"Geodiagnostics" Ltd

Acoustic, elastic, deformation, strength properties and fracture porosity of materials of foundations of building and structures (soil, concrete, soil cement) are connected together, that allows to use acoustic methods when controlling quality of constructions, exploration and geotechnical works.

Technical means and technologies of impulse crosswell acoustic raying and probing of rock masses were developed by All-Russian Research and Development Institute of exploration methods in the end of 60s years of 20th century. MAP-1 (1974) and API-1 (1981) equipment were in serial production.

After Institute reorganization works on development of technical means and technologies of acoustic raying and probing were passed to Geodiagnostics Ltd. Currently there is developed computer-controlled hard-ware system of impulsive acoustic raying and probing APZ-1 include: radiation emitter and measuring system. Radiation system consists of current impulse generator, high-voltage cable and electric spark source. Measuring system of borehole receiver or vibration inverter, reinforcing agent and complex of PC-based software hardware. Borehole equipment is used jointly with logging truck hoist equipped by KG-3 type cable in hydro filled boreholes or shot holes with diameter 46 mm or more, depth to 150 mm and in distances between them 100 mm.

APZ-1 hardware system is intended to measure transmission time, amplitude and frequency of elastic waves impulse in rock mass between emitter and receiver with the purpose to determine environment elastic properties. APZ-1 hardware system is calibrated by Research and Development Institute of Metrology after Mendeleev (Certificate of measuring mean calibration № 2520-944 d.d. 11.04.06). Main APZ-1 measure percentage error: time +5%; vibratory acceleration +8%; oscillation frequency +2%.

Hardware system provides:

- monitoring of soil conditions and reconstructions of surface building foundations before and after influence on them by different reinforcement ways; monitoring of quality of soil bondability and cementation in mine roadways construction (holes, tunnels, inclined tunnels) and road foundations;

- determination of pore spaces existence and concrete slabs environment properties; monitoring of conditions tunnel lining and road surface, control of auger and precast piles and bridges concrete bearings;

- geological segmentation, detection and edging of blind ore bodies, quartz reefs, fracture zones, karsts, talik, buried ice, lower bound of incoherent mass and residual soil.

- Translucence distance of incoherent soils (sand, sandy clay) is no less than 20 m, on rocky soils (granites) reaches 150 m. Penetration depth in rocky soils and concrete is to 40 m. Resolution ability in soil acoustic raying is + 0,5 m, in rock mass and concrete raying is + 0,05 m.

Technology of search of ore bodies in crossholes by means acoustic raying is probated in period between 1970-1990 at tens of USSR deposits , including deposits of Kochbulak (Uzbekistan), Uzudmurt (Kazakhstan), Karamken (Russia). Use of acoustic raying provides detection of ore bodies in crossholes and underground space that allows to increase qaulity and correct of evaluation of deposits of mineral resources, decrease expenses at exploration due to decrease of number of exploration bores and excavations.

Technology of exploration of ice soil borders by means acoustic raying is designated for monitoring of ice soil borders before drivage. Main diagnostic characteristics of ice soil borders integrity conditions is speed longitudenal elastic waves in ice soils. Instructional guidelines on monitoring of ice soil borders integrity by crosshole acoustic raying when constructing tunnels in difficult hydro geological conditions published in Leningrad, 1981, are approved by Government of Glavtunnelstroy of USSR. First works on monitoring of ice soil borders were executed in 1974 at Outwash section of Kirovsk-Vyborg line of Leningrad underground (O. Andreev is works head). In 2001-2006 in St.Petersburg there executed integrity monitoring of ice soil borders of 12 separate shafts 214bis (Karbysheva street), 507 (Olhovaya street), 440 (Shamuana street), 17/2 (Konyushenny per) and others that provided accident-free shaft sinking.

Technology of investigation of soil cement borders by acoustic raying is intended for control of soil cement borders integrity made by method of jet cementation before drivage and construction. Main diagnostic character of soil cement borders integrity is speed longitudenal elastic waves of soil cement. In 2001-2006 in St. Petersburg there executed integrity monitoring of soil cement borders

of shafts 4 (Grazhdansky pr.) and 1 (Kushelevka) of relief sewer on Ploschad Muzhestva area, rig road tunnel in joint of Toksovskaya street (Murino), cells of 1 and 2 sections of construction of second stage of Mariinsky Theatre, troughing part of T4-C complex of St.Petersburg protective structures from inundations etc. ion the basis of data of acoustic raying of shafts 4 (Grazhdansky pr.) there was made a decision to conduct additional injection that would provide zone closing of discontinuity flow, and, finally, accident-freee shaft sinking.

Technology of investigation of auger piles and precast piles and bridges concrete by acoustic raying is intended for monitoring of pile properties: integrity, length, form, concrete strength class. Method essence is mechanical excitement of pile head by results of comparison of properties and echo-signal in constructional of diagnostic characteristics of piles different conditions. The technology was probated in 2002 in construction of laboratory building of St. Petersburg State Mining University (Nalichnaya street), bridges bearings, pile foundations of highways on ring road and West Speed Diameter.

Technology of investigation of soil cement piles of road foundations by acoustic raying and logging is intended for bearing properties monitoring: soil concrete integrity, length, diameter, strength. Methods essence if excitement of impulse of acoustic waves after pass in soil concrete and bearing state assessment on results of comparison of acoustic waves impulse with the table of diagnostic properties of bearing states. Soil concrete strength monitoring is executed on the basis of dependence acoustic waves - strength in linear compression. In 2004-2006 the technology was widely used in construction of road ring around St. Petersburg in sections LOT1 and LOT6.

Technology of investigation of condition of mining liner by probing is intended for monitoring liner condition and holes search under concrete slabs. Methods essence is point mechanical impulse excitement of surface of mining lining and defining of its condition by time, magnitude and frequency and phase properties of acoustic echo-signal. Technology was applied in 2003 in investigation of lining of tunnels 1 and 2 (Outwash section) between Lesnaya and Ploschad Muzhestva stations of St. Petersburg underground with the purpose to determine depth of protective reinforcing matrix layer and holes existence in tubed space.

Aleksey Arkhipov

Doctor of Technical Science, General Director of "Geodiagnostics"

196233, St^’Petersburg, Vitebskiy, 109

phone: 89111582796

Fax: (812) 727-45-91

E-mail: arhipov8@mail.ru

Internet: www.arhipov8.narod.ru

Используются технологии uCoz