控制性深孔地震输入界面位置的确定方法和影响研究     

洪海春  许汉刚  陶小三  邵斌  薛莹莹 《震灾防御技术》2013,8(1):52-61

探讨了在工程场地地震安全性评价的地震反应分析模型中,江苏省盐城地区部分工程场地内深度超过100m时剪切波速仍小于500m/s的控制性深孔,采用近似估算方法弥补所缺波速值和确定地震输入界面后,进行波速值和地震输入界面位置的不确定性对工程场地地震反应的影响研究,包括地表地震动峰值加速度和反应谱特征周期等,为其他地区控制性深孔的地震输入界面位置的确定方法和影响研究提供参考。  相似文献   

A study on dynamic shear strength on frozen soil-concrete interface     

Peng Lv  JianKun Liu  YingHui Cui 《寒旱区科学》2013,5(4):0408-0412

Using newly developed dynamic shearing devices, the dynamic shearing strength of frozen soil-concrete interface was studied experimentally. By placing concrete blocks in the lower half of the shear box and frozen soil sample in the upper part, a series of dynamic shear tests on their interfaces were carried out. The obtained results are summarized and the main influencing factors are revealed.  相似文献   

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument     

郭井学  孙波 《极地研究(英文版)》2007,18(1):36-46

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.  相似文献   

COM原理概述   总被引：9，自引：0，他引：9  

冯正全 《成都信息工程学院学报》2004,19(3):398-402

组件对象模型(COM)是与平台无关的、分布式的、面向对象的.COM是微软OLE,ActiveX等的基础技术.更好的理解COM,关键是脊柱COM不时面向对象的语言,而是创建二进制软件组件大标准.  相似文献   

Temporal variability of water quality of submarine groundwater discharge in Ubatuba,Brazil     

M. Taniguchi  T. Stieglitz  T. Ishitobi 《Estuarine, Coastal and Shelf Science》2008

Measurements of electric resistivity of the seabed and of the electric conductivity of submarine groundwater discharge (SGD) collected in seepage meters have been made to evaluate temporal variability of the origin and quality of submarine groundwater discharge in Ubatuba, Brazil. A diurnal variation of SGD conductivity was found under the condition of semi-diurnal tidal changes over a period of 4 days. Both the ground resistivity and the conductivity of the discharged groundwater indicated that the freshwater–saltwater interface moved towards offshore at high tide, i.e. in the direction opposite to commonly made observations. SGD comprised a combination of Submarine Fresh Groundwater Discharge (SFGD) of terrestrial origin, and of Recirculated Saline Groundwater Discharge (RSGD) of marine origin. The maximum of the terrestrially derived fraction SFGD/SGD was found at a distance of 50 m offshore. A lower SFGD/SGD ratio was found closer to shore, where the highest SGD flux was measured. SGD conductivity and ground resistivity displayed a diurnal cyclicity at semi-diurnal tidal water level variations, indicating that tidal water level fluctuations may not be the primary driver of SGD flux, but preferential flow in volcanic hydrogeologic setting at Ubatuba.  相似文献   

A three dimensional embedded beam element for reinforced geomaterials     

Machhour Sadek  Isam Shahrour 《国际地质力学数值与分析法杂志》2004,28(9):931-946

This paper presents the formulation and verification of a 3D embedded beam element, which is intended for numerical modelling of three dimensional problems concerned by reinforced geomaterials. This element permits analysis of reinforced geomaterial structures with simplified meshes, that do not need to account for reinforcement orientation. The paper is composed of four sections. Section 1 discusses the need for the development of a particular beam element for soil reinforcement, which can be easily used in practical applications. Section 2 describes the mathematical formulation of this element, while Section 3 deals with its verification on various examples. Section 4 illustrates an application of this element by analysing the behaviour of a group of micropiles containing inclined elements and subjected to lateral loading. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Numerical modelling of regional faults in land subsidence prediction above gas/oil reservoirs     

Massimiliano Ferronato  Giuseppe Gambolati  Carlo Janna  Pietro Teatini 《国际地质力学数值与分析法杂志》2008,32(6):633-657

The stress variation induced by gas/oil production may activate pre‐existing regional faults. This may enhance the expected land subsidence due to the generation of mechanically weak points close to the producing field. A class of elasto‐plastic interface elements (IE), specifically designed to address the mechanical behaviour of faults over a regional scale, is integrated into a finite element (FE) geomechanical model and used to investigate the role exerted by active faults in anthropogenic land subsidence. The importance of regional faults depends on a variety of factors including depth of the depleted reservoir, fault number, orientation and size, geomechanical properties of porous medium, pore pressure drawdown induced by fluid production, etc. With the aid of some representative examples, a useful indication is provided as to where and how fault activation may influence both magnitude and extent of the land subsidence bowl above producing gas/oil reservoirs, pointing to a generally limited impact on the ground surface. The simulation of a real faulted gas reservoir in a complex 3‐D setting shows that the proposed IE can be simply and efficiently incorporated into a FE geomechanical model, thus improving the quality of the stress and displacement prediction. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

基于Matlab的地图投影程序设计     

张帅  邱春霞  杨存英  钱磊  苏卉 《测绘与空间地理信息》2016,(9):206-209

随着地理信息系统(GIS)的发展与应用,地图投影转换成为GIS软件是当前面临的一个主要问题。本文首先分析和阐述了Matlab的程序设计基础、图形用户界面及地图投影整体程序设计,然后结合Matlab的计算程序,实现了高斯投影正算与反算、高斯投影换带、高斯投影与UTM投影之间转换的计算。通过实例验证了程序的可行性,满足了工程需要,为基于Matlab的地图投影程序设计提供了重要的参考依据。  相似文献   

A statistical analysis of the distribution of cordierite and biotite in hornfels from the Bugaboo contact aureole: implications for the kinetics of porphyroblast crystallization          下载免费PDF全文

A. Petley‐Ragan  F. Gaidies  D.R.M. Pattison 《Journal of Metamorphic Geology》2016,34(1):85-101

The three‐dimensional disposition of cordierite and biotite crystals in a hornfels from the contact aureole of the Bugaboo Batholith is quantified using high‐resolution X‐ray micro‐computed tomography and global as well as scale‐dependent pattern statistics. The results demonstrate a random distribution of cordierite and biotite crystal sizes for all scales across the entire rock volume studied indicative of interface‐controlled prograde metamorphic reaction kinetics. The reaction considered responsible for the mineral assemblage and the formation of cordierite and biotite in the hornfels is Ms + Chl + Qtz = Crd + And + Bt + . Rock‐specific phase equilibria point to metamorphic conditions of ~520 –550 °C and 3 kbar for this reaction. The common approach to approximate the shape of crystals as spherical underestimates the influence of the Strauss hard‐core process on rock texture and may be misinterpreted to reflect ordering of crystal sizes by inhibition of nucleation and growth commonly associated with diffusion‐controlled reaction kinetics. According to our findings, Strauss hard‐core ordering develops at length scales equal to and less than the average major axis of the crystal population. This is significantly larger than what is obtained if a spherical crystal geometry would be assumed, and increases with deviation from sphericity. For the cordierite and biotite populations investigated in this research, Strauss hard‐core ordering developed at length scales of up to ～2.2 and 1.25 mm, respectively, which is almost 1 mm longer than the scales that would be obtained if a spherical geometry would have been assumed. Our results highlight the importance of a critical assessment of the geometrical model assumptions commonly applied in the three‐dimensional analysis of crystal size distributions, and underline the need for a quantitative understanding of interface processes in order to appreciate their role in the kinetics of contact metamorphic reactions and rock texture formation.  相似文献   

基于微信公众平台的天地图地名更新技术应用研究     

张伟  相恒茂  涂振发  杨浚  张存业 《地理信息世界》2016,(4):90-94

针对目前天地图地名数据更新存在的针对性差、专业性强、频率低等问题,本研究利用微信等新媒体获取地图变化信息并进行地名数据更新,提出了基于微信公众平台的当前地理位置主动式获取更新方法、电子地图发现式更新和指定条件查询式更新等方法,在天地图山东地名数据更新中得到了应用,相对于传统的地名更新模式,此方式数据更新频率更快、成本更加低廉,有助于保证天地图山东的数据现势性。  相似文献