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The inlet cofferdam of the expansion engineering of Wuqiangxi hydropower station consists of the reserved rock barrier, concrete, soil and stones. The rock barrier is a bedding slope with relatively developed soft interlayers, which results in a complicated geological condition and blasting demolition environment for the cofferdam. In the process of demolishing the bedding rock barrier, it is impossible to break the rock once in a large area according to the economic section of a conventional cofferdam due to the large engineering quantity of the underwater blasting excavation, high requirement of fragmentation, long construction time and high risk. Under the condition of ensuring the stability of the cofferdam, the method of vertical stratification, horizontal zoning and loosening bench blasting was adopted to implement land excavation as much as possible. For the underwater blasting, according to the geological conditions of rock barrier, the mechanical characteristics of rock mass, the water depth (20~37 m) and the fragmentation requirement, the powder factor of 0.9~1.1 kg/m3 and maximum charge per delay of 60 kg was adopted. Electronic detonators were used for blast hole initiation and a series of safety measures such as bubble curtains and flexible protective nets were set. The field monitoring results show that the effect of blasting vibration and water percussive wave on structures such as inlet gate has been effectively controlled, and the efficiency of underwater slag removal and transfer has been improved.
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五强溪水电站扩机工程进水口围堰采用预留岩坎+混凝土围堰+土石子围堰的组合结构形式,堰内岩坎为顺层坡,软弱夹层较发育,围堰爆破拆除环境和地质条件复杂。顺层岩坎拆除时无法按常规围堰的经济断面进行大范围削方和一次拆除,深水水下爆破开挖工程量大、块度要求高、施工时间长、安全风险高。爆破拆除过程中在保证围堰稳定的条件下,采取垂向分层、水平向分区、台阶松动爆破的施工方法,尽可能多地实施陆上开挖。水下爆破根据岩坎地质条件、岩体力学特性及覆盖水深(20~37 m),结合水下爆破清渣块度要求,采用0.9~1.1 kg/m3的炸药单耗。通过数码电子雷管高精度延时起爆技术,严格控制单段最大药量(60 kg以内),并设置气泡帷幕和柔性防护网等一系列安全防护措施。经现场爆破监测结果表明:爆破振动及水击波对进水口闸门等建构筑物的影响得到了有效控制,提高了水下清渣、转运效率得到了提高。
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17(3): 53-57., articleTitle=溪洛渡水电站导流洞围堰爆破技术及效果分析, refAbstract=null), Reference(id=1241089952717533335, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2011, volume=17, issue=3, pageStart=53, pageEnd=57, url=null, language=null, rfNumber=[8], rfOrder=12, authorNames=LI Jin-he, LIU Mei-shan, journalName=Engineering Blasting, refType=null, unstructuredReference=
LI Jin-he,
LIU Mei-shan. Blasting demolition technology and effect analysis of the diversion tunnel cofferdam in Xi-LuoDu hydropower station[J].
Engineering Blasting,
2011,
17(3): 53-57. (in Chinese), articleTitle=Blasting demolition technology and effect analysis of the diversion tunnel cofferdam in Xi-LuoDu hydropower station, refAbstract=null), Reference(id=1241089952834973848, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2008, volume=14, issue=4, pageStart=76, pageEnd=81, url=null, language=null, rfNumber=[9], rfOrder=13, authorNames=张文煊, 刘美山, journalName=工程爆破, refType=null, unstructuredReference=张文煊, 刘美山. 大型水电站围堰及岩坎爆破拆除中的安全防护问题研究[J].
工程爆破,
2008,
14(4): 76-81., articleTitle=大型水电站围堰及岩坎爆破拆除中的安全防护问题研究, refAbstract=null), Reference(id=1241089952973385888, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2008, volume=14, issue=4, pageStart=76, pageEnd=81, url=null, language=null, rfNumber=[9], rfOrder=14, authorNames=ZHANG Wen-xuan, LIU Mei-shan, journalName=Engineering Blasting, refType=null, unstructuredReference=
ZHANG Wen-xuan,
LIU Mei-shan. Research on safety protection problems in blasting demolition of cofferdam and rock ridge of large hydropower station[J].
Engineering Blasting,
2008,
14(4): 76-81. (in Chinese), articleTitle=Research on safety protection problems in blasting demolition of cofferdam and rock ridge of large hydropower station, refAbstract=null), Reference(id=1241089953090826407, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2017, volume=34, issue=1, pageStart=108, pageEnd=112, url=null, language=null, rfNumber=[10], rfOrder=15, authorNames=王红彬, 王霄, journalName=爆破, refType=null, unstructuredReference=王红彬, 王霄. 白鹤滩水电站左岸导流洞围堰拆除技术研究[J].
爆破,
2017,
34(1): 108-112., articleTitle=白鹤滩水电站左岸导流洞围堰拆除技术研究, refAbstract=null), Reference(id=1241089953220849839, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2017, volume=34, issue=1, pageStart=108, pageEnd=112, url=null, language=null, rfNumber=[10], rfOrder=16, authorNames=WANG Hong-bin, WANG Xiao, journalName=Blasting, refType=null, unstructuredReference=
WANG Hong-bin,
WANG Xiao. Explosive demolition technology analysis of diversion tunnel cofferdam at left bank in Baihetan hydropower station[J].
Blasting,
2017,
34(1): 108-112. (in Chinese), articleTitle=Explosive demolition technology analysis of diversion tunnel cofferdam at left bank in Baihetan hydropower station, refAbstract=null), Reference(id=1241089953329901750, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2012, volume=29, issue=1, pageStart=19, pageEnd=22, url=null, language=null, rfNumber=[11], rfOrder=17, authorNames=柴修伟, 梁开水, journalName=爆破, refType=null, unstructuredReference=柴修伟, 梁开水. 水下炮孔爆破不同方向的水中冲击波传播特性研究[J].
爆破,
2012,
29(1): 19-22., articleTitle=水下炮孔爆破不同方向的水中冲击波传播特性研究, refAbstract=null), Reference(id=1241089954877599935, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, doi=null, pmid=null, pmcid=null, year=2012, volume=29, issue=1, pageStart=19, pageEnd=22, url=null, language=null, rfNumber=[11], rfOrder=18, authorNames=CHAI Xiu-Wei, LIANG Kai-shui, journalName=Blasting, refType=null, unstructuredReference=
CHAI Xiu-Wei,
LIANG Kai-shui. Research on propagation characteristic of water shock wave induced by underwater drilling blasting in different direction[J].
Blasting,
2012,
29(1): 19-22. (in Chinese), articleTitle=Research on propagation characteristic of water shock wave induced by underwater drilling blasting in different direction, refAbstract=null)], funds=[Fund(id=1241089951148863510, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, awardId=51374163, language=CN, fundingSource=国家自然科学基金面上项目(51374163), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241089943288738370, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, xref=1., ext=[AuthorCompanyExt(id=1241089943297126980, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, companyId=1241089943288738370, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1.China Gezhouba Group No.1 Engineering Co., Ltd., Yichang 443002, China), AuthorCompanyExt(id=1241089943301321285, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, companyId=1241089943288738370, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1.中国葛洲坝集团 第一有限公司,宜昌 443002)]), AuthorCompany(id=1241089943422956111, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, xref=2., ext=[AuthorCompanyExt(id=1241089943431344720, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, companyId=1241089943422956111, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2.武汉理工大学 土木工程与建筑学院,武汉 430070)])], figs=[ArticleFig(id=1241089947185247007, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Fig. 1, caption=
Structure of the cofferdam at the water inlet, figureFileSmall=qfYjRildVB23GWoJsMvPcw==, figureFileBig=MXnaUZPZN0EofmcQu6ga8w==, tableContent=null), ArticleFig(id=1241089947277521705, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=图1, caption=
进水口围堰结构, figureFileSmall=qfYjRildVB23GWoJsMvPcw==, figureFileBig=MXnaUZPZN0EofmcQu6ga8w==, tableContent=null), ArticleFig(id=1241089947571123016, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Fig. 2, caption=
Schematic diagram of cofferdam demolition (unit: m), figureFileSmall=/UCGtfKz/JcIpqz1Uc2jXQ==, figureFileBig=3lYNs3llMQKXBjtEC59l2Q==, tableContent=null), ArticleFig(id=1241089947713729356, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=图2, caption=
围堰拆除分区示意图(单位:m), figureFileSmall=/UCGtfKz/JcIpqz1Uc2jXQ==, figureFileBig=3lYNs3llMQKXBjtEC59l2Q==, tableContent=null), ArticleFig(id=1241089947835364186, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Fig. 3, caption=
Removal effect of concrete and rock barrier, figureFileSmall=Hzt66ZpSfSNZRWtegF3TQA==, figureFileBig=4ZIwzRMDle0S3m61lYZPgQ==, tableContent=null), ArticleFig(id=1241089947965387623, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=图3, caption=
混凝土及岩坎削薄效果, figureFileSmall=Hzt66ZpSfSNZRWtegF3TQA==, figureFileBig=4ZIwzRMDle0S3m61lYZPgQ==, tableContent=null), ArticleFig(id=1241089948099605363, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Fig. 4, caption=
Underwater initiation network, figureFileSmall=GsfQyFZTLfEYWmizyjRjJA==, figureFileBig=JiyBeFQ8cqCbjb+XfUKO/w==, tableContent=null), ArticleFig(id=1241089948221240195, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=图4, caption=
水下爆破网路图, figureFileSmall=GsfQyFZTLfEYWmizyjRjJA==, figureFileBig=JiyBeFQ8cqCbjb+XfUKO/w==, tableContent=null), ArticleFig(id=1241089948321903501, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Fig. 5, caption=
The effect of underwater blasting, figureFileSmall=Y8Z2lE7XdkKpZkUwE+bwew==, figureFileBig=us1hQc0Ty72etor/Td3NMw==, tableContent=null), ArticleFig(id=1241089948405789588, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=图5, caption=
水下爆破效果, figureFileSmall=Y8Z2lE7XdkKpZkUwE+bwew==, figureFileBig=us1hQc0Ty72etor/Td3NMw==, tableContent=null), ArticleFig(id=1241089948519035811, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Fig. 6, caption=
Layout of monitoring points (unit: m), figureFileSmall=oeJde79WGOkyrxhcKaXyIA==, figureFileBig=iTr5iryEsTeEpDooDTQRjw==, tableContent=null), ArticleFig(id=1241089948607116207, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=图6, caption=
监测点布置图(单位:m), figureFileSmall=oeJde79WGOkyrxhcKaXyIA==, figureFileBig=iTr5iryEsTeEpDooDTQRjw==, tableContent=null), ArticleFig(id=1241089948720362423, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Table 1, caption=
Blasting parameters of concrete in zone 1
, figureFileSmall=null, figureFileBig=null, tableContent=
| 台阶高度H/m | 孔径ϕ/mm | 药卷直径/mm | 孔距a/m | 排距b/m | 孔深度L/m | 堵塞长度/m | 炸药单耗/(kg·m-3) | 单孔药量Q/kg |
|---|
| 4 m(上层) | 42 | 32 | 1.5 | 1.0 | 4.5 | 1.0 | 0.35 | 2.1 |
| 6 m(下层) | 90 | 70 | 3.0 | 2.5 | 6.5 | 1.5 | 0.35 | 16.0 |
), ArticleFig(id=1241089948833608642, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=表1, caption=
1区混凝土爆破参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 台阶高度H/m | 孔径ϕ/mm | 药卷直径/mm | 孔距a/m | 排距b/m | 孔深度L/m | 堵塞长度/m | 炸药单耗/(kg·m-3) | 单孔药量Q/kg |
|---|
| 4 m(上层) | 42 | 32 | 1.5 | 1.0 | 4.5 | 1.0 | 0.35 | 2.1 |
| 6 m(下层) | 90 | 70 | 3.0 | 2.5 | 6.5 | 1.5 | 0.35 | 16.0 |
), ArticleFig(id=1241089950372918221, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Table 2, caption=
Bench blasting parameters of zone 2
, figureFileSmall=null, figureFileBig=null, tableContent=
| 台阶高度H/m | 孔径ϕ/mm | 药卷直径/mm | 孔距a/m | 排距b/m | 孔深度L/m | 堵塞长度/m | 炸药单耗/(kg·m-3) | 单孔药量Q/kg |
|---|
| 6~10 m | 90 | 70 | 3~3.5 | 2~3.0 | 7~11 | 1.5~2.5 | 0.35 | 16~37 |
), ArticleFig(id=1241089950477775831, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=表2, caption=
2区台阶爆破参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 台阶高度H/m | 孔径ϕ/mm | 药卷直径/mm | 孔距a/m | 排距b/m | 孔深度L/m | 堵塞长度/m | 炸药单耗/(kg·m-3) | 单孔药量Q/kg |
|---|
| 6~10 m | 90 | 70 | 3~3.5 | 2~3.0 | 7~11 | 1.5~2.5 | 0.35 | 16~37 |
), ArticleFig(id=1241089950582633445, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Table 3, caption=
Underwater blasting parameters of the rock barrier
, figureFileSmall=null, figureFileBig=null, tableContent=
| 水深H/m | 孔径ϕ/mm | 孔距a/m | 排距b/m | 孔深度L/m | 堵塞长度/m | 炸药单耗/(kg·m-3) | 单孔最大药量Q/kg |
|---|
| <18 m | 115 | 2.0 | 2.0 | 5~7 | 0.5 | 0.9 | 27 |
| >18 m | 115 | 2.0 | 2.0 | 7~13 | 1.0 | 1.1 | 57 |
), ArticleFig(id=1241089950721045492, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=表3, caption=
岩坎水下爆破参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 水深H/m | 孔径ϕ/mm | 孔距a/m | 排距b/m | 孔深度L/m | 堵塞长度/m | 炸药单耗/(kg·m-3) | 单孔最大药量Q/kg |
|---|
| <18 m | 115 | 2.0 | 2.0 | 5~7 | 0.5 | 0.9 | 27 |
| >18 m | 115 | 2.0 | 2.0 | 7~13 | 1.0 | 1.1 | 57 |
), ArticleFig(id=1241089950872040443, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=EN, label=Table 4, caption=
Monitoring results of underwater blasting vibration and water percussive wave
, figureFileSmall=null, figureFileBig=null, tableContent=
| 测次 | 药量/kg | 质点振动速度/(cm·s-1) | 水击波/MPa |
|---|
| 单段最大药量 | 总药量 | 民房 | 大坝 | GIS室 | 进水口闸门 | 大坝拦污栅(2#/3#机组) |
|---|
| 距离/m | 实测值 | 距离/m | 实测值 |
|---|
| 1 | 38.4 | 1067 | 0.82 | 0.19 | 0.28 | 220 | <0.0067 | | |
| 2 | 36.8 | 433 | 0.52 | 0.13 | 0.19 | 60 | 0.1079 | 150 | <0.0067 |
| 3 | 56.0 | 360 | 0.45 | 0.11 | 0.14 | 60 | 0.0708 | 163 | 0.0045 |
), ArticleFig(id=1241089951018840071, tenantId=1146029695717560320, journalId=1240670690148397066, articleId=1241089939606139272, language=CN, label=表4, caption=
水下爆破振动及水击波监测结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 测次 | 药量/kg | 质点振动速度/(cm·s-1) | 水击波/MPa |
|---|
| 单段最大药量 | 总药量 | 民房 | 大坝 | GIS室 | 进水口闸门 | 大坝拦污栅(2#/3#机组) |
|---|
| 距离/m | 实测值 | 距离/m | 实测值 |
|---|
| 1 | 38.4 | 1067 | 0.82 | 0.19 | 0.28 | 220 | <0.0067 | | |
| 2 | 36.8 | 433 | 0.52 | 0.13 | 0.19 | 60 | 0.1079 | 150 | <0.0067 |
| 3 | 56.0 | 360 | 0.45 | 0.11 | 0.14 | 60 | 0.0708 | 163 | 0.0045 |
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