- 摘 要
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(1西南交通大學巖土工程系， 成都 610031； 2鐵道第三勘察設計院集團有限公司， 天津 300142)
［摘要］為了對樁筏結構載體樁復合地基在高速鐵路深厚軟弱地基加固中的沉降特性進行研究，采用單點沉降計與液位沉降計的聯合監(jiān)測法，在京滬高速鐵路廊坊試驗段進行了載體樁與CFG樁復合地基沉降變形的對比試驗。結果表明：本試驗段工后沉降均滿足設計要求；受樁長影響，載體樁復合地基沉降約為CFG樁復合地基的2倍，同時其沉降穩(wěn)定所需時間也相對較長。
［關鍵詞］高速鐵路; 載體樁; CFG樁; 樁筏基礎; 沉降變形
中圖分類號：TU473 文獻標識碼：A 文章編號：1002-848X(2014)08-0037-03
Research on settlement characteristics of ram-compacted piles with bearing base composite foundation
Chen Hongyun1, Ma Jianlin1, Xu Zailiang2, Song Xuguo2
(1 Geotechnical Engineering Department, Southwest Jiaotong University, Chengdu 610031, China; 2 The Third Railway Survey and Design Institute Group Corporation, Tianjin 300142, China)
Abstract: To study the settlement characteristics of ram-compacted piles with bearing base (RPBB) composite foundation with pile-raft structure, which is used to reinforce the deep and soft foundation of high-speed railway, tests on settlements of RPBB and cement fly-ash gravel (CFG) piles composite foundations were carried out and compared in the Langfang test section of the Beijing-Shanghai high speed railway by the combined test method of the single-point settlement meter and the hydrostatic level. Results show that the settlements after construction all meet the design requirements in the test section. Because the reinforced depth of RPBB is limited, the settlement of RPBB composite foundation is about double of CFG pile composite foundation settlement and times needed to the settlement stabilization of the RPBB composite foundation lasts longer.
Keywords: high-speed railway; ram-compacted piles with bearing base; cement fly-ash gravel pile; pile-raft foundation; settlement and deformation
*鐵道部京滬高速鐵路科技重大專項（2008G32-A）。
作者簡介：陳洪運，博士研究生，Email: 278709407@qq.com。
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