改扩建垃圾填埋场复合土石坝体快速施工技术

Rapid Construction Technique for Composite Earth-rock Dam in the Expansion and Reconstruction of Landfill Sites

以广州市增城区棠厦改扩建垃圾填埋场为例,针对坝体施工、运营期填料内含水量大、排水困难及新旧坝体衔接处施工等重难点问题进行分析,通过改良水泥碎石回填土、坡面外侧叠放碎石编织袋(内含排水暗沟)及高压注浆加固等全新复合土石坝体施工技术,解决施工难题。该施工技术有较好的适用性,可供类似工程借鉴。

Taking the expansion and reconstruction of the Tangxia Landfill Site in Zengcheng District,Guangzhou City as an example,this paper analyzes key and difficult issues such as high moisture content in the fill material during dam construction and operation,drainage difficulties,and construction at the junction of the new and old dam bodies.By adopting innovative composite earth-rock dam construction techniques including improved cemented gravel backfill soil,stacking woven bags filled with gravel(containing concealed drainage ditches)on the outer slope,and high-pressure grouting reinforcement,the construction challenges are effectively addressed.This construction technique has good applicability and can serve as a reference for similar projects.