2012年10月上第41卷第374期
施工技术
CONSTRUCTION TECHNOLOGY
深层冲击成孔振动环境影响分析
黄俊，张波？
（1.北京工业大学城市与工程安全减灾教育部重点实验室，北京100124：
2.北京城建勘测设计研究院有限责任公司，北京100101)
【摘要】对郑州中心城区某场地胶结层冲击钻孔施工进行现场监测，监测内容主要有地表加速度、深部土层加速度及土层的分层沉降。对深层沉降及地表报动频谱进行分析，得出现场施工对淤泥质粉质黏土的扰动程度及地表振动规律，并合理评价冲击振动对周边环境影响。研究表明：冲击产生的振动在地表和地层内部衰减较快。测得的
要由软弱层振陷引起，建筑物差异沉降小于规范要求。
【关键词调】地下工程；冲击钻孔；振动；衰减规律；现场试验；监测；沉降
[中图分类号］TU753.3
【文献标识码】A
【文章编号】1002-8498(2012)19-0019-04
EnvironmentalImpactAnalysis ofVibrationInduced
by DeepPercussion Drilling
Huang Jun',Zhang Bo
(1. The Key Laboratory of Urban Security and Disaster Engineering,
Ministry of Education, Bejing Unirersity of Technology, Beijing 100124, China;
2. Beijing Urban Construction Exploration & Surveying Design Research Institute Co., Lad., Bejing100101, China) Abstract:For a project in central Zhengzhou, the process of percussion drilling on deep glued layer was monitored. The major monitoring parameters included surface acceleration, deep layered acceleration and layered settlement. Based on analysis of layered settlements and surface vibration spectrum, conclusions were drawn regarding the principles of surface vibration and the degree of disturbance to mucky silty clay caused by the drilling process. The environmental impact induced by drilling construction was properly evaluated. This study shows that vibration caused by drilling decreases rapidly in surface and formation. The measured vibration frequencies are mainly in high-frequency side. Vibration caused by drilling did not resonate with building, and hence the impact on building was limited. Ground settlements were mainly caused by vibration-subsidence of soft layers. Differential settlement of the building is less than the regulatory requirements.
Key words:underground; percussion drilling: vibrations; attenuation law; tests; monitoring; settlement
冲击荷载产生的振动波从振源四周径向传播，空间高度方向及地表的影响都很大，传播距离远1)。振动对环境影响主要体现在：动荷载对建筑及建筑地基产生影响，使地基产生不均匀沉降而造成建筑结构受力不合理，特殊地段可能对人的生活、精密仪器和设备使用产生影响[24]。沈军明[5] 以最大合速度作为强振动对环境影响的评价指标，得到了速度衰减公式和最小安全距离。施有志"]结合强夯振动工程实例，分析了强夯施工引起
【收稿日期】2012-04-05
【基金项目】国家973项目（2007CB714203）；北京市自然科学基金重点项目(8111001)
[作者商介】黄
俊，博士研究生，E-mail：bjyq520@163，com
的振动规律及振动对环境的影响。
19
本文针对郑州城区某场地进行的冲击钻孔施
工进行现场监测，通过研究波在地层的传播规律、淤泥质粉质薪土层及粉砂层的振陷，评价振动对场地周边环境的影响，为类似工程的安全施工和振动
测试提供借鉴。工程概况
监测场地位于郑州市花园路以西，纬三路以北。场地内拟建建筑地下3层为车库及设备用房，主楼地上33层，总高度约139.3m，基坑开挖深度为 18~20m。桩基施工至深部38~45m胶结层后旋挖钻机无法进尺，改用冲击成孔法，总桩数为270根。