EXPERIENCES IN THE CONSTRUCTION OF FEDERAL GERMAN TRUNK ROADS IN POOR SUBSOIL CONDITIONS

ERFAHRUNGEN BEIM BAU VON BUNDESFERNSTRASSEN AUF NICHTTRAGFAEHIGEM UNTERGRUND

THE CONSTRUCTION OF THE FEDERAL GERMAN MOTORWAY BETWEEN BREMEN AND KAMEN INCLUDED SOME SOIL EXCHANGE WORKS, DISPLACING SOIL WITH POOR BEARING CAPACITY (PEAT) WITH MINERAL SOIL. THE DEPTH WAS 6.5 METRES MAXIMUM AND WORK WAS CARRIED OUT ABOVE GROUND WATER LEVEL. DURING CONSTRUCTION OF THE FEDERAL GERMAN MOTORWAY BREMEN TO CUXHAVEN SOIL REPLACEMENT UP TO 14.0 METRES DEPTH WAS CARRIED OUT BY UNDERWATER EXCAVATION. THE PAPER GIVES INFORMATION ON EXPERIENCE GAINED FROM THESE CONTRACTS. OF PARTICULAR IMPORTANCE IS THE EVALUATION OF EXCAVATION DEPTHS BY THE CLIENT'S ENGINEER. THERE WAS ALSO A PROBLEM IN MAINTAINING SAFE DISTANCES TO STRUCTURES, ROADS AND RAILWAYS AND IN ESTABLISHING ACCESS TO THE SITES FOR HEAVY PLANT WITHOUT CAUSING DAMAGE. THE CONTRACTOR IS MADE AWARE OF THE CARE NECESSARY IN THE PREPARATION OF THE SITE, EVALUATION OF LAND REQUIREMENTS FOR EXCAVATING FILL MATERIAL AND CLARIFICATION OF THE GROUND WATER CONDITIONS. THE WORKS INVOLVED THE USE OF HEAVY EQUIPMENT FOR FLUSHING AND SUCTION PUMPING AND OF PARTICULAR IMPORTANCE WAS THE PLANNING OF THE WATER CONTROL MEASURES (DANGERS OF GROUND WATER LOWERING) AND THE CONSTRUCTION OF EMBANKMENTS FOR THE CONTROL OF FLUSHING WATER (EMBANKMENT FAILURES) IN ADDITION TO THE AVOIDANCE OR TREATMENT OF SOFT SPOTS (SETTLEMENT WITHIN THE EARTHWORKS). IN SPITE OF THE UNUSUAL CHARACTER OF THE WORKS WITH THE RISKS INVOLVED EARTH MOVING OF BOTH SUITABLE AND UNSUITABLE MATERIAL USING HYDRAULIC JETTING IS STILL THE MOST ECONOMICAL AND APPROPRIATE METHOD IN AREAS WITH POOR SUBSOIL CONDITIONS IF THE NECESSARY CARE IS GIVEN BY THE CLIENT AND CONTRACTOR.

Language

  • German

Media Info

  • Pagination: 10-4
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01293086
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 3:51AM