Study on the characteristics of rock failure strain and acoustic emission field for two parallelling faults with the same slip direction including asperities     

焦明若  张国民  马胜利  马宏生 《地震学报(英文版)》2002,15(4):374-382

Introduction Concerning about research on grouped-earthquake seismogenic and occurrence, at present it is only limited on the stage of the theoretical analysis and numerical model. For instance, ZHANG (1987) simulated the grouped-earthquake generation and physical mechanism making use of spring-block principle. Applying for non-linear dynamic model, referring to Chinese continental plate as object, LI, et al (1997) performed the numerical simulation on the seismogenic and occurring of group…  相似文献   

钢筋砼摩擦耗能支撑框架结构的单元刚度和力学模型分析     

李慧峰  张玉蓉 《地震研究》2002,25(1)

为研究钢筋砼摩擦耗能支撑框架结构的动力反应性能 ,对其中的摩擦耗能器单元和框架杆单元的单元刚度和力学模型做了分析。钢筋砼摩擦耗能支撑单元由支撑杆单元和钢板—橡胶摩擦耗能器单元组成 ,支撑单元可取空间杆单元 ,摩擦耗能器单元为平面应力矩形单元。摩擦耗能器单元的剪切恢复力曲线为理想的弹塑性曲线 ,根据耗能器单元的力学模型 ,可确定其在每一时刻的刚度 ;框架结构空间杆单元的恢复力模型采用双线型模型 ,根据杆单元的力学模型 ,可确定其在每一时刻的刚度。并利用所编制的程序对十层单榀两跨空间普通框架和摩擦耗能支撑框架在地震作用下进行了弹塑性反应时程分析 ,结果表明耗能支撑框架的顶层最大位移明显小于普通框架  相似文献   

填土引发的桩基负摩阻力问题及其灌浆处理技术   总被引：1，自引：0，他引：1  

黄小许  王琼  毛桂平 《地质灾害与环境保护》2003,14(4):43-46

阐述了填土地基的沉降计算方法，分析了填土引发桩基负摩阻力的机理及危害，探讨了采用压力灌浆技术加固填土地基、消除桩基负摩阻力、控制桩基沉降的加固机理、施工工艺和应用效果。  相似文献   

Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999——2001 in the northeast margin of Qinghai-Xizang block     

张希 江在森王琪  张晓亮 《地震学报(英文版)》2003,16(4):395-403

Through numerical simulation for GPS data, aseism/c negative dislocation model for crustal horizontal movement during 1999-2001 in the northeast margin of Qinghai-Xizang block is presented, combined with the spatial distri-bution of apparent strain field in this area, the characteristics of motion and deformation of active blocks and their boundary faults, together with the place and intensity of strain accumulation are analyzed. It is shown that: a) 9 active blocks appeared totally clockwise motion from eastward by north to eastward by south. Obvious sinistral strike-slip and NE-NEE relative compressive motion between the blocks separated by Qilianshan-Haiyuan fault zone was discovered; b) 20 fault segments (most of them showed compression) locked the relative motion between blocks to varying degrees, among the total, the mid-east segment of Qilianshan fault (containing the place where it meets Riyueshan-Lajishan fault) and the place where it meets Haiyuan fault and Zhuanglanghe fault, more favored accumulation of strain. Moreover, the region where Riyueshan-Lajishan fault meets north boundary of Qaidam block may have strain accumulation to some degree, c) Obtained magnitude of block velocities and locking of their boundaries were less than relevant results for observation in the period of 1993-1999.  相似文献   

Interaction between two sliders in a system with rate- and state-dependent friction   总被引：2，自引：0，他引：2  

何昌荣 《中国科学D辑(英文版)》2003,46(Z2)

This study examines slip recurrence patterns in a two-block spring-slider model with rate- and state-dependent friction. Both weak and strong heterogeneities are considered with different settings of coupling stiffness. The results show that the recurrence pattern of slips strongly depends on the degree of coupling between the two blocks. With strong coupling between the two blocks (e.g., kc/ki max >~1), the slip pattern of the system is simple and characterized by periodical stick-slips, with the two blocks slipping together. With strong heterogeneity in friction strength, period-2 motion is found for moderate coupling stiffness (kc/ki max=0.4) between the two blocks. More complicated patterns are found with weak coupling stiffness (kc/ki max=0.2) and strong heterogeneity. With strong heterogeneity, very weak coupling leads to chaotic slip patterns. With coupling stiffness kc=5 ki max and strong heterogeneity, chaotic slip patterns are not found, in contrast with the results by Huang and Turcotte who employed the classical static/kinetic friction law.  相似文献   

Comparative study of the inelastic response of base isolated buildings   总被引：1，自引：0，他引：1  

Daniel Ordoez  Dora Foti  Luis Bozzo 《地震工程与结构动力学》2003,32(1):151-164

This article presents a numeric comparative study of the inelastic structural response of base isolated buildings. The comparative study includes the following isolation systems: laminated rubber bearings, New Zealand one, pure friction and the frictional pendulum ones. The study is based on obtaining non‐linear response spectra for various design parameters using six earthquake records. Usually the base isolation of a new building seeks to maintain the structure in the linear elastic range. The response of old weak buildings or the response of new ones subjected to extreme earthquakes may not be, necessarily, in the aforementioned ideal elastic range. Consequently, it is important to characterize the response of isolated buildings responding inelastically. A conclusion from this research is that the isolators affect significantly the structural response of weak systems. Rubber isolators seem slightly less sensitive to plastification that may occur in the structure compared to friction isolators. Ductility demands in the structure are affected significantly by friction and neoprene protected systems, in particular sliding ones where larger demands are obtained. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

横山水库除险加固工程的安全论证——土工膜与结构面摩擦试验     

王琦  臧光文 《岩土力学》2003,(Z1)

土工膜是工程防渗处理的一种主要材料[1]。斜坡面上土工膜与结构面的抗滑稳定直接影响到工程的安全运行。摩擦试验模拟了现场施工和运行情况,得到土工膜与结构面的抗滑剪力和摩擦系数,对工程的安全进行了论证。  相似文献   

用于多频电磁波测井的负阻抗变换式有源接收天线     

刘海滨  佟文琪 《物探与化探》1997,21(1):58-61

本文对用负阻抗变换电路同小圆锥螺旋天线相结合,构成的有源接收天线进行了理论分析,并给出了该有源天线稳定工作的条件。结果表明,用该方法设计的有源接收天线具有较宽的频带、较高的灵敏度和较小的尺寸。是多频电磁波测井较理想的接收天线。  相似文献   

岩质边坡设计坡角和锚固方案的确定   总被引：3，自引：0，他引：3  

郭映忠 《工程地质学报》1996,4(2):1-6

本文运用赤平极射投影、块体理论和岩体力学的基本原理, 试探求一种可供边坡工程设计采用的确定人工岩质边坡最大安全设计坡角和锚固方案的简易方法。  相似文献   

结构内设备的摩擦摆隔震响应分析     

李大望  庄鹏  周锡元 《世界地震工程》2004,20(4):90-93

基于系统耦和振动微分方程，分析了结构内摩擦摆隔震设备的响应规律和隔震效果。计算结果表明，经过合理设计的摩擦摆系统能够显著控制设备的地震绝对加速度响应从而有效提高设备的抗震可靠度。  相似文献