Vibro-replacement stone pile and rockfill reinforced earth and rockfill dam soft foundation treatment structure and construction method

Abstract

The invention provides a vibro-replacement stone pile and rockfill reinforced earth and rockfill dam soft foundation treatment structure and a construction method. The construction method comprises the steps that a vibro-replacement stone pile group is arranged on a soft covering layer to reinforce a deep soft foundation of a dam foundation; the bottom of the stone pile is located on a covering layer compact layer or weathered bed rock; an earth and rockfill dam anti-seepage system is composed of a covering layer foundation anti-seepage wall and a dam body anti-seepage body; a foundation inverted filter cushion layer is arranged at the top of the stone pile on the downstream side of the anti-seepage wall; and a dam shell rockfill body reinforced area is filled at the upper part of an upstream side stone pile and the upper part of a downstream side foundation inverted filter cushion layer of the anti-seepage wall, so that the deformation modulus of a dam material at the lower part of adam shell is improved, the settlement deformation of a dam body caused by a weak foundation is homogenized, and dam body cracking caused by differential settlement is avoided. For deep and thick weakfoundation conditions, through reasonable treatment measures and methods combining weak foundation reinforcement and dam body structure reinforcement, foundation strength, bearing capacity and deformation control meet the dam building requirement, and the important significance is achieved for an earth and rockfill dam engineering damming technology under complex conditions.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a soft foundation treatment structure and a construction method of an earth-rock dam reinforced with vibrating gravel piles and rockfill reinforcement. Background technique [0002] Constructing earth-rock dams on deep and weak foundations is an engineering technical problem often encountered in earth-rock dam projects. Often the weak foundation strength and bearing capacity cannot meet the stability and deformation requirements of the upper dam body under additional load conditions, and the dam cannot be directly built. However, measures must be taken to strengthen the foundation and structure of the dam body to ensure the stability and safety of the dam. For weak foundations, there are many treatment methods in engineering, such as direct excavation, preloading consolidation drainage, consolidation grouting, dynamic compaction, vibratory rei...

AI Technical Summary

Problems solved by technology

[0002] Constructing earth-rock dams on deep and weak foundations is an engineering technical problem often encountered in earth-rock dam projects. Often the weak foundation strength and bearing capacity cannot meet the stability and deformation requirements of the upper dam body under additional load conditions, and the dam cannot be directly built. However, measures must be taken to strengthen the foundation and dam structure to ensure the stability and safety of the dam

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