城市复杂环境深大岩质基坑施工技术
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摘要
以某交通枢纽综合体超大超深岩质基坑工程为背景,阐述基坑工程分期、分区施工的组织方案;给出精细化控制爆破设计施工参数(主要包括开挖方式、施工分区、爆破顺序、孔网参数、装药参数及爆破网络设计等);形成板肋式锚杆挡墙的逆作法施工技术,并重点论述了大直径多杆体超长锚杆结构参数和施工关键技术。研究表明:所采用的超大超深岩质基坑工程分期、分区施工组织方案,提高了土石方开挖和基坑支护的效率;采用的数码电子雷管精细化控制爆破技术,可将周边高层建筑物和地下结构的爆破振动速率控制在1. 0 cm/s以内;板肋式锚杆挡墙逆作法施工技术可有效控制邻近建筑物的沉降和倾斜变形。
This paper is based on a super large and deep rock foundation pit in a traffic hub complex,expounding the organization plan of foundation pit construction by stages and zones; giving the design and construction parametersof finecontrol blasting( mainly including excavation pattern,construction division,blasting sequence,hole network parameters,charging parameters and blasting network design,etc.); forming the reverse construction technique of platelux typeanchor retaining wall,and emphatically discussingthe structural parameters and key construction techniques of large-diameter multi-bar super-long bolt. Research shows that the staging and zoning construction organization planused in thesuper largeand deep rock foundation pit engineering improves the efficiency of earth-rock excavation and foundation pit support; with the using of digital electronic detonator fine control blasting technology,the blasting vibration of the surrounding high-rise buildings and underground structures is obviously controlled within 1. 0 cm/s; the reverse construction technology of plate-lux type anchor retaining wall can effectively control the settlement and inclination deformation of adjacent buildings.
This paper is based on a super large and deep rock foundation pit in a traffic hub complex,expounding the organization plan of foundation pit construction by stages and zones; giving the design and construction parametersof finecontrol blasting( mainly including excavation pattern,construction division,blasting sequence,hole network parameters,charging parameters and blasting network design,etc.); forming the reverse construction technique of platelux typeanchor retaining wall,and emphatically discussingthe structural parameters and key construction techniques of large-diameter multi-bar super-long bolt. Research shows that the staging and zoning construction organization planused in thesuper largeand deep rock foundation pit engineering improves the efficiency of earth-rock excavation and foundation pit support; with the using of digital electronic detonator fine control blasting technology,the blasting vibration of the surrounding high-rise buildings and underground structures is obviously controlled within 1. 0 cm/s; the reverse construction technology of plate-lux type anchor retaining wall can effectively control the settlement and inclination deformation of adjacent buildings.
引文
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[11]韩健勇,赵文,贾鹏蛟,等.桩锚支护结构深基坑受力变形及稳定性分析[J].地下空间与工程学报,2017,13(S2):907-914.
[12]王卫东,徐中华.基坑工程技术新进展与展望[J].施工技术,2018,47(6):53-65.
[13]王国富,刘凤洲,王丹,等.紧邻高层结构深基坑支护方案优化分析-以济南地铁R3线龙洞庄车站基坑为例[J].隧道建设,2017,37(6):708-716.
[14]刘露,王贵珍,刘志永,等.逆作法在南坪交通枢纽工程基坑支护中的应用[J].重庆建筑,2010(9):45-48.
[15]张玉成,杨光华,胡海英,等.多种支护型式在超大深基坑工程设计中的组合应用[J].岩土工程学报,2014,36(S2):198-204.
[16]王永玮,逄文慧.深基坑工程风险评价分析[J].施工技术,2017,46(S2):330-334.
[2]熊祖钊,易流,黄小武,等.城市复杂环境下基坑土石方爆破振动控制研究[J].爆破,2016,33(1):45-49.
[3]张文虎,魏束强.天然气管线附近石方爆破的工程实践[J].工程爆破,20009,15(3):46-47,66.
[4]费鸿禄,王振达,蒋安俊,等.地铁隧道爆破振动对地面的影响规律研究[J].爆破,2018,35(3):68-73.
[5]何理,钟冬望,司剑峰.临近边坡毫秒延时爆破合理延时时间试验[J].工程爆破,2016,22(1):8-13,29.
[6]王璞,陈志刚,张道振,等.市区复杂环境下深基坑开挖控制爆破[J].工程爆破,2010,16(1):35-39.
[7]王薇,邹江海,尹俊涛,等.江州深基坑下伏基岩爆破开挖危害控制研究[J].安全与环境学报,2016,16(3):94-99.
[8]徐彦胜.大断面地铁换乘站近距离下穿既有运营车站施工技术研究[J].铁道建筑技术,2016(4):68-72.
[9]李志荣.数码电子雷管在铁路隧道掘进爆破中的应用[J].铁道建筑技术,2012(8):64-66.
[10]邵式亮,杨晓平,武迪.土钉墙支护设计与施工技术[J].施工技术,2009,38(S2):64-66.
[11]韩健勇,赵文,贾鹏蛟,等.桩锚支护结构深基坑受力变形及稳定性分析[J].地下空间与工程学报,2017,13(S2):907-914.
[12]王卫东,徐中华.基坑工程技术新进展与展望[J].施工技术,2018,47(6):53-65.
[13]王国富,刘凤洲,王丹,等.紧邻高层结构深基坑支护方案优化分析-以济南地铁R3线龙洞庄车站基坑为例[J].隧道建设,2017,37(6):708-716.
[14]刘露,王贵珍,刘志永,等.逆作法在南坪交通枢纽工程基坑支护中的应用[J].重庆建筑,2010(9):45-48.
[15]张玉成,杨光华,胡海英,等.多种支护型式在超大深基坑工程设计中的组合应用[J].岩土工程学报,2014,36(S2):198-204.
[16]王永玮,逄文慧.深基坑工程风险评价分析[J].施工技术,2017,46(S2):330-334.