STUDY BY PHYSICAL MODELS OF THE ACTIVE EARTH PRESSURE FOR DIFFERENT METHODS OF DRIVING A VERTICAL SHAFT

ISSLEDOVANIE NA MODELYAKH PROYAVLENIJ GORNOGO DAVLENIYA PRI RAZLICHNYKH TEKHNOLOGICHESKIKH SKHEMAKH PROKHODKI VERTIKAL'NOGO STVOLA.

Scale model studies have been carried out with equivalent materials (mixture of sand and paraffin) to determine the stress-strain state of a homogeneous mass formed of fairly low-strength rocks encountered round a well, 1,000 M in depth, with various driving schemes. The first involved the placing into position of the support while driving, the second involving a shield and later positioning of the support. It is established that for the first type of driving not more than two-thirds of the deformation has occurred before the placing of the support in position, whilst in the second case, it is estimated that all the deformation has taken place. Thus, for the second case, the stresses in the support are twice less important. This is expressed by considerable deformations some 1.5 to 2 M wide around the shaft, and by the reduction of the tangential stresses over the same width with respect to their maximum value at 3 and 5 M away from the shaft. The coefficient of concentration of tangential stresses reaches a value of 2. The conclusion is in favour of the second method of driving. /TRRL/

• Authors:
  • Ogorodnikov, YUN
  • Samokhvalov, K K
  • Bokij, V B
  • Zimin, A A
• Publication Date: 1974

Language

• Russian

Media Info

• Features: Figures; References;
• Pagination: p. 37-40
• Serial:
  • Izvestiya Vuzov-Gornyj Zhurnal
  • Issue Number: 6

Subject/Index Terms

• TRT Terms: Decompression; Deformation; Deformation curve; Drilling; Driving; Earth pressure; Mathematical models; Paraffin; Physical distribution; Pressure; Rock mechanics; Sand; Shafts (Machinery); Shielding (Tunneling); Stresses; Structural analysis; Technology; Wells
• Uncontrolled Terms: Active earth pressure; Cavities; Models
• ITRD Terms: 5738: Cavity; 5768: Decompression; 5595: Deformation; 9016: Distribution (gen); 3871: Drilling; 6205: Model (not math); 5412: Pressure; 5757: Rock mechanics; 3394: Shield driving; 5575: Stress (in material); 5573: Stress analysis; 3855: Technology; 4386: Well
• Subject Areas: Bridges and other structures; Freight Transportation; Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00163154
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Feb 16 1978 12:00AM