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GEOTECHNICAL SECTOR

BNB offers to know the behavior of earth materials. BNB engineer examine the soil and rock layers that make up the earth in order to determine their physical and chemical properties. Using this information, BNB design foundations and earthworks structures for buildings, roads, dams, embankments, cuts, foundations, retaining walls, anchors, tunnels and all other structures directly interacting with the subsoil, both onshore and offshore.

ON SHORE & OFF SHORE SOIL INVESTIGATION:

BNB provide services to obtain the following information of soil and rock.

  • Foundation type and depth.
  • Allowable bearing capacity for foundations.
  • Allowable passive resistance for foundations.
  • Floor slab design values.
  • Minimum steel reinforcing for foundations and slabs.
  • Estimated building settlement.
  • Retaining wall design values.
  • Recommendations for site grading and fill compaction.
  • Groundwater and seepage recommendations.
  • Excavation shoring design values.
  • Pavement design values.
CORE DRILLING:

BNB offers the varied ranges of coring, BNB correlate the drilling work with help of its expert team of geologist to fulfill the need of client of petro physical and petrochemical analysis of Lime query, coal query or even if want to test the bearing capacity and strength of rock to establish a comprehensive datum for structure. BNB engaged with all core size barrels, shoes and tubes to achieve client satisfaction.

COLLECTION OF SOIL AND WATER SAMPLES:

BNB offers the collection of every type of soil and water sample of borehole and their preservation.

  • Coring by single/ double/triple tube core bailers in rock.
  • Collection of disturbed or undisturbed sample.
  • Collection of Water sample.
  • Preserved the samples properly for Laboratory test.
  • Collection of sample for Environmental Assessments & Environmental Impact Statements.
PERMEABILITY TEST:

Measure the rate of the flow of water through soil.
Perimeter drains around a building and infiltration through a dam or landfill structure.
Determine permeability, including constant-head and falling-head types.
Determine the ability of rock or soil to control water during construction.

STANDARD PENETRATION TEST & CONE PENETRATION TEST:

BNB help to identify the bearing capacity of soil and rock.

  • The standard penetration test (SPT) or Cone penetration test (CPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil.
  • Evolution of SPT/CPT.
  • Influence of ground conditions on penetration resistance.
  • SPT/CPT energy measurement.
    • Use of SPT results.
    • Profiling.
    • Soil classification.
    • Determination of geotechnical parameters.

Direct design uses.

ROOF DEFLECTION TEST:
  • BNB evaluate the static shear capacity of a typical segment of a framed diaphragm under simulated loading conditions.
  • Determine the stiffness of the construction and its connections.
PILE LOAD TEST:

BNB provides a pile tests according to the classified standards.

  • Pile integrity testing/Low strain Integrity testing
  • Dynamic Pile Testing
  • Static pile load test according to ASTM, BS and Chinese code.
    • Kenteledge Load test method
    • Reaction beam load test / Anchor pile load test method
    • Bi Directional Static Load Test
    • Lateral / Horizontal load test
    • Pull out load test
PILLING WORK:

BNB offers you the Construction of pilling & Installation of Osterberg cell (‘O’ cell)

  • On shore & off shore pilling.
  • Pilling for bridges, buildings, railway tracks & jetties etc.
  • Diameters of bored piles range from 0.6 meter to 2.0 m meters,
  • BNB able to construct pile with percussion, reverse rotary & straight rotary.
PLATE LOAD TEST:
  • Plate Load Test is a field test.
  • Determine the ultimate bearing capacity of soil.
  • Determine the maximum settlement under a given load.
  • Provides data for use in the evaluation and design of rigid and flexible-type airport and highway pavements.
PILE CAPPING:

A REINFORCED CONCRETE slab is cast over the tops of the pile or group of pile to form a single structural element.

INSTRUEMENTATION

BNB provides a variety of Geotechnical instruments and their installation that can be suitable for monitoring the safety and stability of a variety of CIVIL AND MINING STRUCTURES including DAMS, barrages, TUNNELS, FOUNDATIONS, MINE OPENINGS, PILES, etc.

INSTALLATION OF DATA ACQUISITION SYSTEM:

BNB offers the installation of Data Acquisition System to monitor the dams & barrages that includes components for data collection that is permanently installed, & programmed to operate without human intervention.

  • Automated collection of data.
  • Transmission of data to a remote site
  • Processing & Plotting of data

BNB systems can stand alone. Once programmed and powered, no human or computer interaction is required, although data are typically downloaded to a PC for further analysis. A telecommunications or hardwire link allows data to be monitored and graphed in your office rather than in the field. Data from a number of stations and from a number of applications can be monitored from a single laptop or desktop computer.

The low power drain typically allows our data acquisition systems to be powered by solar panels and batteries

INSTALLATION OF PIEZOMETER:

BNB Provide and installed every type of piezometer in dams, barrages, tunnels, railway tracks and foundations etc. Piezometers measure pore-water pressure and ground water levels, providing information essential to:

  • Understanding initial site conditions.
  • Determining safe rates for placement of fill
  • Predicting slope stability.
  • Designing for lateral earth pressures.
  • Evaluating the effectiveness of drainage schemes.
  • Checking the performance of containment systems.
INSTALLATION OF INCLINOMETER:

Provide and installed Inclinometer which is helpful to get following information:

  • Measurement of lateral earth movements which might occur in unstable slopes, landslides, dams and roadway embankments & landfills.
  • Measure the deflections in the wall of excavations, shafts, tunnels and in caissons pile and sheet pilling.
  • Measures differential settlement along the length of casing.
INSTALLATION OF TILTMETER:
  • Tiltmeter is designed to measure tilt in structures such as buildings, dams & embankments.
  • Measurements the related stability of slopes, open pits and the walls of excavations.
  • Measurements of any tilting or differential settlements along embankments, railway tracks, road tracks, pipelines, tunnels, etc.
  • Measure the horizontal deformation of retaining walls, sheet pilling etc.
INSTALLATION OF SOIL EXTENSOMETER:

Soil Extensometer is designed to be installed, in series, to measure horizontal strain and settlements in earth fill or rock fill DAMS.

INSTALLATION OF HIGH SENSITIVITY SETTLEMENT SYSTEM:
  • It consists of a series of vessels containing liquid level
  • Monitor the Differential settlement, or heave.
  • This system is particularly suitable for critical situations where high resolutions are required.
  • It will measure the Elevation changes of as little as ±0.02 mm is detectable.

INSTALLATION OF EARTH PRESSURE CELLS:
They are designed to measure total pressure in earth fills and EMBANKMENTS. A vibrating wire pressure transducer converts the pressure into an electrical signal which is transmitted to the readout location.

INSTALLATION OF PILE TIP PRESSURE CELL:
  • Pile Tip Pressure Cell is used to measure pile-tip loads in cast-in-place concrete piles (caissons).
  • This cell is manufactured to be close to the diameter of the pile
  • This cell is connected to the bottom of the reinforcement cage.

INSTALLATION OF LOAD CELLS:

  • Load Cell is made from an annulus of high-strength steel or aluminum, with electrical resistance strain gages in a Wheatstone bridge configuration.
  • The load cell is designed primarily for use on tiebacks and ROCKBOLTS
  • It will be used during PILE LOAD TESTS and for monitoring loads in cross lot struts and TUNNEL supports, etc.
  • The load cells are used in conjunction with a hydraulic jack and bearing plates.
INSTALLATION OF STRESSMETERS:
  • It can be installed in boreholes up to 100 feet deep.
  • It is used to measure compressive stress changes in rock, salt, concrete or ice.
  • The measurement of in situ stresses is important in the design of underground openings such as power houses, crushing stations, mines, tunnels and the like.
  • It is also useful for determining the inherent stability of pit SLOPES, FOUNDATION EXCAVATIONS, MINE pillars and DAM abutments.
INSTALLATION OF INSTANTEL:
  • It is manufactured a complete line of vibration and overpressure monitors.
  • Monitor for regulated vibration and overpressure control.

Monitors are currently used in various mining, construction, and geotechnical applications, which include: blasting in mining, quarrying and construction projects, pile driving, vibration studies, etc.

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