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关键词： DF频段   视垂直位移   ASSM模型   gPhone重力仪   台风   地震活动  

摘要： 基于2015—2020年昆明地震监测中心站(以下简称“昆明站”)的gPhone连续重力观测数据,采用时频分析方法计算双频微震(DF)频段视垂直位移,利用全球地震背景噪声能量辐射模型(ASSM)正演昆明站DF频段信号,并结合台风和邻近重力站数据,对昆明站DF频段信号异常变化特征进行研究,探讨了昆明站周边地震活动与DF频段信号之间的关系。结果显示:①年变化趋势显示昆明站周边300 km范围内M S≥5.0地震易发生在台风频繁且DF频段视垂直位移较高的月份内,月变化趋势则显示地震易发生在视垂直位移由低转高的过程中。②2020年巧家M S5.0地震前DF频段信号的异常变化,并不是由巧家地震引起,而与印度洋台风有关。总结震前DF频段信号异常特征,有助于该地区中强地震预测研究。

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关键词： 滇西地震预报实验场   丽江M S7.0地震   重力场   时变特征  

摘要： 利用1989—1996年滇西地震预报实验场绝对重力和相对重力观测资料,采用逐年差分和多年累积的方法,分析滇西地震预报实验场内部不同时间尺度的重力场演变特征及其与丽江地震在时空上的对应关系,结果表明:①1992年以前,研究区内部重力场变化平稳,1993年出现局部变化,1995年变化急剧加大,震后快速反向调整,变化量值基本与震前多年累积相当,重力场演化特征与丽江地震存在高度时空对应关系,表明该时段重力场变化为丽江地震的孕震特征。②研究区差分及累积重力场动态演化过程中,在川滇菱形块体与滇西块体边界产生重力变化梯度带,表明这2个块体构造活动剧烈。③沿红河断裂带出现(-60~90)×10-8 m/s 2的重力变化高梯度带,其走向与红河断裂构造高度一致,反映区域重力场变化受主要活动构造控制,是地下深部壳幔物质运移的表现。

关键词： 基础加固   微型桩   沉降   承载力  

摘要： 某建筑在基坑施工时,由于基坑开挖与支护对邻近建筑基础造成了扰动,导致该建筑发生了较大的沉降。为对邻近建筑沉降进行控制,确保建筑结构安全,本文以某既有建筑基础加固为例,介绍了既有建筑沉降过大的原因以及加固方案,分析了不同加固方案的优劣,并对方案进行了验算,提出了采用微型桩进行托换加固的方案对该建筑基础进行加固,加固后经连续沉降观测,该建筑沉降得到了控制,表明该加固方案对于处理此类问题具有良好的加固效果。

关键词： 国产化操作系统   地震信息网络   运维管理系统   自动化监控   实用性  

摘要： 本研究开发了一套基于国产操作系统和数据库的地震信息网络运维管理系统,旨在提升地震信息网络的自主可控性、自动化监控水平和运维效率。系统通过模块化设计,实现了设备信息管理、自动化监控、智能告警和运维记录生成等功能。采用国产操作系统和数据库,解决了依赖国外软件带来的安全隐患,降低了维护成本。经过功能、性能和稳定性测试,系统展现了高效的设备监控与告警能力,并在实际应用中表现出良好的稳定性和可扩展性。系统的推广应用不仅提高了地震信息网络的运维管理水平,还产生了显著的社会和经济效益。

关键词： Gaussian distribution  

摘要： There are a large number of bridges with larger underwater penetration in southwestern region of China, they are susceptible to seismic effects, and their seismic vulnerability analysis is of great significance. There are lacks in exploring correlation of structural parameters and effects of seismic directionality on vulnerability of deepwater bridges in existing studies. Here, a fast method for analyzing seismic vulnerability of deepwater bridges was proposed by integrating Gaussian process regression (GPR) and Nataf transform. This method could fully consider the uncertainty and inter-correlation of bridge parameters. Based on this method, effects of seismic directionality, bridge underwater penetration and structural parameter correlation on the seismic vulnerability of deepwater bridges were explored, and the proposed method was illustrated taking the seismic vulnerability analysis of a deepwater rigid frame bridge in a certain reservoir area as an example. The results showed that not considering correlation of structural parameters can increase the probability of bridge failure, deepwater environment can increase the damage probability of bridge structure, and direction of seismic action can affect obviously the vulnerability of components;deep-water environment can cause variation of laws of seismic direction affecting bridge vulnerability. © 2025 Chinese Vibration Engineering Society. All rights reserved.

关键词： Seismic response  

摘要： Interaction between grain particles and silo structure under earthquake action can lead to larger dynamic lateral pressure on silo wall to cause functional failure of silo structure. Here, to quickly and correctly evaluate grain-silo interaction seismic response of silo structure, an improved dynamic analysis model for silo structure with added mass and a calculation method for describing distribution law of added mass inside silo were proposed. The dynamic lateral pressure generated by grain dispersion at a certain point on silo wall could be equivalent to the inertial force generated by motion of grain dispersion with a certain mass attached to silo wall at that point without considering contribution of other parts of stored material to dynamic lateral pressure of silo wall at that point. A simplified grain-silo interaction dynamic model of silo structure with improved added mass was developed, and seismic responses of silo structure under different seismic waves and peak accelerations were studied with numerical analysis. The multi-working condition series dynamic time-history analyses showed that the improved added mass method can correctly and efficiently realize grain-silo interaction seismic response analysis of bulk grain-silo structure;based on parametric studies for different stored material heights, acceleration responses of silo wall and stored material follow a bi-linear relationship with silo structure height-diameter ratio and peak accelerations;the distribution of dynamic overpressure along silo wall height direction is different from that specified in EC8 regulation, it exhibits a nonlinear trend, and overpressure peak values are concentrated in silo middle and lower parts;the improved added mass model can realize decoupling calculation of silo structure's grain-silo dynamic interaction to effectively avoid nonlinear complex dynamic problems between grain particles and silo structure. © 2025 Chinese Vibration Engineering Society. All rights reserved