岩土力学实验数据的自动处理

本文介绍了在岩土力学的声波法、地震法弹性波试验和应力波、地震波衰减规律的研究中,利用电脑进行数据自动处理和作图的程序及其应用。     

Naturally Accepted Boundary Conditions for the Brazilian Disc Test and the Corresponding Stress Field

The stress field developed in the Brazilian disc is determined assuming that the disc is under the influence of a combination of two load distributions, namely normal (radial)- and shear (frictional)-stresses, both of them acting along two finite symmetric arcs of the disc periphery. The nature of the two distributions as well as the extent of the loaded arcs are obtained from the solution of the respective contact problem according to which the disc and the jaw are considered as a system of two elastic plane bodies in contact pressed against each other. Emphasis is given to the stresses due to friction since the stress field due to the specific distribution of radial pressure is already known. It is concluded that the role of friction cannot be ignored, especially in the immediate vicinity of the contact rim. Moreover, for high surface roughness the overall transverse normal stress component in this region becomes of tensile nature indicating increased possibility of premature local cracking (taking into account the low tensile strength of the materials tested using the Brazilian disc test). On the other hand, the stress field at the disc’s center is totally insensitive to both the exact distribution of radial pressure and also to the presence or absence of friction. It is thus indicated that in case fracture in the immediate vicinity of the contact rim is by some means suppressed (reducing for example drastically the coefficient of friction) the results of the Brazilian disc test correspond, in a satisfactory manner, to those predicted by Hondros’ classic approach.     

Location of the Crack Initiation Points in the Brazilian Disc Test

To study the location of crack initiation and its failure mode in the Brazilian test, the analytical location of the crack initiation under different failure modes was first discussed with the stress formulas of the Brazilian test. Then, by using the numerical simulation technique of fast Lagrangian analysis of continua to simulate the ideal Brazilian test, we found that: (a) when the crack was a tensile fracture, the crack initiation point was found to be around the maximum tension stress point; (b) when the crack was a shear failure, the crack initiation point, which was only related to the internal friction angle, was found between the maximum tension stress point and the tensile critical point; and c. the numerical conclusion well verified the correctness of the theoretical analysis and was in good agreement with the results of other papers.     

Review and Prospect of Information Work on Rock and Soil Mechanics

The information work is a part unable to separate with scientific research of rock and soil mechanics. The review and prospect of information work in out institute are made in brief. Some ideas about the information work for the future are also given in this paper.     

新型岩石力学测试系统及应用领域

介绍了Ｔｅｒｅａ Ｔｅｋ系统的组成和其主要功能，并针对石油工程和钻探领域应用岩石力学参数领域作了阐述。     

岩土力学文献情报工作的回顾与展望

岩土力学文献情报工作是科研工作的不可分割的一部分。本文简要回顾我所岩土力学文献情报工作及其发展,并提出了今后岩土力学文献情报工作的几点设想。     

A Review of Some Rock Mechanics Issues in Geothermal Reservoir Development

Rock mechanics and geomechanical studies can provide crucial information for economic geothermal reservoir development. Although significant progress has been made in reservoir geomechanics, technical challenges specific to the geothermal area (high temps, data collection, experimentation issues) have prevented widespread use of geomechanics in geothermal reservoir development. However, as the geothermal industry moves to develop more challenging resources using the concept of enhanced geothermal systems (EGS), and to maximize productivity from conventional resources, the need for improved understanding of geomechanical issues and developing specific technologies for geothermal reservoirs has become critical. Rock mechanics research and improved technologies can impact areas related to in-situ stress characterization, initiation and propagation of artificial and natural fractures, and the effects of coupled hydro-thermo-chemo-mechanical processes on fracture permeability and induced seismicity. Rock mechanics/geomechanics research, including experimental and theoretical investigations as well as numerical and analytical solutions, has an important role in optimizing reservoir design and heat extraction strategies for sustainable geothermal energy development. A number of major areas where rock mechanics research can facilitate geothermal systems development are reviewed in this paper with particular emphasis on EGS design and management.     

岩石多次全过程压入硬度的测试试验

介绍了在ＭＴＳ８１５型岩石力学试验机上配置专用夹具和平底圆柱压模后成功地进行岩石表面多次全过程压入破碎试验的情况,分析了这种试验方法与传统的单次压入硬度测试法相比在反映岩石破碎过程特征、表征岩石压入硬度方面所具有的优点。最后邮进一步研究应解决的几个问题。     

澳大利亚国家科学与工业研究组织蔡城基博士来我所参观和讲学

今年五月三十日至六月二日,澳大利亚国家科学与工业研究组织(CSIRO)下属岩土力学研究所的蔡城基博士(Dr S.K Choi)来我所参观和讲学。     

电子计算机在岩土力学实验测试中的应用(续)

四、实验系统对计算机的基本要求对实验系统中的计算机有它的特殊要求,这与科学计算、工程数据处理、管理和商用计算机不同,它以满足数据采集处理和自动控制环境的需要为主要目的,对各种性能的要求,概括起来有以下几点: