Study on simple estimate method of soil parameters and applicability of simplified equation of attenuation with distance in prediction of ground vibration

土体参数简易估计方法及距离衰减简化方程在地面振动预测中的适用性研究

• 批准号: 14550479
• 负责人: KITAMURA Yasutoshi
• 金额: $ 2.18万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550479/
• 关键词: ground vibration; falling weight impactor; neural network; visco-elastic half-space; soil parameter; attenuation with distance; prediction of vibration; ニュートラルネットワーク

This research is performed on the following five items ; 1)the manufacture of simple exciting equipment, 2)the establishment of estimate system, 3)the improvement of estimate system, 4)the applicability of simplified equation of attenuation with distance, 5)the measurement of predominant frequency.In the item 1, the exciting equipment with the total mass of about 30 kg is manufactured by combining a falling weight and a spring. It is examined through the field measurement that the equipment generates exciting force about equal to expected force.In the item 2, a neural network system is built to estimate soil parameters in which the ground is modeled as a visco-elastic half-space and the waveform of exciting force obtained in the item I is used. It is confirmed that this estimate system is possibly applied to practical use.In the item 3, the improvement of neural network is treated.. It is examined whether the estimate system is improved by using horizontal displacements instead of time lags. From results for several soil profiles, it is found that it doesn't lead to improvement of the system to exclude the time lags from input parameters.In the item 4, it is examined to relate coefficients in Bronitz equation to soil parameters estimated in the item 3. It is found that Bornitz equation with the coefficients obtained from estimated soil parameters may be applicable to prediction of the attenuation with distance of ground vibration.In the item 5, it is performed to find out whether it is possible to pick out predominant frequency at a site from ground vibrations measured in the daytime and to use the predominant, frequency for the prediction of ground vibration from the viewpoint of simple prediction method.

本研究针对以下五个项目进行； 1）简易激振装置的制作，2）估算系统的建立，3）估算系统的改进，4）衰减随距离的简化方程的适用性，5）主频率的测量。第1项中，用落锤和弹簧组合制作了总质量约30公斤的激振装置。通过现场测量，设备产生的激振力与预期力大致相等。第2项中，将地面建模为粘弹性半空间，采用第1项中得到的激振力波形，建立了神经网络系统来估计土壤参数。证实了该估计系统可能应用于实际应用。在第3项中，讨论了神经网络的改进。检查是否通过使用水平位移代替时滞来改进估计系统。从几个土壤剖面的结果来看，发现从输入参数中排除时滞并不会导致系统的改进。在第4项中，研究了将Bronitz方程中的系数与第3项中估计的土壤参数联系起来。发现使用从估计的土壤参数获得的系数的Bornitz方程可能适用于预测地面振动随距离的衰减。在第4项中 如图5所示，从简单预测方法的角度来看，是否可以从白天测量的地面振动中找出某个地点的主频，并使用该主频来预测地面振动。

项目成果

Kazuhiro, Yamamoto: "A Simple Estimation Method of Soil Properties Using Neural Network for Prediction of Ground Vibration"Proc.of the International Seminar on environmental Vibration, China. 458-465 (2003)

Kazuhiro, Yamamoto：“使用神经网络预测地面振动的土壤特性的简单估计方法”，中国环境振动国际研讨会论文集。

K.Yamamoto: "A Simple Estimation Method of Soil Properties Using Neural Network for Prediction of Ground Vibration"Proc.of the international Seminar on Environmental Vibration, China. 458-465 (2003)

K.Yamamoto：“使用神经网络预测地面振动的土壤特性的简单估计方法”，国际环境振动研讨会论文集，中国。