节理化岩体开采沉陷的损伤统计研究

构造了一台无初始节理和一套有初始节理的岩体采动沉陷相似材料模型，进行模拟开挖实验，系统研究初始节理对岩体采动沉陷的影响规律，然后运用损伤力学理论研究节理在岩体采动沉陷中的作用，建立了地表移动特征值与岩体损伤变量的经验关系．     

岩体施工过程损伤演化预测的时变力学分析

由建立的岩体损伤本构模型，依据时变力学理论对岩体进行不同施工路径下的分步开挖计算，并对施工过程中各点损伤演化历程进行计算机仿真模拟，以预测后续开挖的损伤状态及寻求较优施工步序。理论及算例分析均表明：存在损伤演化时，不同施工步序下岩体终应力位移和损伤状态均不同，设计与施工应进行损伤演化的时变力学分析，以保证施工安全。     

基于非线性统一强度理论的裂隙岩体圆形隧道扩张问题的弹塑性研究

由于节理岩体具有复杂的力学特性,因此节理岩体圆形隧道扩张问题的弹塑性解要复杂得多。节理岩体的力学特性可以很好地用考虑了岩体结构的强度参数m,s和α以及中间主应力影响的非线性统一强度准则来表达。本文根据非线性统一强度准则确定了瞬时摩擦角,强度参数m,s和α是瞬时摩擦角的函数,获得了节理岩体圆形隧道扩张问题的弹塑性解和支护应力的封闭形式的理论解,并给出了算例。     

偏压条件下大型地下厂房围岩变形稳定性分析

根据下坂地水库协力波斯电站工程建设实际,在现场调查和电站区勘探、测试资料基础上深入分析地下厂房地质条件,建立了能够反映厂区地形地貌、岩体结构和地应力状态的三维数值模型。根据地应力实测资料反演拟合初始地应力场背景值,采用三维弹塑性有限差分法模拟了在偏压条件下地下厂房、主变室开挖过程中围岩变形和稳定性状况,揭示了各开挖阶段应力的集中部位和围岩潜在破坏部位,这对于工程具有重要的指导意义。     

南昆线南那段红土类型划分及微观特征研究

本文在野外调查的基础上,根据母岩岩性和红土化作用程度对南那段红土作了初步分类,并对几种主要的红土的物质成分和微观结构特征进行了研究。     

节理岩体的分维特征及其工程地质意义

本文用分形理论,对节理网络分布和粗糙度曲线进行分形分析。结果表明,节理的空间分布和粗糙度曲线具自相似性;分维是一个表征岩体强度、岩体损伤程度、岩体质量及节理粗糙程度的几何参数,并可用于评价岩体稳定性、断裂体系活动性及划分风化卸荷带等。     

Anisotropic dilations of shift‐invariant subspaces and approximation properties in

Let A be an expansive linear map in . Approximation properties of shift‐invariant subspaces of when they are dilated by integer powers of A are studied. Shift‐invariant subspaces providing approximation order α or density order α associated to A are characterized. These characterizations impose certain restrictions on the behavior of the spectral function at the origin expressed in terms of the concept of point of approximate continuity. The notions of approximation order and density order associated to an isotropic dilation turn out to coincide with the classical ones introduced by de Boor, DeVore and Ron. This is no longer true when A is anisotropic. In this case the A‐dilated shift‐invariant subspaces approximate the anisotropic Sobolev space associated to A and α. Our main results are also new when S is generated by translates of a single function. The obtained results are illustrated by some examples.     

On the complexity of expansive measures

We prove that the existence of positively expansive measures for continuous maps on compact metric spaces implies the existence of e 0 and a sequence of(m, e)-separated sets whose cardinalities go to infinite as m →∞. We then prove that maps exhibiting such a constant e and the positively expansive maps share some properties.     

低化学稳定性复杂组分含磷铝硅酸盐玻璃体结构——含磷铝硅酸盐玻璃体结构模型与肥料开发

基于玻璃体无规则网络学说,建立了包含P2O5,K2O,CaO,MgO,SiO2,Fe2O3,FeO,Al2O3,B2O3,MnO,CuO,ZnO,NiO,MoO2,CoO和TiO2低化学稳定性复杂组分的玻璃体结构模型,推导出扩展的玻璃结构因子(Ob/Yb)ex及其计算式.对高效利用低品位磷矿、磷矿选矿尾矿、难溶性钾矿和低品位磷钾矿制造能为农作物吸收的玻璃体肥料具有一定的理论意义和应用价值.     

The measurement of saturated rock electrical conductivity at lower crustal temperatures and high pressures

Abstract

A method has been developed to measure the electrical conductivity of electrolyte saturated rocks under simulated lower crustal temperatures and pressures. The method uses a metal sleeved sample, and a guard-ring electrode system has been used to minimise leakage currents through the sleeve. Seals were developed to mate the metallic and ceramic parts of the cell.