Consolidation grouting methods for riverbed rock mass coverings of complex dam foundations

LUO Guanjun; WANG Kexiang; GUO Zengguang; TAN Yaosheng; AWANG Jiacuo

doi:10.16511/j.cnki.qhdxxb.2020.26.010

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (7) : 575-581. DOI: 10.16511/j.cnki.qhdxxb.2020.26.010

SPECIAL SECTION: ROCK MECHANICS AND ENGINEERING PRATICE FOR LARGE HYDROPOWER STATIONS

Consolidation grouting methods for riverbed rock mass coverings of complex dam foundations

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Abstract

Effective surface rock grouting and effective coupling between the concrete-cover grouting and concrete construction are difficult problems, especially with complex geological conditions. This study analyzed the complex geological conditions of the Baihetan dam foundation to develop a consolidation grouting method using the reserved rock mass cover weight, a low pressure thick slurry seal and consolidation grouting by the cover weight by controlling various parameters including the reserved rock mass cover weight, the grouting pressure and concentration, and the grouting method and materials. This method not only avoids the problems of conventional consolidation grouting methods, but also protects the crane beach dam foundation thin layer breccia lava and stabilizes the basalt columnar joints by consolidation grouting bare unloading relaxation. The practice of the riverbed dam section of the Baihetan dam engineering showed that the pass rate of the permeability rate of inspection holes is 99.3%, the high wave velocity of all kinds of lithology measuring point was 91.8%-93.3%, and the low wave velocity measuring point accounted for 2.0%-2.9%, which met the overall design requirements. The results can be applied to the design of consolidation grouting methods in similar projects.

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rock mass cover / Baihetan Hydropower Station / complex geological conditions / dam foundation

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LUO Guanjun, WANG Kexiang, GUO Zengguang, TAN Yaosheng, AWANG Jiacuo. Consolidation grouting methods for riverbed rock mass coverings of complex dam foundations[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(7): 575-581 https://doi.org/10.16511/j.cnki.qhdxxb.2020.26.010

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