考虑地应力作用的嵌岩桩基础岩体完整性系数评价
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摘要
岩体完整性系数是桩基设计中评价岩体完整程度的重要指标之一。根据在建的济南恒大国际金融中心(总高518 m)嵌岩桩设计对岩体完整性评价的需求,在现场岩体纵波速度测试的基础上,开展了原位地应力(围压)条件下,桩端持力层深度岩块纵波速度测试,结果表明:强风化辉长岩(埋深69~80 m)的完整性系数为54.1%~58.8%,微风化辉长岩(埋深94~99 m)的完整性系数为77.2%~94.4%。随着风化程度的降低,地应力作用对岩体完整性系数的影响增强,考虑地应力作用下强风化地层的岩体完整性系数(均值)降低了2.1%,微风化地层的岩体完整性系数(均值)降低了5.2%。建议在超深嵌岩桩基础设计中,需考虑原位地应力对岩体完整性系数的影响。研究结果对嵌岩桩岩体完整性系数评价及超高层建筑地基勘察具有一定指导意义。
Rock mass integrity is one of the most important indicators for the evaluation of rock-socketed pile foundation. Based on the requirement and logging while drilling of Jinan Hengda International Financial Center which is being built( total altitude 518 m),the compressive wave velocities of typical gabbro cores were measured in the laboratory with different confining pressures. After that the rock mass integrity were computed. Compared with the compressive wave velocities without confining pressure,the rock mass integrities of the cores with confining pressure were more suitable for reflecting the real situation. The result shows that the fracture development,which is influenced by different degree of weathering,in the rock is the major influence factor of rock mass integrity. The rock mass integrity of highly weathered gabbro,whose depth is 69 ~ 80 m,is between 54. 1% and 58. 8%,while the weakly weathered gabbro,whose depth is 94 ~ 99 m,is from 77. 2% to 94. 4%. The mean value of rock mass integrity with confining pressure of highly weathered gabbro decreases 2. 1%,while the mean value of rock mass integrity with confining pressure of weakly weathered gabbro decreases 5. 2%. It should be considered for the influence of rock mass integrity with confining pressure in the design of super deep project in the future. The result of this paper will be useful and instructive for the rock-socketed pile and foundation investigation of super highrise building.
Rock mass integrity is one of the most important indicators for the evaluation of rock-socketed pile foundation. Based on the requirement and logging while drilling of Jinan Hengda International Financial Center which is being built( total altitude 518 m),the compressive wave velocities of typical gabbro cores were measured in the laboratory with different confining pressures. After that the rock mass integrity were computed. Compared with the compressive wave velocities without confining pressure,the rock mass integrities of the cores with confining pressure were more suitable for reflecting the real situation. The result shows that the fracture development,which is influenced by different degree of weathering,in the rock is the major influence factor of rock mass integrity. The rock mass integrity of highly weathered gabbro,whose depth is 69 ~ 80 m,is between 54. 1% and 58. 8%,while the weakly weathered gabbro,whose depth is 94 ~ 99 m,is from 77. 2% to 94. 4%. The mean value of rock mass integrity with confining pressure of highly weathered gabbro decreases 2. 1%,while the mean value of rock mass integrity with confining pressure of weakly weathered gabbro decreases 5. 2%. It should be considered for the influence of rock mass integrity with confining pressure in the design of super deep project in the future. The result of this paper will be useful and instructive for the rock-socketed pile and foundation investigation of super highrise building.
引文
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2中华人民共和国水利部.GB 50218-1994工程岩体分级标准.北京:中国计划出版社,1995The Ministry of Water Resources of the People's Republic of China.GB 50218-1994 standard for engineering classification of rock masses.Beijing:China Planning Press,1995
3陈辉.超高层建筑桩基础承载性能的试验研究与模拟分析.北京:中国地质科学院,2009Chen Hui.Experiment research and model analysis on bearing capacity of pile foundation of skyscraper.Beijing:Chinese Academy of Geological Sciences,2009
4史佩栋,梁晋渝.嵌岩桩竖向承载力的研究.岩土工程学报,1994;16(4):32-39Shi Peidong,Liang Jinyu.Vertical bearing capacity of rock-socketed piles.Chinese Journal of Geotechnical Engineering,1994;16(4):32-39
5乔二伟,龙长兴,马洪涛.不同孔隙流体下延长组砂岩波速各向异性的实验研究.地球物理学报,2014;57(6):1977-1989Qiao Erwei,Long Changxing,Ma Hongtao.An experimental study of P-and S-wave velocities anisotropy in sandstones filled with differential pore fluids from the Yanchang Formation.Chinese Journal of Geophysics(in Chinese),2014;57(6):1977-1989
6黄承贤,宋大卫.在围压下岩石弹性波速的研究.岩土工程学报,1991;13(2):32-41Huang Chengxian,Song Dawei.Study on elastic wave velocity of rock under confining pressure.Chinese Journal of Geotechnical Engineering,1991;13(2):32-41
7尹晓萌,晏鄂川,王闫超,等.水和围压下片岩变形各向异性及其应用研究.科学技术与工程,2017;17(8):37-44Yin Xiaomeng,Yan Echuang,Wang Yanchao,et al.Schist deformation anisotropy affected by water and confining pressure and its application.Science Technology and Engineering,2017;17(8):37-44
8郭彬彬,王红才,赵卫华,等.云南高黎贡山典型板岩地震波各向异性研究.地球物理学报,2014;57(3):837-846Guo Binbin,Wang Hongcai,Zhao Weihua,et al.Analysis of seismic anisotropy of shale and its application of shale.Chinese Journal of Geophysics(in Chinese),2014;57(3):837-846
9郑贵平,赵兴东,刘建坡,等.岩石加载过程声波波速变化规律实验研究.东北大学学报(自然科学版),2009;30(8):1197-1200Zheng Guiping,Zhao Xingdong,Liu Jianpo,et al.Experimental study on change in acoustic wave velocitywhen rock is loading.Journal of Northeastern University(Natural Science),2009;30(8):1197-1200
10赵冬,丁文龙,梅永贵,等.三轴条件下不同岩性岩石动静态力学参数特征试验分析.科学技术与工程,2015;15(19):58-63Zhao Dong,Ding Wenlong,Mei Yonggui,et al.Test analysis of rock dynamic and static mechanical parameters characteristics of different rock lithology under triaxial condition.Science Technology and Engineering,2015;15(19):58-63
11施行觉,孙道远.循环应力作用下松散介质的波速和衰减特性.岩土工程学报,2001;23(1):114-116Shi Xingjue,Sun Daoyuan.Wave velocity and attenuation in the incompact medium under cyclic stress.Chinese Journal of Geotechnical Engineering,2001;23(1):114-116
12未晛,王尚旭,赵建国,等.含流体砂岩地震波频散实验研究.地球物理学报,2015;58(9):3380-3388Wei Xian,Wang Shangxu,Zhao Jianguo,et al.Laboratory study of velocity dispersion of the seismic wave in fluid-saturated sandstones.Chinese Journal of Geophysics(in Chinese),2015;58(9):3380-3388
13赵明阶.二维应力场作用下岩体弹性波速与衰减特性研究.岩石力学与工程学报,2007;26(1):123-130Zhao Mingjie.Study on wave velocity and attenuation of rock mass in 2D stresses field.Chinese Journal of Rock Mechanics and Engineering,2007;26(1):123-130
14李跃刚,王文举,万单夫,等.应力敏感对致密砂岩气藏气水两相渗流特征影响研究.科学技术与工程,2017;17(3):69-73Li Yuegang,Wang Wenju,Wan Danfu,et al.Effect of stress sensitivity on characteristics of gas water two-phase flow in tight sandstone gas reservoir.Science Technology and Engineering,2017;17(3):69-73
15郭强,葛修润,车爱兰.岩体完整性指数与弹性模量之间的关系研究.岩石力学与工程学报,2011;30(增刊2):3914-3919Guo Qiang,Ge Xiurun,Che Ailan.Research on relationship of rock mass integrity index and rock mass elastic modulus.Chinese Journal of Rock Mechanics and Engineering,2011;30(S2):3914-3919
16陈祥,孙进忠,张杰坤,等.岩块卸荷效应与工程岩体质量评价.土木建筑与环境工程,2009;31(6):53-59Chen Xiang,Sun Jinzhong,Zhang Jiekun,et al.The unloading effect of rock samples and the quality evaluation of engineering rock masses.Journal of Civil,Architectural&Environmental Engineering,2009;31(6):53-59
17李晓昭,安英杰,俞缙,等.岩芯卸荷扰动的声学反应与卸荷敏感岩体.岩石力学与工程学报,2003;22(12):2086-2092Li Xiaozhao,An Yingjie,Yu Jin,et al.Acoustic responses to rock core unloading-disturbance and unloading-sensitive rock mass.Chinese Journal of Rock Mechanics and Engineering,2003;22(12):2086-2092
18宋明春.山东省大地构造格局和地质构造演化.北京:中国地质科学院,2008Song Mingchun.Tectonic framework and tectonic evolution of the Shandong province.Beijing:Chinese Academy of Geological Sciences,2008
19中华人民共和国建设部.岩土工程勘察规范:GB 50021-2001.北京:中国建筑工业出版社,2002Ministry of Construction of the People's Republic of China.Code for investigation of geotechnical engineering:GB 50021-2001.Beijing:China Architecture&Building Press,2002
20段铁梁.世纪地球物理公司(CGC)数字测井仪简介.测井技术,1987;11(1):53-59Duan Tieliang.Brief introduction of digital logging recorder from century geophysical company.Well Logging Technology,1987;11(1):53-59
21 Jones L,Wang H F.Ultrasonic velocities in Cretaceous shales from the Williston basin.Geophysics,1981;46(3):288-297
22 Hornby B E.Experimental laboratory determination of the dynamic elasitic properties of wet,drained shales.Journal of Geophysical Research,1998;103(B12):29945-29964
23杨树新.中国陆域地壳应力场分布特征研究.北京:北京交通大学,2013Yang Shuxin.Study on the distribution characteristics of crustal stress field in Chinese mainland.Beijing:Beijing Jiaotong University,2013
24王鹏程,陈筠,季永新,等.贵州软质较破碎白云岩嵌岩桩竖向承载力分析.科学技术与工程,2016;16(9):253-258Wang Pengcheng,Chen Jun,Ji Yongxin,et al.Analysis for the vertical bearing capacity of single pile for rock-socketed pile of the broken soft dolomite in Guizhou.Science Technology and Engineering,2016;16(9):253-258
25吴成,张平.高地应力硬岩洞室开挖破坏区数值模拟方法探讨.水文地质工程地质,2012;39(6):35-42Wu Cheng,Zhang Ping.Analysis of numerical simulation methods for excavation failure zone of deep underground opening in hard rocks with high geostress.Hydrogeology&Engineering Geology,2012;39(6):35-42
26乔二伟,赵卫华,龙长兴.含不同孔隙流体的砂岩地震波速度随压力变化的实验研究.地球物理学报,2012;55(12):4257-4265Qiao Erwei,Zhao Weihua,Long Changxing.A laboratory study of seismic wave velocity in sandstone bearing differential pore fluids at different pressures.Chinese Journal of Geophysics(in Chinese),2012;55(12):4257-4265
27张风达,申宝宏,康永华.考虑卸荷作用的底板突水破坏机制研究.岩土力学,2016;37(2):431-438Zhang Fengda,Shen Baohong,Kang Yonghua.Water inrush failure mechanism of mining floor under unloading effect.Rock and Soil Mechanics,2016;37(2):431-438
28王田龙,黄质宏,张飞,等.基于自平衡法的较破碎岩石地基嵌岩桩承载性状研究.贵州大学学报(自然科学版),2015;32(5):126-129Wang Tianlong,Huang Zhihong,Zhang Fei,et al.The study of rock-socketed segment piles'bearing behavior on less cracked rock foundation under self-balanced method.Journal of Guizhou University(Natural Sciences),2015;32(5):126-129
2中华人民共和国水利部.GB 50218-1994工程岩体分级标准.北京:中国计划出版社,1995The Ministry of Water Resources of the People's Republic of China.GB 50218-1994 standard for engineering classification of rock masses.Beijing:China Planning Press,1995
3陈辉.超高层建筑桩基础承载性能的试验研究与模拟分析.北京:中国地质科学院,2009Chen Hui.Experiment research and model analysis on bearing capacity of pile foundation of skyscraper.Beijing:Chinese Academy of Geological Sciences,2009
4史佩栋,梁晋渝.嵌岩桩竖向承载力的研究.岩土工程学报,1994;16(4):32-39Shi Peidong,Liang Jinyu.Vertical bearing capacity of rock-socketed piles.Chinese Journal of Geotechnical Engineering,1994;16(4):32-39
5乔二伟,龙长兴,马洪涛.不同孔隙流体下延长组砂岩波速各向异性的实验研究.地球物理学报,2014;57(6):1977-1989Qiao Erwei,Long Changxing,Ma Hongtao.An experimental study of P-and S-wave velocities anisotropy in sandstones filled with differential pore fluids from the Yanchang Formation.Chinese Journal of Geophysics(in Chinese),2014;57(6):1977-1989
6黄承贤,宋大卫.在围压下岩石弹性波速的研究.岩土工程学报,1991;13(2):32-41Huang Chengxian,Song Dawei.Study on elastic wave velocity of rock under confining pressure.Chinese Journal of Geotechnical Engineering,1991;13(2):32-41
7尹晓萌,晏鄂川,王闫超,等.水和围压下片岩变形各向异性及其应用研究.科学技术与工程,2017;17(8):37-44Yin Xiaomeng,Yan Echuang,Wang Yanchao,et al.Schist deformation anisotropy affected by water and confining pressure and its application.Science Technology and Engineering,2017;17(8):37-44
8郭彬彬,王红才,赵卫华,等.云南高黎贡山典型板岩地震波各向异性研究.地球物理学报,2014;57(3):837-846Guo Binbin,Wang Hongcai,Zhao Weihua,et al.Analysis of seismic anisotropy of shale and its application of shale.Chinese Journal of Geophysics(in Chinese),2014;57(3):837-846
9郑贵平,赵兴东,刘建坡,等.岩石加载过程声波波速变化规律实验研究.东北大学学报(自然科学版),2009;30(8):1197-1200Zheng Guiping,Zhao Xingdong,Liu Jianpo,et al.Experimental study on change in acoustic wave velocitywhen rock is loading.Journal of Northeastern University(Natural Science),2009;30(8):1197-1200
10赵冬,丁文龙,梅永贵,等.三轴条件下不同岩性岩石动静态力学参数特征试验分析.科学技术与工程,2015;15(19):58-63Zhao Dong,Ding Wenlong,Mei Yonggui,et al.Test analysis of rock dynamic and static mechanical parameters characteristics of different rock lithology under triaxial condition.Science Technology and Engineering,2015;15(19):58-63
11施行觉,孙道远.循环应力作用下松散介质的波速和衰减特性.岩土工程学报,2001;23(1):114-116Shi Xingjue,Sun Daoyuan.Wave velocity and attenuation in the incompact medium under cyclic stress.Chinese Journal of Geotechnical Engineering,2001;23(1):114-116
12未晛,王尚旭,赵建国,等.含流体砂岩地震波频散实验研究.地球物理学报,2015;58(9):3380-3388Wei Xian,Wang Shangxu,Zhao Jianguo,et al.Laboratory study of velocity dispersion of the seismic wave in fluid-saturated sandstones.Chinese Journal of Geophysics(in Chinese),2015;58(9):3380-3388
13赵明阶.二维应力场作用下岩体弹性波速与衰减特性研究.岩石力学与工程学报,2007;26(1):123-130Zhao Mingjie.Study on wave velocity and attenuation of rock mass in 2D stresses field.Chinese Journal of Rock Mechanics and Engineering,2007;26(1):123-130
14李跃刚,王文举,万单夫,等.应力敏感对致密砂岩气藏气水两相渗流特征影响研究.科学技术与工程,2017;17(3):69-73Li Yuegang,Wang Wenju,Wan Danfu,et al.Effect of stress sensitivity on characteristics of gas water two-phase flow in tight sandstone gas reservoir.Science Technology and Engineering,2017;17(3):69-73
15郭强,葛修润,车爱兰.岩体完整性指数与弹性模量之间的关系研究.岩石力学与工程学报,2011;30(增刊2):3914-3919Guo Qiang,Ge Xiurun,Che Ailan.Research on relationship of rock mass integrity index and rock mass elastic modulus.Chinese Journal of Rock Mechanics and Engineering,2011;30(S2):3914-3919
16陈祥,孙进忠,张杰坤,等.岩块卸荷效应与工程岩体质量评价.土木建筑与环境工程,2009;31(6):53-59Chen Xiang,Sun Jinzhong,Zhang Jiekun,et al.The unloading effect of rock samples and the quality evaluation of engineering rock masses.Journal of Civil,Architectural&Environmental Engineering,2009;31(6):53-59
17李晓昭,安英杰,俞缙,等.岩芯卸荷扰动的声学反应与卸荷敏感岩体.岩石力学与工程学报,2003;22(12):2086-2092Li Xiaozhao,An Yingjie,Yu Jin,et al.Acoustic responses to rock core unloading-disturbance and unloading-sensitive rock mass.Chinese Journal of Rock Mechanics and Engineering,2003;22(12):2086-2092
18宋明春.山东省大地构造格局和地质构造演化.北京:中国地质科学院,2008Song Mingchun.Tectonic framework and tectonic evolution of the Shandong province.Beijing:Chinese Academy of Geological Sciences,2008
19中华人民共和国建设部.岩土工程勘察规范:GB 50021-2001.北京:中国建筑工业出版社,2002Ministry of Construction of the People's Republic of China.Code for investigation of geotechnical engineering:GB 50021-2001.Beijing:China Architecture&Building Press,2002
20段铁梁.世纪地球物理公司(CGC)数字测井仪简介.测井技术,1987;11(1):53-59Duan Tieliang.Brief introduction of digital logging recorder from century geophysical company.Well Logging Technology,1987;11(1):53-59
21 Jones L,Wang H F.Ultrasonic velocities in Cretaceous shales from the Williston basin.Geophysics,1981;46(3):288-297
22 Hornby B E.Experimental laboratory determination of the dynamic elasitic properties of wet,drained shales.Journal of Geophysical Research,1998;103(B12):29945-29964
23杨树新.中国陆域地壳应力场分布特征研究.北京:北京交通大学,2013Yang Shuxin.Study on the distribution characteristics of crustal stress field in Chinese mainland.Beijing:Beijing Jiaotong University,2013
24王鹏程,陈筠,季永新,等.贵州软质较破碎白云岩嵌岩桩竖向承载力分析.科学技术与工程,2016;16(9):253-258Wang Pengcheng,Chen Jun,Ji Yongxin,et al.Analysis for the vertical bearing capacity of single pile for rock-socketed pile of the broken soft dolomite in Guizhou.Science Technology and Engineering,2016;16(9):253-258
25吴成,张平.高地应力硬岩洞室开挖破坏区数值模拟方法探讨.水文地质工程地质,2012;39(6):35-42Wu Cheng,Zhang Ping.Analysis of numerical simulation methods for excavation failure zone of deep underground opening in hard rocks with high geostress.Hydrogeology&Engineering Geology,2012;39(6):35-42
26乔二伟,赵卫华,龙长兴.含不同孔隙流体的砂岩地震波速度随压力变化的实验研究.地球物理学报,2012;55(12):4257-4265Qiao Erwei,Zhao Weihua,Long Changxing.A laboratory study of seismic wave velocity in sandstone bearing differential pore fluids at different pressures.Chinese Journal of Geophysics(in Chinese),2012;55(12):4257-4265
27张风达,申宝宏,康永华.考虑卸荷作用的底板突水破坏机制研究.岩土力学,2016;37(2):431-438Zhang Fengda,Shen Baohong,Kang Yonghua.Water inrush failure mechanism of mining floor under unloading effect.Rock and Soil Mechanics,2016;37(2):431-438
28王田龙,黄质宏,张飞,等.基于自平衡法的较破碎岩石地基嵌岩桩承载性状研究.贵州大学学报(自然科学版),2015;32(5):126-129Wang Tianlong,Huang Zhihong,Zhang Fei,et al.The study of rock-socketed segment piles'bearing behavior on less cracked rock foundation under self-balanced method.Journal of Guizhou University(Natural Sciences),2015;32(5):126-129