- 摘 要
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(1 廣州市設計院集團有限公司, 廣州 510620; 2 廣州建筑股份有限公司, 廣州 510030;3 廣州市建筑集團有限公司, 廣州 510030; 4 華南理工大學土木與交通學院, 廣州 510640)
摘要: 雖然利用注氣增壓能夠提高軟土地基真空排水固結效果,但也存在著固結周期長、固結范圍有限、排水通道淤堵等不足。 針對上述問題,在分析現(xiàn)有增壓式真空排水固結技術缺陷的基礎上,提出了以透水混凝土管樁為增壓/ 真空排水通道的正負壓剛性樁復合地基技術,通過分析孔隙水的遷移規(guī)律,構建了新型正負壓施加模式及防淤堵的濾膜孔徑選擇標準;并針對地層差異開發(fā)了適應多場地的樁身開孔措施及密封技術。 工程實踐結果證明,正負壓剛性樁復合地基技術能夠充分利用預制樁高承載力和增壓式真空排水迅速的優(yōu)勢,克服現(xiàn)階段真空排水固結技術的一系列缺陷,實現(xiàn)軟土地基的快速高效加固。 研究成果及思路可以為沿海地區(qū)軟土地基處理提供技術指導和借鑒。
關鍵詞: 正負壓; 剛性樁復合地基; 增壓模式; 防淤堵技術; 排水固結
中圖分類號:TU472. 3 文獻標志碼:A 文章編號:1002-848X(2022)24-0100-06
DOI:10. 19701 / j. jzjg. ZJ220059
Study on key technologies of rigid pile composite foundation incorporated with adjustable positive-negative air pressure
HUANG Junguang1,2,3, ZHANG Heng1,2,3,4, LI Weike1,2,3, LI Lei1,2,3
(1 Guangzhou Design Institute Group Co. , Ltd. , Guangzhou 510620, China; 2 Guangzhou Municipal ConstructionCo. , Ltd. , Guangzhou 510030, China; 3 Guangzhou Construction Group Co. , Ltd. , Guangzhou 510030, China;4 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China)
Abstract: Although the method of injecting gas pressurization can improve the effect of vacuum drainage consolidation ofsoft soil foundation, it also induces some problems such as the long consolidation period, insufficient consolidation extentand blockage of drainage channel. Aim at above problems, on the basis of analyzing the defects of existing pressurizedvacuum drainage consolidation technology, the rigid pile composite foundation incorporated with adjustable positive-negativeair pressure was proposed, in which the perforated concrete pile was used as the air-boosted or vacuum drainage channel,and the applying pattern of positive-negative air pressure and the selection criteria of anti-siltation filter diameter wereestablished by analyzing the pore water migration law. In addition, according to the difference of strata, the measures ofhole opening and sealing technology of pile body suitable for multiple sites were developed. The practice results of actualprojects show that the rigid pile composite foundation incorporated with adjustable positive-negative air pressure can fullyutilize both the advantages of high bearing capacity of prefabricate pile and rapid drainage of vacuum preloading, canovercome a series of shortcomings of vacuum preloading technology, which realizes rapid and efficient consolidated of softsoil foundation. Research results and ideas can provide technical guidance and reference for soft soil foundation treatment incoastal area.
Keywords:positive-negative air pressure; rigid pile composite foundation; increase pattern of air pressure; anti-siltingtechnology; drainage consolidation
∗廣州市建筑集團有限公司科技計劃資助項目(2021-KJ006、2022-KJ017)。
第一作者:黃俊光,碩士,教授級高級工程師,注冊土木工程師(巖土),主要從事巖土工程設計工作,Email: hj020@ 126. com。
[引用本文] 黃俊光,張恒,李偉科,等. 可調(diào)控正負壓剛性樁復合地基關鍵技術研究[ J]. 建筑結構,2022,52(24):100-105. HUANG Junguang,ZHANG Heng,LI Weike, et al. Study on key technologies of rigid pile compositefoundation incorporated with adjustable positive-negative air pressure[J]. Building Structure,2022,52(24):100-105.
