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(1 華東建筑設(shè)計(jì)研究院有限公司地下空間與工程設(shè)計(jì)研究院, 上海 200002; 2 廣州市建筑集團(tuán)有限公司, 廣州 510030; 3 廣州大學(xué)土木工程學(xué)院, 廣州 510006)

摘要: 靜鉆根植樁因其兼顧高承載性能和綠色環(huán)保的優(yōu)勢(shì)而逐步在上海地區(qū)得到應(yīng)用. 雖然上海市《地基基礎(chǔ)設(shè)計(jì)標(biāo)準(zhǔn)》(DGJ 08-11—2018)已將植入樁工法納入到預(yù)制樁的推薦施工工法中,但并未提出相關(guān)的承載力計(jì)算細(xì)則,給靜鉆根植樁設(shè)計(jì)與應(yīng)用帶來了難度與不確定性. 借鑒日本植入樁的承載力計(jì)算思路,等效為預(yù)制樁直徑計(jì)算側(cè)阻力,結(jié)合上海地區(qū)估算樁基承載力的經(jīng)驗(yàn),以單橋靜力觸探比貫入阻力為基本參數(shù),引入側(cè)阻力調(diào)整系數(shù)和擴(kuò)大頭阻力系數(shù)分別計(jì)算樁側(cè)阻力和端阻力,提出了一種實(shí)用的靜鉆根植樁豎向承載力計(jì)算方法. 工程實(shí)例計(jì)算表明,該承載力計(jì)算方法具有一定的可靠性,可為上海地區(qū)靜鉆根植樁設(shè)計(jì)提供參考.

關(guān)鍵詞: 靜鉆根植樁; 承載力; 計(jì)算方法; 靜力觸探比貫入阻力; 靜載試驗(yàn)

中圖分類號(hào):TU473. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)08-0137-06

DOI:10. 19701 / j. jzjg. 20210030

Calculation method of bearing capacity of pre-bored precast pile with enlarged base by index of CPT

WU Jiangbin1, LING Zao2,3, WANG Weidong1, HU Yun1

(1 Underground Space & Engineering Design & Research Institute, East China Architecture Design & Research InstituteCo. , Ltd. , Shanghai 200002, China; 2 Guangzhou Municipal Construction Group Co. , Ltd. , Guangzhou 510030,China; 3 School of Civil Engineering, Guangzhou University, Guangzhou 510006, China)

Abstract: The pre-bored precast pile with enlarged base (PPEB pile) has been gradually applied in Shanghai area becauseof its advantages of high bearing capacity and green environmental protection. Although the embedded pile method has beenincorporated into the recommended construction method of pre-bored precast pile in the Shanghai Foundation design code(DGJ 08-11—2018), but the relevant detailed rules for calculating the bearing capacity have not been put forward, whichbrings difficulty and uncertainty to the design and application of PPEB pile. The idea of calculating the bearing capacity ofpre-bored precast piles in Japan was used for reference, the equivalent diameter of pre-bored precast piles was used tocalculate the shaft resistance. Combined with the experience of estimating the bearing capacity of pile foundation inShanghai area, the specific penetration resistance of single bridge CPT was taken as the basic parameter. The shaftresistance adjustment coefficient and the toe resistance coefficient were introduced to calculate the shaft resistance and toeresistance respectively, and a practical method for calculating the vertical bearing capacity of PPEB pile was put forward.The calculation of engineering example shows that the calculation method of bearing capacity is reliable and can providereference for the design of PPEB pile in Shanghai area.

Keywords:pre-bored precast pile with enlarged base; bearing capacity; calculation method; specific penetration resistanceof CPT; static load test

∗上海市優(yōu)秀學(xué)術(shù)/ 技術(shù)帶頭人計(jì)劃(18XD1 422600),上海市青年科技啟明星計(jì)劃 (18QB1 400300).

第一作者:吳江斌,博士,教授級(jí)高級(jí)工程師,主要從事高層建筑地基基礎(chǔ)、地基處理、地下工程的設(shè)計(jì)與研究,Email:jiangbin_wu@ ecadi. com.

[引用本文] 吳江斌 ,凌造,王衛(wèi)東,等. 基于靜力觸探試驗(yàn)指標(biāo)的靜鉆根植樁承載力計(jì)算方法[ J]. 建筑結(jié)構(gòu),2023,53(8):137-142. WU Jiangbin,LING Zao,WANG Weidong,et al. Calculation method of bearing capacity of prebored precast pile with enlarged base by index of CPT [J]. Building Structure,2023,53(8):137-142.