排序方式: 共有66条查询结果,搜索用时 15 毫秒
41.
Analysis on the Seismic Response of Soil Slopes Based on the Multi-point Input Method 总被引:1,自引:1,他引:0
In general, the seismic response analysis in earthquake engineering assumes that the vibration parameters of the target and the contact surface of the external media are identical, i. e., single point input. However, earthquake energy has an attenuation phenomenon in wave propagation, so a wide range of soil slopes and the external medium contact surface of different input points on motion are not identical. If we consider single point input only, it may not correspond with reality, so it is necessary to carry out research on multi-point input methods. Based on the 2-D slope model, single-point input and multi-point input are performed respectively to analyze and compare their similarities and differences in the perspectives of the characteristics of seismic response of soil layer and plastic zone distribution to provide a reference for the seismic design of slopes. The results show that in the perspective of soil seismic response analysis, the peak acceleration output and peak velocity output under multi-point input are greater than the peak values under single point input at the same monitoring point, the peak appearing time is also earlier than that of the single point input; in terms of the plastic zone distribution, the multi-point effect is manifested as the presence of more obvious tensile shear failures; in the perspective of safety coefficient, the safety coefficient under each multi-point input is smaller than that of single point input, a difference of about 7% or so. In summary, multi-point input is more reasonable and practical than single point input, so multi-point input should be considered in seismic design. 相似文献
42.
43.
44.
45.
介绍了SS YD型断层观测伸缩仪的系统组成及其基本原理。该系统实行现场自动采集和自动储存并由“数据交换器”进行数据调用和回放 ,具备交直流电源自动转换及有效的避雷装置 ,实现了无人值守。仪器所得观测数据稳定 ,并记录到清晰的应变固体潮汐与台湾“9.2 1”大地震 0 .5 μm的同震阶跃 相似文献
46.
DSQ水管倾斜仪和SS-Y伸缩仪观测条件建设要点 总被引:1,自引:0,他引:1
本文以辽宁省铁岭地震台DSQ水管倾斜仪和SS-Y伸缩仪观测条件建设实践为基础,运用设计规范理论指导工作实践,对山洞基岩基础施工、仪器岩石礅的布设安装、礅面水平处理以及防水、密封等各施工步骤、方法作了较详尽的论述。其中仪器礅面水平处理和防水、密封等操作方法略有独到之处。 相似文献
47.
48.
多点最小二乘匹配的可变权阵阵列松弛算法 总被引:2,自引:0,他引:2
本文详细介绍了多点最小二乘匹配的常规算法和由阵列代数表示的阵列松弛算法,并把Rauhala限于等权的情形推广到不等权(变权)的情形,给出了实现阵列松弛的步骤,最后从计算效率,匹配精度对常规算法,等权阵列松弛和不等权阵列松弛进行了比较,分析,揭示了变权阵列松弛法巨大的实用潜力。 相似文献
49.
选取辽宁省、河北省、山西省、山东省、江苏省、湖北省部分观测质量好的应变数据,计算和统计2012~2016-05-15期间区域应变参数--最大主应变、最小主应变、主方向、最大剪应变变化情况,并结合区域3级以上地震统计情况分析相应区域的短期地震活动性。 相似文献
50.
针对河北永年地震台伸缩仪EW分量2015年5月11日起出现的加速拉张变化,从仪器工作状态、洞室环境、气象条件和外界环境干扰等方面,进行调查分析。利用3种荷载模型计算道路施工荷载变化可能引起的应变变化量,并结合其他形变测项变化特征进行论证,认为永年伸缩仪张性变化是区域应力场调整的结果。 相似文献