Mechanism study between earth-rock mixture in pit backfill and super-high arch dam
LIN Peng1，LI Ming1，PENG Haoyang1，WEI Pengcheng1，ZHOU Shaowu2，TAN Yaosheng3
(1. Department of Hydraulic Engineering，Tsinghua University，Beijing 100084，China；2. Shanghai Investigation，Design and Research Institute Co.，Ltd，Shanghai 200335，China；3. China Three Gorges Projects Development Co.，Ltd，Chengdu，Sichuan 610041，China)
Abstract：Mechanism study between earth-rock mixture in pit backfill and super-high arch dam is of great significance to save dam stability during the initial impoundment and operating period. Based on the backfill design，construction and site monitoring experience of super-high arch dams such as Xiaowan，Baihetan and Wudongde，a mechanism model of the backfill earth-rock mixture and dam was proposed. Combined with theoretical and the finite element simulation method，three aspects of the mechanism are discussed including dam foundation seepage field distribution，the heat exchange state of the dam upstream surface and the overall working behavior of the dam-foundation. The analysis results shows that：(1) Backfill shows a reduction effect on seepage behavior by reinforcing bedrock fissures and extending seepage paths，and its height，equivalent permeability coefficient are the main factors. (2) Backfill enhances insulation effect of the dam surface，favorable for dam cracking control. (3) Backfill improves seismic behavior，and ameliorates the dam stress state during the construction stage. The general design principle and work flow for backfill construction of a super high arch dam is proposed，which can be used for reference in similar engineering construction.
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2019, Vol. 38 
