Recommendations on Excavations by Deutsche Gesellschaft für Geotechnik e.V. / German

By Deutsche Gesellschaft für Geotechnik e.V. / German Geotechnical Society

The purpose of those options is to harmonize and additional boost the equipment, in keeping with which excavations are designed, calculated and performed. in view that 1980, those were drawn up via the operating staff for excavations of the German Society for Geotechnics (Deutsche Gesellschaft f?r Geotechnik) lower than the identify EAB and are just like a collection of criteria. all of the major software program programmes in Germany are in line with those suggestions. The innovations assist in designing and calculating excavation structures, unifying methods to quite a bit and strategies of calculation. in view that they're in line with an licensed international safeguard suggestion, following those concepts guarantees the soundness and value of excavations and their person elements. additionally, they assist to enhance the profitability of excavation buildings. the result's a piece of significant significance for all specialists desirous about the making plans and calculation of excavations.

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In general cases, this follows from: eog= Y . K, (H + zp) However, once the excavation is complete, the limit value eph = epgh + epch of the passive earth pressure determined with & = 0 may apply in the region immediately below the excavation level, due to the reversal of the principal stresses as a result of unloading. The case epch= 0 is shown in Figure R 102-1. 4. The ground reaction below the intersection of eog and e p h in excess of the at-rest earth pressure may be adopted as a function of the local displacement sh as the soil stress Oh = ‘s,h ’ sh See also Figure R 102-1.

Suitable contact elements must be adopted to consider the component-ground interaction. See also R 4, Paragraph 2 for adopting the wall friction angle. 8. It must be demonstrated at all times that the limit value of the horizontal component of the passive earth pressure determined using 6 , # 0 is not completely utilised by the ground reaction R, resulting from the integration of the horizontal soil stresses o h in the embedment area of the wall. 50 Bh must be adhered to. For a free earth support, this may be based on the passive earth pressure E for parallel displacement as shown in Figure R 102-3a.

5 . The wall deformations associated with the removal of the highest row of struts andlor unloading of the highest row of anchors are usually sufficient to reduce the upwardly redistributed earth pressure to the classical active earth pressure. < After strut ai Support on the blinding concrete bi Support from the structure or backfill Figure R 68-1. 1 Determination of internal forces (R 11) 1. All advancing and retreating states for excavating and backfilling must be investigated. Advancing states refers to all construction stages until reaching the final excavation level; retreating states refers to all construction stages during backfilling of the excavation and during removal or repositioning of struts.

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