西安建筑科技大学学报(自然科学版)

为研究砂土场地强夯振动规律,减少强夯对周边环境的影响,在某深厚粉细砂场地进行8 000 kN·m强夯试验,并进行强夯振动监测,分析强夯振动随测点距离的衰减变化规律和随楼层的衰减变化规律,确定了8 000 kN·m能级强夯安全施工距离,并对隔振沟隔振效果进行振动监测.根据试验数据进行非线性拟合,得到三向合振速随距离、楼层的变化规律,在夯点处,垂向振速最大,随着距夯点距离的增加,环向振速最大,在该深厚粉细砂场地8 000 kN·m能级强夯振动下的安全施工距离为220 m; 在不同楼层处,环向振速最大,在安全施工距离内,相比于框架结构,强夯振动对砖混结构的影响较大.

In order to study the law of dynamic compaction vibration in sandy soil site and reduce the impact of dynamic compaction on the surrounding environment, dynamic compaction test of 8 000 kN·m was conducted in deep silty sand site, and dynamic compaction vibration data was monitored.Analyze the variation regularity with the distance of measuring point under the dynamic compaction vibration and the variation regularity with the floor, determine the safe construction distance. According to the experimental data, the nonlinear fitting was carried out, test the effect of the vibration isolation. The nonlinear fitting is performed to get the change rule of three-way combined vibration with distance and floor. The results show that when the vibration velocity changes with the distance, the initial maximum vibration velocity is largest vertically,the safety distance of this deep silty sand site under dynamic compaction vibration of 8 000 kN·m is 220 m; when the distance is farther, the ring vibration speed is the largest. At different floors, the circumferential vibration velocity is the largest. In the safe construction distance, the strong vibration has a greater influence on the brick-concrete structure than the frame structure.

引言
1 试夯场地概况
2 试验方案
3 试验方案
4 隔振沟测试效果
5 结论

表1 试验场地各土层物理力学指标<br/>Tab.1 Physical and mechanical indexes of various soil layers in the test site

表1 试验场地各土层物理力学指标
Tab.1 Physical and mechanical indexes of various soil layers in the test site

表2 BlastmateIII振动监测仪技术参数<br/>Tab.2 BlastmateIII vibration monitor technical parameters

表2 BlastmateIII振动监测仪技术参数
Tab.2 BlastmateIII vibration monitor technical parameters

图1 BlastmateIII 振动监测仪<br/>Fig.1 BlastmateIII vibration detector

图1 BlastmateIII 振动监测仪
Fig.1 BlastmateIII vibration detector

图2 监测点布置示意图<br/>Fig.2 Monitoring point layout diagram

图2 监测点布置示意图
Fig.2 Monitoring point layout diagram

图3 三向振速随距离的变化曲线图<br/>Fig.3 Three-dimensional vibration velocity curve with the distance

图3 三向振速随距离的变化曲线图
Fig.3 Three-dimensional vibration velocity curve with the distance

图4 三向合振速实测值及拟合曲线<br/>Fig.4 Three-way combined velocity of the measured value and fitting curve

图4 三向合振速实测值及拟合曲线
Fig.4 Three-way combined velocity of the measured value and fitting curve

表3 式(1)拟合参数取值<br/>Tab.3 Formula(1)fitting parameter values

表3 式(1)拟合参数取值
Tab.3 Formula(1)fitting parameter values

图5 最大振速随距离变化曲线图<br/>Fig.5 The maximum vibration velocity curve with the distance

图5 最大振速随距离变化曲线图
Fig.5 The maximum vibration velocity curve with the distance

图6 三向位移随距离的变化曲线<br/>Fig.6 Three-dimensional displacement with distance curve

图6 三向位移随距离的变化曲线
Fig.6 Three-dimensional displacement with distance curve

图7 三向振速随楼层的变化曲线<br/>Fig.7 Three-dimensional vibration velocity curve with the floor

图7 三向振速随楼层的变化曲线
Fig.7 Three-dimensional vibration velocity curve with the floor

图8 三向振速实测值及拟合曲线<br/>Fig.8 Three- dimensional vibration actual measured value and fitting curve

图8 三向振速实测值及拟合曲线
Fig.8 Three- dimensional vibration actual measured value and fitting curve

表4 式(2)拟合参数取值<br/>Tab.4 Formula(2)fitting parameter values

表4 式(2)拟合参数取值
Tab.4 Formula(2)fitting parameter values

图9 三向位移随楼层的变化曲线<br/>Fig.9 Vertical and radial displacement curve with the floor

图9 三向位移随楼层的变化曲线
Fig.9 Vertical and radial displacement curve with the floor

表5 隔振沟隔振测试结果<br/>Tab.5 Vibration isolation vibration test results

表5 隔振沟隔振测试结果
Tab.5 Vibration isolation vibration test results

图10 隔振沟作用测试监测点位置示意图<br/>Fig.10 Vibration isolation groove effect test monitoring point position diagram

图10 隔振沟作用测试监测点位置示意图
Fig.10 Vibration isolation groove effect test monitoring point position diagram

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备注

引言

1 试夯场地概况

2 试验方案

3 试验方案

4 隔振沟测试效果

5 结论

期刊信息