超重型液压快速夯实技术对周边环境的振动影响分析
Analysis of vibration impact of ultra-heavy rapid hydraulic compaction technology on surrounding environment
方正 1卜发东 1张占奎 2陈崇欣2
作者信息
- 1. 山东省建筑科学研究院有限公司,山东 济南 250031
- 2. 山东省机械施工有限公司,山东 济南 250021
- 折叠
摘要
液压快速夯实技术在地基处理中适用范围广、加固效果好,但关于超重型液压快速夯实技术对周边环境的振动影响及有效加固深度仍需进一步探讨.本文以济南国际机场二期改扩建项目为研究背景,场地浅层分布2～7 m的难压实、可液化粉土地层,极易在机场运营期间产生液化危害,因此在机场项目正式施工前,设计6种不同夯击能级的强夯、液压夯地基处理现场试验,对比研究 150 kJ 超重型液压快速夯实技术对周边环境的振动影响,并在150 kJ 超重型液压夯试验前后分别进行标准贯入试验,分析 150 kJ 超重型液压夯的有效加固深度.研究表明:150 kJ超重型液压夯在距发振点10 m时满足小于等于24 mm/s的容许振动值要求,在距发振点15 m时满足小于等于12 mm/s的容许振动值要求,在距发振点超过15 m时,70 kJ、110 kJ及150 kJ液压夯均对周边环境产生的振动影响较小;150 kJ 超重型液压夯在 2～8 m 范围内加固效果明显,在 10 m 时有一定的加固效果;在距发振点超过15 m时,采用150 kJ超重型液压夯既能满足对居住建筑容许振动值的要求,又能增大加固深度,提高经济效益.
Abstract
Rapid hydraulic compaction technology has wide application range and good reinforcement effect in foundation treatment,but the vibration impact of ultra-heavy technology on the surrounding environment and the effective reinforcement depth still needs to be further discussed.This paper takes Jinan International Airport Phase Ⅱ renovation and expansion project as research background.In the shallow layer of the site,2-7 m silt is difficult to be compacted and can be liquefied,which is easy to cause liquefaction hazards during airport operation.Therefore,before the formal construction of the airport project,six different levels of compaction energy were designed for on-site trials,with special attention on the vibration impact on the surrounding environment of the 150 Kj ultra-heavy rapid hydraulic compaction technology(150 Kj compaction for short).The standard penetration test was carried out before and after 150 Kj compaction test,and the effective strengthening depth of 150 Kj compaction was analyzed.The research shows that 150 Kj compaction meets the requirements of peak vibration 24 mm/s at a distance of 10 m from the vibration point,and 12 mm/s at a distance of 15 m.When the distance from the vibration point is greater than 15 m,70 Kj,110 Kj and 150 Kj hydraulic compaction all have small vibration effects on the surrounding environment.150 Kj compaction has obvious reinforcement effect in the depth of 2-8 m,and has a certain reinforcement effect at depth of 10 m.When the distance from the vibration point is greater than 15 m,150 Kj compaction can not only meet the permissible vibration value of residential buildings,but also increase the reinforcement depth and improve economic benefits.
关键词
液压快速夯实技术/超重型/强夯/振动影响/有效加固深度Key words
rapid hydraulic compaction technology/ultra-heavy/dynamic compaction/vibration impact/effective reinforcement depth引用本文复制引用
出版年
2024
NETL
NSTL
万方数据