Geological investigation

Geological investigation services include:

  1. Field drilling
  2. Test samples in the laboratory
  3. Soil investigation report
  4. Prepare Soil investigation acceptance documents
  5. Handing over Soil investigation reports
  6. Set of competency certificates (5 types)

Geological investigation process sequence:

Field drilling: drilling, field SPT testing;

Sample testing: soil mechanical samples, triaxial samples, water samples,….

Prepare reports:   geological investigation report, cylinders, geological sections;

Acceptance documents: Minutes of acceptance and handover of documents;

Report handover: 5 sets of reports and practice certificate.

WHAT IS CONSTRUCTION GEOLOGICAL INVESTIGATION?

Construction geological investigation is the use of specialized drilling machines in geological investigation (XY-100, HT-150E drill,…) to drill deep into the ground to accurately determine the soil layers below.

During the drilling process, combined with soil sampling, for every 2 meters of drilling depth, a carefully packaged soil sample will be taken to bring to the laboratory for physical and mechanical properties of the soil. Soil mechanical testing in the laboratory is carried out according to Vietnamese standards (current TCVN), in addition, British standards (TCBS) and American standards (ASTM) can also be applied.

In addition, the drilling process also incorporates field SPT testing (Standard Penetration Test).

In some cases, the field testing process will include the following additional tests:

  • Wing want shear test in medium soft, soft and very soft clay.
  • Dynamic penetration testing combined with measuring CPTu pore water pressure
  • Experiment measuring soil resistance in boreholes

GEOLOGY PHUONG ANH

GEOLOGICAL INVESTIGATION DRILLING:

  • Drilling immediately after signung the contract
  • Samples were tested immediately upon returing to the laboratory
  • Complete documents for construction permit
  • Certificate of competency issued by construction minitry
  • Reissue lost documents for free

WHICH PROJECTS NEED GEOLOGICAL INVESTIGATION?

Construction geological investigation is carried out in the ground area of ​​the projects about to be built. The following projects require drilling for geological investigation:

Residential housing:

Civil housing (residential houses) with floor area > 250m2 or 3 floors or more – according to Circular No. 39/2009 TT-BXD, geological survey drilling is required before construction

Factory:

For factories in industrial zones, a geological survey report is required in the application for construction permit

Note: The investor must request permission from the Industrial Park Management Board before drilling for geological investigation

Depending on the regulations of each industrial park, the Factory Investor may have to pay an advance guarantee to the Industrial Park Management Board and will be paid back when the geological survey drilling unit completes the field work

High-rise buildings and apartments:

(required in the application for construction permit and data required for foundation design, there will be additional tests in addition to the 9 physical and mechanical criteria such as triaxial tests UU, CU, CD, compression tests a side expansion shaft, compression consolidation test, concrete corrosion water sample test)

School:

All school items must be drilled for geological investigation before construction, regardless of high-rise or low-rise buildings

Each school unit needs to drill 3 boreholes, the depth of each borehole is from 20-40m depending on the geology of the school construction area

Hospital:

Classified by category of geological investigation drilling such as office area, medical examination and treatment area, emergency recovery area, post-operative high-rise building area, etc.

For each item, there will be at least 3 geological investigation boreholes, the depth depends on the number of floors of each item and the geology of the area

For low-rise areas (2-3 floors), you only need to drill about 20-30m deep, so that the field SPT index is > 15 at a depth of 5m

For high-rise areas (>5 floors), apply the same as drilling for high-frequency buildings

Traffic road:

Drilling geological investigation along existing roads that are about to be renovated or have not yet been formed, which can be fields or ponds, drilling depth ranges from 5m/hole to 30m/hole depending on the type of road and the density of vehicles on the road. , distance from 500m to 1,000m per borehole

There are also a number of other construction items that require geological survey drilling such as: Swimming pool, port, military warehouse, gymnasium, …

Geological investigation
Geological investigation
Geological investigation
Geological investigation
Geological investigation
Geological investigation