“吊脚桩”桩锚支护在土岩组合地层深基坑工程中的应用研究
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摘要
以济南黄金国际广场项目深基坑工程为例,针对土岩组合地层的特点,采用"吊脚桩"桩锚支护及两桩一锚布设方式的设计方案。对基坑设计、锚索试验、基坑监测等内容进行介绍,现场进行了锚索验收试验,试验结果符合设计要求。监测结果表明,基坑支护结构变形、周边建筑物沉降等均处于安全状态,远小于报警值,说明"吊脚桩"桩锚支护在土岩组合地层深基坑工程中的应用效果非常好,同时大大节省了造价,短缩了工期。本文的相关设计方法、试验、监测成果可为类似工程提供借鉴。
Take the deep foundation pit project of Jinan Gold International Plaza as an example, in view of the characteristics of soil rock combination formation, the support design with suspended piles and anchor cables in the layout of two piles plus one anchor was adopted. The design of the foundation pit, test of anchor cables and monitoring of the foundation pit are introduced. The acceptance test of anchor cables was carried out on site, and the test results meet the design requirements. The monitoring results show that the deformation of the supporting structure of the foundation pit and the settlement of the surrounding buildings are all in a safe state, which is far less than the alarm value, indicating that the application of the suspended piles and anchor support in the deep foundation pit in the soil rock composite stratum is very good with less costs and short construction period. The relevant design methods, experiments and monitoring results can provide reference for similar projects.
Take the deep foundation pit project of Jinan Gold International Plaza as an example, in view of the characteristics of soil rock combination formation, the support design with suspended piles and anchor cables in the layout of two piles plus one anchor was adopted. The design of the foundation pit, test of anchor cables and monitoring of the foundation pit are introduced. The acceptance test of anchor cables was carried out on site, and the test results meet the design requirements. The monitoring results show that the deformation of the supporting structure of the foundation pit and the settlement of the surrounding buildings are all in a safe state, which is far less than the alarm value, indicating that the application of the suspended piles and anchor support in the deep foundation pit in the soil rock composite stratum is very good with less costs and short construction period. The relevant design methods, experiments and monitoring results can provide reference for similar projects.
引文
[1] 鲍树峰,邱青长,罗彦,等.土岩组合基坑施工监控技术研究[J].岩石力学与工程学报,2014,33(S1):3270-3276. BAO Shufeng, QIU Qingchang, LUO Yan, et al. Study of monitoring techniques of foundation pit composed of soil and rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2014,33(S1):3270-3276.
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[3] 刘红军,王亚军,姜德鸿,等.土岩组合双排吊脚桩桩锚支护基坑变形数值分析[J].岩石力学与工程学报,2011,30(S2):4099-4103. LIU Hongjun, WANG Yajun, JIANG Dehong, et al. Numerical analysis of deep foundation pit displacement with double-row end-suspended piles in strata of soil-rock dualistic structure[J]. Chinese Journal of Rock Mechanics and Engineering, 2011,30(S2):4099-4103.
[4] 赵文强.上软下硬复合地层条件下深基坑支护设计探析[J].隧道建设,2014,34(2):153-157. ZHAO Wenqiang. Design of support of deep foundation pits in hard-soft heterogeneous ground[J]. Tunnel Construction, 2014,34(2):153-157.
[5] 万鸿,宿星,叶伟林,等.预应力锚索地梁在矿山已变形边坡加固中的应用[J].探矿工程(岩土钻掘工程),2017,44(7):71-75. WAN Hong, SU Xing, YE Weilin, et al. Application of pre-stressed anchor cable groundsill in reinforcement engineering of deformed mine slope[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2017,44(7):71-75.
[6] 邓春海,张耕念,王守江.吊脚支护桩在康大凤凰国际基坑中的应用[J].岩土工程技术,2011,25(3):125-127. DENG Chunhai, ZHANG Gengnian, WANG Shoujiang. The use of un-embeded piles in the Kangda International Building foundation pit[J]. Geotechnical Engineering Technique, 2011,25(3):125-127.
[7] 杨志银,张俊.深圳地区深基坑支护技术的发展和应用[J].岩石力学与工程学报,2006,25(S2):3377-3383. YANG Zhiyin, ZHANG Jun. Development and application of supporting techniques for deep foundation pit excavation in Shenzhen region[J]. Chinese Journal of Rock Mechanics and Engineering, 2006,25(S2):3377-3383.
[8] 赵辉.预应力锚索在基坑超深开挖中的应用及分析[J].建筑科学,2010,26(7):102-104,71. ZHAO Hui. The application and analysis of prestressed anchoring cable in ultra-deep excavation pit[J]. Building Science, 2010,26(7):102-104,71.
[9] 王全成,姜昭群,罗宏保,等.自承载式预应力锚索现场试验研究[J].探矿工程(岩土钻掘工程), 2018,45(8):79-82,87. WANG Quancheng, JIANG Zhaoqun, LUO Hongbao, et al. Field test of self-bearing pre-stressed anchor cable[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(8):79-82,87.
[10] JGJ 120-2012,建筑基坑支护规程[S]. JGJ 120-2012, Technical specification for retaining and protection of building foundation excavations[S].
[11] 杨春柳.地铁车站超深基坑围护结构变形监测结果分析[J].探矿工程(岩土钻掘工程),2018,45(6):47-51. YANG Chunliu. Analysis on deformation monitoring results of retaining structure in subway extra-deep foundation pit[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(6):47-51.
[12] 袁金荣,赵福勇.基坑变形预测的时间序列分析[J].土木工程学报,2001,34(6):55-59. YUAN Jinrong, ZHAO Fuyong. Predicting deformation of foundation pit using ANN[J]. China Civil Engineering Journal, 2001,34(6):55-59.
[13] 徐中华,王卫东.深基坑变形控制指标研究[J].地下空间与工程学报,2010,6(3):619-626. XU Zhonghua, WANG Weidong. Deformation control criteria of deep excavations[J]. Chinese Journal of Underground Space and Engineering, 2010,6(3):619-626.
[14] 石汉生,周念清,周洪波.港湾广场(一期)深基坑变形监测与分析[J].岩土工程技术,2007,21(6):279-284. SHI Hansheng, ZHOU Nianqing, ZHOU Hongbo. Deformation monitoring and inverse analysis of deep foundation pit of Gangwan Plaza (phase 1)[J]. Geotechnical Engineering Technique, 2007,21(6):279-284.
[15] 李芳,李强,于元峰,等.桩锚支护结构设计及支护结构变形监测分析[J].探矿工程(岩土钻掘工程),2015,42(4):53-57,62. LI Fang, LI Qiang, YU Yuanfeng, et al. Design of pile-anchor retaining structure and the analysis on its deformation monitoring[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2015,42(4):53-57,62.
[16] 白晓宇,张明义,袁海洋.移动荷载作用下土岩组合基坑吊脚桩变形分析[J].岩土力学,2015,36(4):1167-1173,1181. BAI Xiaoyu, ZHANG Mingyi, YUAN Haiyang. Deformation analysis for the end-suspended piles in the combined soil-rock foundation pits under moving loadings[J]. Rock and Soil Mechanics, 2015,36(4):1167-1173,1181.
[2] 李宁宁,董亚男,孙建成.上软下硬地层基坑支护型式——吊脚桩支护结构分析[J].平顶山工学院学报,2013,22(2):14-17. LI Ningning, DONG Yanan, SUN Jiancheng. Analysis of foot-hanging pile retaining structure in upper-soft lower-hard ground[J]. Journal of Pingdingshan Technology University, 2013,22(2):14-17.
[3] 刘红军,王亚军,姜德鸿,等.土岩组合双排吊脚桩桩锚支护基坑变形数值分析[J].岩石力学与工程学报,2011,30(S2):4099-4103. LIU Hongjun, WANG Yajun, JIANG Dehong, et al. Numerical analysis of deep foundation pit displacement with double-row end-suspended piles in strata of soil-rock dualistic structure[J]. Chinese Journal of Rock Mechanics and Engineering, 2011,30(S2):4099-4103.
[4] 赵文强.上软下硬复合地层条件下深基坑支护设计探析[J].隧道建设,2014,34(2):153-157. ZHAO Wenqiang. Design of support of deep foundation pits in hard-soft heterogeneous ground[J]. Tunnel Construction, 2014,34(2):153-157.
[5] 万鸿,宿星,叶伟林,等.预应力锚索地梁在矿山已变形边坡加固中的应用[J].探矿工程(岩土钻掘工程),2017,44(7):71-75. WAN Hong, SU Xing, YE Weilin, et al. Application of pre-stressed anchor cable groundsill in reinforcement engineering of deformed mine slope[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2017,44(7):71-75.
[6] 邓春海,张耕念,王守江.吊脚支护桩在康大凤凰国际基坑中的应用[J].岩土工程技术,2011,25(3):125-127. DENG Chunhai, ZHANG Gengnian, WANG Shoujiang. The use of un-embeded piles in the Kangda International Building foundation pit[J]. Geotechnical Engineering Technique, 2011,25(3):125-127.
[7] 杨志银,张俊.深圳地区深基坑支护技术的发展和应用[J].岩石力学与工程学报,2006,25(S2):3377-3383. YANG Zhiyin, ZHANG Jun. Development and application of supporting techniques for deep foundation pit excavation in Shenzhen region[J]. Chinese Journal of Rock Mechanics and Engineering, 2006,25(S2):3377-3383.
[8] 赵辉.预应力锚索在基坑超深开挖中的应用及分析[J].建筑科学,2010,26(7):102-104,71. ZHAO Hui. The application and analysis of prestressed anchoring cable in ultra-deep excavation pit[J]. Building Science, 2010,26(7):102-104,71.
[9] 王全成,姜昭群,罗宏保,等.自承载式预应力锚索现场试验研究[J].探矿工程(岩土钻掘工程), 2018,45(8):79-82,87. WANG Quancheng, JIANG Zhaoqun, LUO Hongbao, et al. Field test of self-bearing pre-stressed anchor cable[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(8):79-82,87.
[10] JGJ 120-2012,建筑基坑支护规程[S]. JGJ 120-2012, Technical specification for retaining and protection of building foundation excavations[S].
[11] 杨春柳.地铁车站超深基坑围护结构变形监测结果分析[J].探矿工程(岩土钻掘工程),2018,45(6):47-51. YANG Chunliu. Analysis on deformation monitoring results of retaining structure in subway extra-deep foundation pit[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(6):47-51.
[12] 袁金荣,赵福勇.基坑变形预测的时间序列分析[J].土木工程学报,2001,34(6):55-59. YUAN Jinrong, ZHAO Fuyong. Predicting deformation of foundation pit using ANN[J]. China Civil Engineering Journal, 2001,34(6):55-59.
[13] 徐中华,王卫东.深基坑变形控制指标研究[J].地下空间与工程学报,2010,6(3):619-626. XU Zhonghua, WANG Weidong. Deformation control criteria of deep excavations[J]. Chinese Journal of Underground Space and Engineering, 2010,6(3):619-626.
[14] 石汉生,周念清,周洪波.港湾广场(一期)深基坑变形监测与分析[J].岩土工程技术,2007,21(6):279-284. SHI Hansheng, ZHOU Nianqing, ZHOU Hongbo. Deformation monitoring and inverse analysis of deep foundation pit of Gangwan Plaza (phase 1)[J]. Geotechnical Engineering Technique, 2007,21(6):279-284.
[15] 李芳,李强,于元峰,等.桩锚支护结构设计及支护结构变形监测分析[J].探矿工程(岩土钻掘工程),2015,42(4):53-57,62. LI Fang, LI Qiang, YU Yuanfeng, et al. Design of pile-anchor retaining structure and the analysis on its deformation monitoring[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2015,42(4):53-57,62.
[16] 白晓宇,张明义,袁海洋.移动荷载作用下土岩组合基坑吊脚桩变形分析[J].岩土力学,2015,36(4):1167-1173,1181. BAI Xiaoyu, ZHANG Mingyi, YUAN Haiyang. Deformation analysis for the end-suspended piles in the combined soil-rock foundation pits under moving loadings[J]. Rock and Soil Mechanics, 2015,36(4):1167-1173,1181.