后注漿對(duì)樁周土層加固作用研究*
包柳青1，周韜1，陳浙兵2，葉建梁3
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（1 杭州天境建筑設(shè)計(jì)有限公司， 杭州 310009; 2 中國建筑技術(shù)集團(tuán)有限公司, 北京 100013; 3 杭州市居住區(qū)發(fā)展中心有限公司， 杭州 310000）
［摘要］通過現(xiàn)場(chǎng)標(biāo)貫試驗(yàn)分析后注漿對(duì)樁周土層的加固作用，分別研究不同水灰比漿液注入時(shí)，距離樁身不同距離處土體標(biāo)貫擊數(shù)的提高情況，并對(duì)試驗(yàn)結(jié)果進(jìn)行對(duì)比分析。結(jié)果表明：后注漿能有效擠密樁周土體，提高土體的標(biāo)貫擊數(shù)，距離樁基越近，加固作用越明顯；水灰比較小的漿液由于注入性較差，引起的樁周擠密作用更明顯，相對(duì)于粉土和黏土而言，漿液對(duì)砂土的擠密加固作用更好。［關(guān)鍵詞］后注漿樁; 標(biāo)貫試驗(yàn); 樁周土中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2016)08-0076-03
Reinforcement effect research of post grouting on soil layers around pileBao Liuqing1, Zhou Tao1, Chen Zhebing2, Ye Jianliang3(1 Hangzhou Tianjing Architecture Design Co., Ltd., Hangzhou 310009, China; 2 China Building Technique Group Co., Ltd., Beijing 100013, China; 3 Hangzhou Residential Development Center Co., Ltd., Hangzhou 310000, China)Abstract: The reinforcement effect of post grouting on soil layers around pile was analyzed through field standard penetration test. The improvement situation of soil standard penetration test (SPT) blow counts at soil layers with different distances from the pile was studied respectively when slurries with different water-cement ratios were injected, and the test results were compared and analyzed. The results show that post grouting can effectively compact soil around the pile and improve soil SPT blow counts. The reinforcement effect is more obvious when post grouting is closer to the pile. The injection effect of the slurry with small water-cement ratio is poor so as to bring more obvious compaction effect on soil around the pile. With respect to the silt and clay soils, the compaction and reinforcement effects of slurry on sand are better.Keywords:post grouting pile; standard penetration test; soil around the pile
*杭州市建委科技研究項(xiàng)目（201251）。作者簡(jiǎn)介：包柳青，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：tianren9@vip.sina.com。
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