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（廣州集群巖土工程有限公司， 廣州 510000）

［摘要］類剛性大直徑旋噴（攪拌）樁是一種具有高強(qiáng)度、大直徑、強(qiáng)切土能力綜合特點(diǎn)的水泥土樁，其類剛性的強(qiáng)度指標(biāo): 在含水量約80%的流塑狀淤泥地層中，大于等于28d齡期的水泥土強(qiáng)度qu≥1.5~2.0MPa。經(jīng)過多年的理論→實(shí)踐→理論的反復(fù)研究，以高效、節(jié)能、環(huán)保為目標(biāo)的設(shè)備成果使最大樁徑已達(dá)到1800mm，最大樁長(zhǎng)達(dá)32m。同時(shí)，還發(fā)展起類剛性大直徑旋噴（攪拌）樁+混凝土樁組合的新樁型。以類剛性為主題的大直徑水泥土樁，在基坑支護(hù)工程的應(yīng)用中，取得了安全、經(jīng)濟(jì)的特殊效果——以坑內(nèi)無(wú)撐、坑外無(wú)錨為特點(diǎn)的類剛性水泥土（格構(gòu)）墻，最大開挖深度已達(dá)11.4m（寬高比b/h≈0.45）；1800類剛性水泥土（加勁）墻，開挖深度已達(dá)8.0m（寬高比b/h≈0.23）。并且，按類剛性水泥土墻+冠梁模型進(jìn)行設(shè)計(jì)的基坑支護(hù)工程，取得了變形控制計(jì)算值與實(shí)測(cè)值基本相當(dāng)?shù)某晒?/span>

［關(guān)鍵詞］類剛性； 水泥土樁； 水泥土（加勁）樁； 類剛性水泥土（加勁）墻； 冠梁

中圖分類號(hào)： TU473    文獻(xiàn)標(biāo)識(shí)碼： A    文章編號(hào)： 1002-848X(2015)S2-0235-05

Development and application of as-unyielding large-diameter rotary

 jet （mixing）pile in excavations

Deng Jianmin, Yu Hongzhi, Lu Xinya

(Guangzhou Jiqun Geotechnical Engineering Ltd., Guangzhou 510000, China)

Abstract: As-unyielding large-diameter rotary jet（mixing）pile is a cement-soil pile having high intensity-large diameter-strong setsudo capabilities integrated features, the as-unyielding strength index: in current-formed silt who′s water content is about 80%, the strength of the cement-soil qu≥1.5~2.0MPa not less than 28 days. In these years, after much research in the theory and practice, efficient, energy, green as the goal of equipment outcomes, the maximum diameter has been reached 1800mm, the maximum length has been reached 32m. Simultaneously, the new type of pile by as-unyielding large-diameter rotary jet （mixing） pile and concrete pile combination has been developed. As-unyielding as the main feature of the large-diameter cement-soil pile, it has obtain special effects in security and economic in the application of the excavation project. The as-unyielding cement-soil (trellis) wall who′s characteristic is the excavations without strut inside and without anchor outside, the maximum excavation depth reached 11.4m (aspect ratio b/h≈0.45). The as-unyielding cement-soil (stiffening) wall who′s diameter is 1800mm, the maximum excavation depth reached 8.0m (aspect ratio b/h≈0.23). And, when using the as-unyielding cement-soil wall and capping beam model to design the excavation projects, the results of that the deformation control calculated values and measured values roughly equal.

作者簡(jiǎn)介:鄧鑒敏,碩士,副總工程師,Email:newsfj@163.com。