地质基础理念之我见

任-侵位的岩浆体，在结晶分异、固化成岩过程中，一般都可分为：已结晶的固相岩体、正(半)结晶的可塑相岩体及未结晶的熔融相岩浆3部分．此时，若发生了地壳运动，地壳运动的构造作用力。使正(半)结晶的可塑相岩体发生可塑相变形，形成片麻化岩体；地壳运动(包括地震)时的构造作用力为脉动性质的挤压作用力；岩体发生片麻化的地壳运动，又使已结晶的固相岩体和围岩发生断裂活动，形成了断裂带控矿、容矿构造；未结晶的熔融相岩浆再度上升侵位，便形成了小侵入岩体控矿构造．残浆的形成与排出，控矿构造的发生、发展与控矿过程，都是在这次地壳运动过程中完成的．因此，对这次地壳运动可称成矿作用．     

斜坡地下水渗透力计算与稳定性分析

分析了基岩山区斜坡区域地下水的渗流模式,指出斜坡堆积体中地下水的一般特征,根据这个特征建立了条分法中斜坡渗透力的简易计算方法,用于改进传统的剩余推力法和Sarma法。该方法不需要额外补充参数,易于工程勘察人员掌握。提出通过极限状态考察斜坡安全储备的思路,对三峡库区某滑坡在水库蓄水前后的稳定性和安全储备进行了评价,结果表明传统方法计算的稳定性系数过高,当库水位快速下降时滑坡稳定性减弱,地下水渗透力是其中不可忽视的影响因素。     

大型高速滑坡滑动过程中碰撞特性的试验

首次提出了滑坡岩体高速碰撞模型实验方法。通过实验,研究了滑体碰撞解体后不同速度段岩体体积的分布规律,得出了加速块体所占比例基本与滑体体积及碰撞速度无关,而个别块体获得的加速效应与滑坡体积及碰撞速度有明显的正相关关系。     

结构设计地震作用效应影响因素及规律分析

基于现行《建筑抗震设计规范》（GB50011－2001），本文分析了现行抗震设计中影响结构设计地震作用效应的主要因素，以规则平面框架对例对新旧规范影响结构设计地震作用效应的因素进行了对比，给出了其间的重要变化和基本规律。     

地震周期的存在及形成机制讨论

根据1900～2000年中国大陆、台湾及全球地层记录及前人的研究，论证了地层周期存在的可能性及形成机制。作者认为，是太阳活动、月球运动轨道及各行星运动轨道的周期性变化，通过磁力及万有引力改变地球内部物质的分布，从而引起地球自转速度的周期性变化，最终致使地展出现周期性的活跃期及平静期。     

Predictive instantaneous optimal control of inelastic structures during earthquakes

A new inelastic structural control algorithm is proposed by incorporating the force analogy method (FAM) with the predictive instantaneous optimal control (PIOC) algorithm. While PIOC is very effective in compensating for the time delay for elastic structures, the FAM is highly efficient in performing the inelastic analysis. Unlike conventional inelastic analysis methods of changing stiffness, the FAM analyzes structures by varying the structural displacement field, and therefore the state transition matrix needs to be computed only once. This greatly simplifies the computation and makes inelastic analysis readily applicable to the PIOC algorithm. The proposed algorithm compensates for the time delay that happens in practical control systems by predicting the inelastic structural response over a period that equals the magnitude of the time delay. A one‐story frame with both strain‐hardening and strain‐softening inelastic characteristics is analyzed using this algorithm. Results show that the proposed control algorithm is feasibile for any inelastic structures. While the control efficiency deteriorates with the increase in magnitude of the time delay, the PIOC maintains acceptable performance within a wide range of time delay magnitudes. Finally, a computer model of a six‐story moment‐resisting steel frame is analyzed to show that PIOC has good control results for real inelastic structures. Copyright © 2003 John Wiley & Sons, Ltd.     

再论印度—亚洲大陆碰撞的启动时间

利用沉积响应来识别印度－亚洲大陆碰撞启动时间是最直接和有效的方法之一。西藏仲巴错江顶群被甄别为碰撞型三角洲沉积，曲下组可能代表了碰撞启动时期的建造，藏南定日的海相白垩－古近系沉积演化，锶和碳同位素变化也支持两大陆碰撞启动时间大约在K／T界线时期，对比喜马拉雅西段碰撞启动时间并考虑大印度北缘失掉的宽度，提出两大陆量可能的碰撞启动时间是65Ma左右。     

虚拟加工环境中的工件动态建模方法研究

提出并实现了基于平面纹理映射的基元立方体构造方法，以之为动态结点建立了动态八叉树结构，实现了支持变精度动态建模的自相似递归算法。该算法确保离正在加工的部位更近的区域有更高的精度，并采用C^ Builder和OpenGL构造了一个集成于虚拟加工环境的可加工工件模型。     

Les manifestations tectoniques synsédimentaires associées à la compression éocène en Tunisie : implications paléogéographiques et structurales sur la marge Nord-Africaine

In central Tunisia, a synsedimentary tectonic episode has been pointed out through the tectonic movements affecting the Late Palaeocene–Early Eocene successions. This tectonic episode has controlled, to a large extent, the palaeogeographic setting of the area during that period and confirmed the important effect induced by the Pyrenean shortening phase on the edge of the African plate, which obviously has witnessed a common history with the southern part of the European plate. To cite this article: A. El Ghali et al., C. R. Geoscience 335 (2003).     

Tectonics of the western margin of the Shan plateau (central Myanmar): implication for the India–Indochina oblique convergence since the Oligocene

We present new data and interpretations on the Neogene tectonics of the Shan scarp area (central Myanmar) and its relationship with the India–Indochina oblique convergence. We describe ductile and brittle fabrics associated with the major features in this area, the Mogok Metamorphic Belt (MMB), the Shan scarp and the Sagaing fault. From these data we identify a succession of two tectonic regimes. First, a dominant NNW–SSE-trending extension, marked by ductile stretching that characterizes the MMB, and associated N70E brittle normal faults. Later, from Middle or Upper Miocene to the Present, these structures were cross-cut by brittle right-lateral faults, among which the most important are the N20W transpressive Shan scarp fault zone and the N–S Sagaing fault. To explain this transition from a dominant transtensive to a transpressive stress regime, that occurred during Miocene, we place our data within a larger geodynamic context. We suggest that, like the intraplate deformation in the Indian Ocean, the end of spreading in the South China sea, the opening of the Andaman basin or the end of subduction within the Indo-Burma range, the change in the tectonic regime in central Myanmar could be in response to a major Miocene regional plate kinematic reorganization.