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| ARCHING MONITORING AND ANALYSIS OF GRAVELLY SOIL COREWALL IN PUBUGOU DAM DURING CONSTRUCTION PERIOD |
| CHEN Xianghao1，DENG Jianhui1，LI Peng2，KE Hu3 |
(1. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；
2. Pubugou Hydropower Station Construction，Company Guodian Dadu River Co. Ltd.，Ya?an，Sichuan 625300，China；
3. Valley Repair and Installation Company，Guodian Dadu River Co. Ltd.，Leshan，Sichuan 614900，China) |
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Abstract Excessive arching existing in the high rockfill dam corewall during construction period，is inclined to produce the hydraulic fracturing and concentrated leakage consequently during the storage period. Therefore，the analysis and evaluation of the arching characteristics of high corewall rockfill dam during construction period，is of high-guiding significance to the progress of following storage and the consequently construction of higher rockfill dam corewall in domestic. Based on the stress monitoring data of gravelly soil corewall in Pubugou dam during construction period，and combined with the practical deformation monitoring data，using the actual construction process and field building procedure，the arching in gravelly soil corewall have been analyzed during construction period in time and space scale respectively. Analysis found that：arching during construction period is gradually shown with the accompany of the construction and consolidation progress. With the increasing of dam height and the passing of time，the arching is more and move obvious. The strongest arching of corewall occurs in the 1/3 height of dam. Except the vicinity of contact surface between core and shell，the place near the dam axis also have strong arching. To reduce the arching during construction period，the upstream and downstream dam shell should always being watered，and the height of corewall should be kept slightly higher than the dam shell，and the valley higher than the slope.
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Received: 17 December 2010
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2011, Vol. 30 
