电厂循环管淤泥质地基过大沉降加固效果研究
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摘要
海相淤泥质土具有含水量高、压缩性强及承载力低等特性,工程实践地基处治后服役期一旦出现沉降过大现象,不仅治理费用昂贵且二次加固技术要求较高。依托印度尼西亚雅加达湾北部龙湾3×315 MW燃煤电厂循环管地基工程为背景,在分析循环管地基原"真空预压+竹桩"处治措施的基础上,借助实测数据从设计、施工及管理等方面阐述了地基过大沉降的原因;考虑加固中循环管保持正常工作因素,提出"循环管两侧高压双管旋喷桩+循环管道下部双液注浆"二次集成加固方案。综合测试和数值计算结果可知,二次加固方案实施后循环管地基沉降得到控制,测试50 d(趋于稳定)累计沉降约为22 mm;计算预测30年累计沉降约为48 mm(5 cm以内),沉降速率小于0.01 mm/d;实测和计算均验证加固控制效果较好。研究成果能为类似工程实践提供理论参考。
The marine muddy soil has the characteristics of high water content,strong compressibility and low bearing capacity. After the engineering practice and the service period,the sedimentation is too large,which is expensive and the secondary reinforcement technology is high. Based on the analysis of the "vacuum preloading and bamboo pile"treatment measures of circulating pipe foundation in the north of Jakarta Bay,Indonesia,the design of the measured data is from the aspects of design,construction and management. This paper expounds the reason of the large settlement of the foundation. Considering the normal working factors of the circulating pipe in the reinforcement,the author puts forward the second integrated reinforcement scheme of the double-liquid grouting pile on the two sides of the circulating pipe. According to the results of comprehensive test and numerical calculation,it can be seen that the settlement of the recirculating pipe is controlled after the second reinforcement scheme is carried out. The cumulative settlement is about 22 mm for 50 days( stable). The cumulative sedimentation is about 48 mm( within 5 cm) and the settling rate is less than 0.01 mm/Day; measured value and calculated value to verify the reinforcement control effect are better. The research results can provide reference data for similar engineering practices.
The marine muddy soil has the characteristics of high water content,strong compressibility and low bearing capacity. After the engineering practice and the service period,the sedimentation is too large,which is expensive and the secondary reinforcement technology is high. Based on the analysis of the "vacuum preloading and bamboo pile"treatment measures of circulating pipe foundation in the north of Jakarta Bay,Indonesia,the design of the measured data is from the aspects of design,construction and management. This paper expounds the reason of the large settlement of the foundation. Considering the normal working factors of the circulating pipe in the reinforcement,the author puts forward the second integrated reinforcement scheme of the double-liquid grouting pile on the two sides of the circulating pipe. According to the results of comprehensive test and numerical calculation,it can be seen that the settlement of the recirculating pipe is controlled after the second reinforcement scheme is carried out. The cumulative settlement is about 22 mm for 50 days( stable). The cumulative sedimentation is about 48 mm( within 5 cm) and the settling rate is less than 0.01 mm/Day; measured value and calculated value to verify the reinforcement control effect are better. The research results can provide reference data for similar engineering practices.
引文
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[6]王文军,刘用海,朱向荣.宁波海相软土工程特性研究[J].工程勘察, 2008(10):19-24.(Wang Wunjun, Liu Yonghai, Zhu Xiangrong. Study on engineering characteristics of marine soft soil in[J].Engineering Investigation, 2008(10):19-24.(in Chinese))
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[9]杨逾,郑志明.基于范例推理的软基处理评价方案研究[J].长江科学院院报,2015,32(12):93-97.(Yang Yu,Zheng Zhiming. Research on evaluation scheme of soft foundation processing based on casebased reasoning[J]. Journal of the Yangtze River Academy of Sciences, 2015, 32(12):93-97.(in Chinese))
[10]朱建才,朱亦弘,王旭,等.杭州某软土超深基坑变形性状研究[J].地下空间与工程学报,2018,14(增1):335-341.(Zhu Jiancai,Zhu Yihong,Wang Xu,et al. Study on deformation behavior of a deep soft clay excavation in Hangzhou[J]. Chinese Journal of Underground Space and Engineering,2018,14(Supp.1):335-341.(in Chinese))
[11]左人宇,罗锦华,陆钊.深圳海积软土基于CU试验的修正剑桥模型[J].地下空间与工程学报,2016,12(3):646-655.(Zuo Renyu, Luo Jinhua, Chen Zhao. Modified Cam-Clay Model based on the cu test about marine soft soil in Shenzhen[J]. Chinese Journal of Underground Space and Engineering,2016,12(3):646-655.(in Chinese))
[12] Tang X W,Onitsuka K. Consolidation by vertical drains under time-dependent loading[J]. International Journal for Numerical and Analytical Methods in Geomechanics,2000,24(9):739-751.
[13]牛#,唐晓武,张超杰,等.竖井正方形地基固结度解答及其应用[J].中南大学学报(自然科学版),2017,48(5):1283-1292.(Niu Ben,Tang Xiaowu,Zhang Chaojie. Solution and application of vertical drain consolidation theory considering a square influence area[J]. Journal of Central South University(Science and Technology), 2017, 48(5):1283-1292.(in Chinese))
[14]李明飞.高速公路软土路基变形规律研宄[D].西安:西安科技大学,2006.(Li Mingfei. Study on the deformation laws of soft soil roadbed of highway[D].Xi’an:Xi’an University of Science and Technology,2006.(in Chinese))
[15]刘江波.海南滨海浜塘区软土固结特性分析[J].中外公路,2018,38(1):26-29.(Liu Jiangbo. Analysis of consolidation characteristics of soft soil in Qiangtang District,Hainan[J]. Chinese and foreign highways,2018,38(1):26-29.(in Chinese))
[16]周洺汉,商拥辉,徐林荣,等.高铁路基运营期沉降超限治理措施及效果评估[J].铁道标准设计,2017,61(12):28-34.(Zhou Minghan,Shang Yonghui,Xu Linrong. Control measures for settlement overrun of high-speed railwaysubgrade during operation period and effect evaluation[J]. Railway Standard Design,2017,61(12):28-34.(in Chinese))
[17]陈宏伟,徐林荣.高铁波浪状地形路基间过渡段沉降特性与控制效果[J].铁道科学与工程学报,2015,12(1):7-13.(Chen Hongwei,Xu Linrong.Study on settlement characteristics and control effect of high-speed railway transition section in wavy terrain subgrade[J]. Journal of Railway Science and Engineering,2015,12(1):7-13.(in Chinese))
[18]刘吉福,郑刚,龚晓南,等.柔性荷载刚性桩复合地基修正密度法稳定分析改进[J].岩土工程学报,2017,39(增2):33-36.(Liu Jifu,Zheng Gang,Gong Xiaonan,et al. Improvement of revised density method for stability analysis of rigid-pile composite foundation under flexible loads[J]. Chinese Journal of Geotechnical Engineering,2017,39(Supp. 2):33-36.(in Chinese))
[19]赵明华,牛浩懿,刘猛,等.柔性基础下碎石桩复合地基桩土应力比及沉降计算[J].岩土工程学报,2017,39(9):1549-1556.(Zhao Minghua,Niu Haoyi,Liu Meng. Pile-soil stress ratio and settlement of composite ground with gravel piles in flexible foundation[J]. Chinese Journal of Geotechnical Engineering,2017,39(9):1549-1556.(in Chinese))
[20]华永平.高压旋喷注浆工艺在桩基加固中的应用[J].公路交通技术, 2009(1):87-89.(Hua Yongping. Application of high pressure jet grouting technology in pile foundation reinforcement[J]. Road Traffic Technology,2009(1):87-89.(in Chinese))
[21]彭正勇.三重管旋喷注浆技术在隧道围岩加固中的应用[J].地下空间与工程学报,2010,6(6):1216-1255.(Peng Zhengyong. Application of triplex pipe jet grouting in tunnel wall rock reinforcement[J]. Chinese Journal of Underground Space and Engineering,2010,6(6):1216-1255.(in Chinese))
[22] Teoh Y P,Ing H W. A field trial of jet-grouting in marine clay[J]. Canadian Geotechnical Journal,2011,38(2):338-348.
[23]白中坤,杨朝帅,于少辉.正交试验法在旋喷桩参数试验中的应用[J].地下空间与工程学报,2014,10(3):624-629.(Bai Zhongkun,Yang Chaoshuai,Yu Shaohui. Application of orthogonal experiment to examination of rotation jet grouting pile parameters[J].Chinese Journal of Underground Space and Engineering,2014,10(3):624-629.(in Chinese))
[2]王晓峰.基于天然含水率海相淤泥质土的统计与分析以大连长兴岛葫芦山湾海域为例[J].工程地质学报, 2015, 23(1):97-103.(Wang Xiaofeng.Statistics and analysis of marine silty soil based on natural water content-a case study of Hulu mountain bay in Changxing Island,Dalian[J]. Journal of Engineering Geology,2015,23(1):97-103.(in Chinese))
[3]管健,张晶,上官子昌.海相淤泥质土力学参数的实验研究[J].价值工程,2013,32(24):86-88.(Guan Jian,Zhang Jing,Shang Guan Zichang. Experimental study of the mechanical parameter of marine ooze soil[J]. Value Engineering,2013,32(24):86-88.(in Chinese))
[4]柏叶辉,李向新,钟舒怡.深圳市1988-2018年海岸线时空演变分析[J].软件,2018,39(10):133-138.(Bai Yehui, Li Xiangxin, Zhong Shuyi. Dynamic change of the coastline in Shenzhen during 1988-2018[J]. Computer Engineering&Software, 2018, 39(10):133-138.(in Chinese))
[5]徐日庆,李雪刚.杭州海相软土的固化及其理论研究[D].杭州:浙江大学,2013.(Xu Riqing,Li Xuegang. Curing of marine soft soil in Hangzhou and its theoretical research[D]. Hangzhou:Zhejiang University,2013.(in Chinese))
[6]王文军,刘用海,朱向荣.宁波海相软土工程特性研究[J].工程勘察, 2008(10):19-24.(Wang Wunjun, Liu Yonghai, Zhu Xiangrong. Study on engineering characteristics of marine soft soil in[J].Engineering Investigation, 2008(10):19-24.(in Chinese))
[7]王明明,李忠雨,翟树起,等.天津滨海地区海相淤泥质软土基坑开挖及坑底加固技术[J].施工技术,2008,37(9):14-15.(Wang Mingming,Li Zhongyu,Zai Shuqi, et al. Excavation and pit bottom reinforcement technology of marine silt soft soil foundation in Tianjin Binhai Area[J]. Construction Technology,2008,37(9):14-15.(in Chinese))
[8]朱福,战高峰,佴磊.天然软土地基路堤临界高度一种计算方法研究[J].岩土力学,2013,34(6):1738-1744.(Zhu Fu, Zhan Gaofeng, Yi Lei. A calculation method for critical height of embankment on natural soft soil foundation[J]. Rack and Soil Mechanics,2013,34(6):1738-1744.(in Chinese))
[9]杨逾,郑志明.基于范例推理的软基处理评价方案研究[J].长江科学院院报,2015,32(12):93-97.(Yang Yu,Zheng Zhiming. Research on evaluation scheme of soft foundation processing based on casebased reasoning[J]. Journal of the Yangtze River Academy of Sciences, 2015, 32(12):93-97.(in Chinese))
[10]朱建才,朱亦弘,王旭,等.杭州某软土超深基坑变形性状研究[J].地下空间与工程学报,2018,14(增1):335-341.(Zhu Jiancai,Zhu Yihong,Wang Xu,et al. Study on deformation behavior of a deep soft clay excavation in Hangzhou[J]. Chinese Journal of Underground Space and Engineering,2018,14(Supp.1):335-341.(in Chinese))
[11]左人宇,罗锦华,陆钊.深圳海积软土基于CU试验的修正剑桥模型[J].地下空间与工程学报,2016,12(3):646-655.(Zuo Renyu, Luo Jinhua, Chen Zhao. Modified Cam-Clay Model based on the cu test about marine soft soil in Shenzhen[J]. Chinese Journal of Underground Space and Engineering,2016,12(3):646-655.(in Chinese))
[12] Tang X W,Onitsuka K. Consolidation by vertical drains under time-dependent loading[J]. International Journal for Numerical and Analytical Methods in Geomechanics,2000,24(9):739-751.
[13]牛#,唐晓武,张超杰,等.竖井正方形地基固结度解答及其应用[J].中南大学学报(自然科学版),2017,48(5):1283-1292.(Niu Ben,Tang Xiaowu,Zhang Chaojie. Solution and application of vertical drain consolidation theory considering a square influence area[J]. Journal of Central South University(Science and Technology), 2017, 48(5):1283-1292.(in Chinese))
[14]李明飞.高速公路软土路基变形规律研宄[D].西安:西安科技大学,2006.(Li Mingfei. Study on the deformation laws of soft soil roadbed of highway[D].Xi’an:Xi’an University of Science and Technology,2006.(in Chinese))
[15]刘江波.海南滨海浜塘区软土固结特性分析[J].中外公路,2018,38(1):26-29.(Liu Jiangbo. Analysis of consolidation characteristics of soft soil in Qiangtang District,Hainan[J]. Chinese and foreign highways,2018,38(1):26-29.(in Chinese))
[16]周洺汉,商拥辉,徐林荣,等.高铁路基运营期沉降超限治理措施及效果评估[J].铁道标准设计,2017,61(12):28-34.(Zhou Minghan,Shang Yonghui,Xu Linrong. Control measures for settlement overrun of high-speed railwaysubgrade during operation period and effect evaluation[J]. Railway Standard Design,2017,61(12):28-34.(in Chinese))
[17]陈宏伟,徐林荣.高铁波浪状地形路基间过渡段沉降特性与控制效果[J].铁道科学与工程学报,2015,12(1):7-13.(Chen Hongwei,Xu Linrong.Study on settlement characteristics and control effect of high-speed railway transition section in wavy terrain subgrade[J]. Journal of Railway Science and Engineering,2015,12(1):7-13.(in Chinese))
[18]刘吉福,郑刚,龚晓南,等.柔性荷载刚性桩复合地基修正密度法稳定分析改进[J].岩土工程学报,2017,39(增2):33-36.(Liu Jifu,Zheng Gang,Gong Xiaonan,et al. Improvement of revised density method for stability analysis of rigid-pile composite foundation under flexible loads[J]. Chinese Journal of Geotechnical Engineering,2017,39(Supp. 2):33-36.(in Chinese))
[19]赵明华,牛浩懿,刘猛,等.柔性基础下碎石桩复合地基桩土应力比及沉降计算[J].岩土工程学报,2017,39(9):1549-1556.(Zhao Minghua,Niu Haoyi,Liu Meng. Pile-soil stress ratio and settlement of composite ground with gravel piles in flexible foundation[J]. Chinese Journal of Geotechnical Engineering,2017,39(9):1549-1556.(in Chinese))
[20]华永平.高压旋喷注浆工艺在桩基加固中的应用[J].公路交通技术, 2009(1):87-89.(Hua Yongping. Application of high pressure jet grouting technology in pile foundation reinforcement[J]. Road Traffic Technology,2009(1):87-89.(in Chinese))
[21]彭正勇.三重管旋喷注浆技术在隧道围岩加固中的应用[J].地下空间与工程学报,2010,6(6):1216-1255.(Peng Zhengyong. Application of triplex pipe jet grouting in tunnel wall rock reinforcement[J]. Chinese Journal of Underground Space and Engineering,2010,6(6):1216-1255.(in Chinese))
[22] Teoh Y P,Ing H W. A field trial of jet-grouting in marine clay[J]. Canadian Geotechnical Journal,2011,38(2):338-348.
[23]白中坤,杨朝帅,于少辉.正交试验法在旋喷桩参数试验中的应用[J].地下空间与工程学报,2014,10(3):624-629.(Bai Zhongkun,Yang Chaoshuai,Yu Shaohui. Application of orthogonal experiment to examination of rotation jet grouting pile parameters[J].Chinese Journal of Underground Space and Engineering,2014,10(3):624-629.(in Chinese))