强夯在特高压换流站块石回填地基处理中的应用  

Application of Dynamic Compaction in Backfilling Foundation Treatment of Block Stone in UHV Converter Station

作　　者：雷晓标 张玉明 LEI Xiao-biao;ZHANG Yu-ming(Central Southern E1ectric Power Design Institute Co.,Ltd.of CPECC,Wuhan 430071,China;Northwest Electric Power Design Institute Co.,Ltd.of CPECC,Xi'an 710075,China)

机构地区：[1]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [2]中国电力工程顾问集团西北电力设计院有限公司,陕西西安710075

出　　处：《电力勘测设计》2022年第5期51-54,76,共5页Electric Power Survey & Design

摘　　要：某换流站站址地形自然高差大,表层为粉砂,下覆中风化及强风化砂岩。填方区采用挖方区的块石和粉砂进行回填,回填粒径控制在30 cm以内,需处理深度为0~10.5 m。根据试夯结果,采取6000 kN·m和2000 kN·m两种主夯夯击能及对应满夯夯击能对场地进行分层强夯,场平结合强夯进行地基处理。通过检测,处理后地基承载力、变形模量和密实度均满足设计要求。实践证明,针对块石回填地基采用强夯地基处理方式,不但能满足设计要求,而且能缩短施工周期,为块石回填地基的强夯有效加固深度提供试验数据。The site of a converter station has a large natural elevation difference,the surface is silty sand,and the underlay is moderately weathered and strongly weathered sandstone.The filling area is backfilled with blocks and silt from the excavation area,the backfill particle size is controlled within 30 cm,and the treatment depth is 0~10.5 m.According to the test results,the site is layered and compacted by two main ramming energies of 6000 kN·m and 2000 kN·m and corresponding full ramming energies,and the dynamic compaction and ground treatment are executed at the same time.Through testing,the foundation bearing capacity,deformation modulus and compactness all meet the design requirements.Practice has proved that dynamic compaction is used as a foundation treatment method for the block stone backfill foundation,which not only meets the design requirements,but also shortens the construction period and achieves good economic results.It provides test data for the effective reinforcement depth of dynamic compaction of rock backfill foundation.

关 键 词：特高压换流站 强夯 块石 回填地基 

分 类 号：P642[天文地球—工程地质学]