2012年9月下 施工技术 第41卷第373期 CONSTRUCTION TECHNOLOGY 109 大直径碎石桩软土成桩工艺研究 张蓓1，杨晓杰2，刘洋2，马骄2，田弋弘2，李少华2 (1.上海建峰取业技术学晓土木系，上海201900；2.中国矿业大学（北京）力学与建筑工程学院，北京100083) [摘要]采用振冲法和沉管法在低强度软土中施工大直径碎石桩，得到两种工法的施工控制参数，并对碎石桩桩身 进行超重型动力触探检测.结果表明，振冲法和沉管法均可在不固结不排水强度小于15kPa的软土中成桩，振冲 法施工碎石桩密实度高，均匀性较差，成桩长度不宜大于10，沉管法施工碎石桩密实度较高，均匀性较好，成桩长 度可达14~15m. [关键词]地下工程：柱基础：碎石柱；振冲法；沉管法；动力触探试验 [中图分类号]TU753.1;TU447 [文献标识码]A [文章编号]1002-8498(2012)18-0109-04 Construction Technology of Large-diameter Gravel Piles in Soft Soil Zhang Bei' Yang Xiaojie2 Liu Yang2 Ma Jiao2.Tian Yihong? Li Shaohua2 (1.Civil Engineering Department Shanghai Jianfeng College of Career Technology Shanghai 201900 China; 2.School of Mechanics Cisil Engineering China University of Mining Technology Beijing 100083 China) Abstract:Based on constructing gravel piles in soft soil the controlling parameters of vibroflotation piles and sinking pipe piles are obtained.The quality of piles are tested with dynamic penetration tests.The test results show that both the two kind piles can be formed in soft soil with less than 15kPa un- consolidation and undrained strength.Both of the two kinds of gravel plies have high density.The uniformity of vibroflotation gravel piles is poorer than piles constructed with sinking pipe method and the length of vibroflotation gravel plies should not be longer than 10m.However the length of vibroflotation gravel plies can reach 14-15m. Key words:underground;piles;gravel piles;vibroflotation method;sinking pipe method;dynamic penetr...
大直径碎石桩软土成桩工艺研究.pdf
