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  刘超,梁海安,程新俊,聂佩江,李俊豪,吕毅.城市软土地基组合锤法强夯施工振动效应研究[J].震灾防御技术,2021,16(2):381-390, DOI:10.11899/zzfy20210217.

城市软土地基组合锤法强夯施工振动效应研究
摘要:    为研究组合锤法强夯振动对周边场地环境的影响,对南昌市某软土地基进行现场原位试验。考虑距强夯点的距离、振动方向及锤击次数的影响,在各监测点分别布置水平东西、南北向和竖向振动传感器。结果表明:采用组合锤法进行地基强夯施工时,场地竖向振动是需重点监测的内容,振动响应随监测点与强夯点距离的增大而减小;距强夯点50 m范围处地面振动速度衰减至0.2 cm/s以下,可根据地面振动速度确定安全施工范围;地面加速度受锤击次数的影响较大,且水平向加速度对锤击次数的敏感性略高于竖向,锤击次数对地面水平向振动的影响不可忽略;基于试验数据和波源振动理论建立的振动加速度衰减模型综合考虑了距强夯点的距离、振动方向和修正系数(锤击次数的影响),经算例验证具有较强的适用性,可为同类场地采用组合锤法强夯施工提供参考。
作者单位
刘超 东华理工大学土木与建筑工程学院南昌 330013 
梁海安 东华理工大学土木与建筑工程学院南昌 330013 
程新俊 东华理工大学土木与建筑工程学院南昌 330013 
聂佩江 东华理工大学土木与建筑工程学院南昌 330013 
李俊豪 东华理工大学土木与建筑工程学院南昌 330013 
吕毅 东华理工大学土木与建筑工程学院南昌 330013 
关  键  词:组合锤法  场地振动  能量衰减  安全距离  强夯施工
DOI:10.11899/zzfy20210217
基金项目:国家重点研发计划(2016YFC0800205);软土就地固化最优配比及加固效果研究(ZR2020000025)
收稿日期:2021-01-11
作者简介:刘超,男,生于1996年。硕士研究生。主要从事桩基础与振动效应方面的研究。E-mail:liuchao9608@foxmail.com
通讯作者:梁海安,男,生于1980年。博士,副教授。主要从事基础工程及岩体力学方面的研究。E-mail:lianghaian@foxmail.com
Study on Vibration Effect of Combined Heavy Tamping on Soft Soil Foundation in City
Abstract:      In order to study the vibration effect of composite hammer method on the surrounding environment and its influencing factors, a soft soil foundation in Nanchang was tested. In the test, the influence of different distance, vibration direction and hammer times from the tamping point is considered, and the horizontal east-west, north-south and vertical vibration sensors are arranged at each measuring point respectively.The results show that the vertical vibration of the site is the key content to be monitored during the dynamic compaction of foundation by the combined hammer method, and the vibration response decreases with the increase of the distance between the monitoring point and the hammer point.The vibration velocity of the ground out the 50 m range attenuates to less than 0.2 cm/s, and the safe construction range can be determined according to the vibration velocity of the ground.The ground acceleration is greatly affected by the number of hammer blows (the maximum increase is 61.0%), and the sensitivity of horizontal acceleration to the number of hammer blows is slightly higher than that of vertical. The impact of the number of rammers on the horizontal vibration of the ground cannot be ignored.The attenuation model of vibration acceleration based on test data and wave source vibration theory takes into account the influence of distance, vibration direction and correction coefficient (the number of hammer strikes), which is proved to have strong applicability by calculation examples, and provides a certain reference for similar sites using combined hammer method.
Keywords:  Combination hammer  Field vibration  Energy attenuation  Safe distance  Dynamic compaction construction
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