爆破堆石坝体造孔混凝土防渗墙试验槽段设计探讨

A Probe into the Design of Test Channel Section of Pore-forming Concrete Cutoff Wall on the Blasting Rockfill Dam

爆破堆石坝由于坝体组成颗粒极不均匀,结构松散、复杂,架空现象明显,坝体防渗处理是一个难点;当坝体防渗处理采用混凝土防渗心墙时,造孔槽段直接影响防渗墙的顺利修筑及施工质量。通过合理选取己衣水库混凝土防渗心墙造孔试验槽段,采取两种不同的施工工艺,详细分析槽孔充盈系数、成墙厚度,并针对施工中遇到的特殊情况(孔斜、塌孔、漏浆、卡钻)给出了相应的处理措施,取得了造孔混凝土防渗墙的施工工艺,再大范围施工,效果明显,为今后类似工程的设计与施工提供了丰富的经验。

The particles for composing blasting rockfill dams are quite uneven ,with loose and complex structures .And an obvious o‐verhead phenomenon can also be observed .Therefore ,the seepage control for the dam is a quite difficult task .When the concrete cutoff wall is adopted for the seepage control of the dam ,the pore-forming channel sections directly affect the construction process and the construction quality of cutoff walls .In this paper ,we first select pore-forming test channel section of Jiyi Reservoir concrete cutoff .Then ,a detailed analysis of slot filling coefficient and wall thickness is made under two different construction processes .For some special situation encountered in construction ,such as hole deviation ,hole collapse ,leakage ,and sticking ,we offer some corre‐sponding treatment measures .Finally ,the construction technology of pore-forming concrete cutoff wall is well-achieved ,and a wide range of construction is performed with an obvious effect .The outcome of the paper provides a wealth of experience for future similar project construction .