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（1 太原理工大學(xué)建筑與土木工程學(xué)院， 太原 030024； 2 北京市勘察設(shè)計(jì)研究院有限公司，北京  100038； 3 陜西龍海工程建設(shè)有限公司， 西安 710003）

［摘要］由傳統(tǒng)技術(shù)改進(jìn)而來(lái)的內(nèi)外套管組合沉管夯擴(kuò)法，是一種利用內(nèi)外套管組合沉管成孔，加大成孔深度，再由重錘二次夯擴(kuò)擠密的新技術(shù)，地基處理深度可達(dá)60m。結(jié)合具體的工程，對(duì)在大厚度濕陷性黃土地基中使用該方法成樁的樁長(zhǎng)26，32，35m的灰土擠密樁和樁長(zhǎng)20，32，36m的水泥土擠密樁進(jìn)行現(xiàn)場(chǎng)試驗(yàn)研究，測(cè)得兩種樁間土擠密系數(shù)均不小于0-93，樁體壓實(shí)系數(shù)均不小于0-97，濕陷系數(shù)均小于0-015，滿足規(guī)范要求；同時(shí)承載力也滿足設(shè)計(jì)要求。

［關(guān)鍵詞］大厚度濕陷性黃土； 內(nèi)外套管組合沉管夯擴(kuò)法； 地基處理

中圖分類號(hào)：TU444文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)06-0134-04

Field test study on sinking ramming by combination of internal and external casing method in  thick collapsible loess foundation

Wang Ding1, Ge Xinsheng1, Zhen Zheng1, Li Bin2， Liu Qingjie3

(1 School of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2 Beijing Geotechnical Institute Co., Ltd.,  Beijing 100038, China;  3 Shaanxi Longhai Engineering Construction Co., Ltd., Xi′an 710003, China)

Abstract:The sinking ramming by combination of internal and external casing method is obtained  by  improving traditional technology. It is a new technology that makes use of combination of internal and external casing to sink and form holes, enlarges the depth of hole formation, and then uses heavy hammer to compact by twice sinking and ramming. The depth of foundation treatment can reach 60m. Combining with specific projects, field test study of lime-soil compaction pile length of 26, 32 and 35m and cement-soil compaction pile length of 20, 32 and 36m which formed by the above-mentioned method were carried out on thick collapsible loess foundation. The results show that the compaction coefficient of soil between piles is not less than 0-93, the compaction coefficient of pile body is not less than 0-97, the collapsibility coefficient is less than 0-015, which meets the requirements of specifications, and the bearing capacity also meets the design requirements. 

Keywords:thick collapsible loess; sinking ramming by combination of internal and external casing method; foundation treatment

作者簡(jiǎn)介：王鼎，碩士，Email:476565534@qq.com。