak interlayer.

2.0.15 engineering geological classification of rock masses

The standards and categories of rock mass engineering geological conditions are classified according to the structural characteristics and physical and mechanical properties of the rock mass.

2.0.16 weak plane

The structural surface whose mechanical strength is significantly lower than the strength of the surrounding rock.

2.0.17 Anti-sliding stability of dam foundation

The ability of the dam foundation rock and soil to resist the shear deformation and destruction of the dam body.

2.0.18 rock burst

Under the conditions of high ground stress, the stress in the surrounding rock of the excavated cavern is suddenly released, causing the dynamic phenomenon of rock bursting and ejection on the wall of the cave.

2.0.19 high pressure water test

An on-site water pressure test to determine the permeability characteristics, permeability stability and opening pressure of structural surfaces of rock masses under high water head. Its highest pressure

The force is 1.2 times or more of the working head of the building.

2.0.20 Earthquake-induced liquefaction

The phenomenon that the saturated non-cohesive soil and low-viscosity particles tend to be compacted by the earthquake, the pore water pressure increases, and the effective stress approaches zero.

2.0.21

Rock mass structure...