长江日流量混沌变化特性研究——Ⅰ相空间嵌入滞时的确定

为了以新途径探索长江水量变化规律并在此基础上做出预测,全面而系统地研究了宜昌站日流量混沌变化特性并建立了新预测模型.重点论述相空间嵌入滞时的确定.分析了传统的自相关函数法和真实矢量场法确定嵌入滞时的优劣,并提出以广义相关函数合理确定嵌入滞时的方法.研究结果表明广义相关函数法是一个合理又可操作的途径.     

高浓度黏性泥石流堆积层理结构中筛积层和粗化层形成机理的研究

根据高浓度黏性泥石流的观测资料,应用不同类型黏性泥石流的流变特性和流体结构的分类指标-流核比,对高浓度黏性泥石流堆积中的混杂层、筛积层和粗化层理结构进行了成因差异分析。侧重分析了砾石质点在高浓度黏性泥石流蠕动流场中作向上垂直运动的魏森伯效应,并在表面富集形成了筛积层的成因,及其它与粗化层结构的区别。     

杭州湾地区浅层气分布及对工程特性的影响

本文以杭州湾大桥工程为重点试图对杭州湾地区浅层天然气在杭州湾地区的形成、分布特征作一概括，分析了浅层气喷发对土层及工程基础产生负摩阻力、沉降等危害，从浅层气的成因机制上找出工程施工中解决浅层天然气的对策(控制性释放)。     

STRUCTURAL CHARACTERISTICS OF THE NIUSHOU MOUNTAIN AND ITS GEOLOGICAL SIGNIFICANCE IN CENTRAL NINGXIA

There are many thrust-related structures occurring in the Paleozoic strata of the Niushou Mountain in the central part of Ningxia Hui Autonomous Region. The fault-related folds are the typical structures in this area. Based on the analysis about these structures and their relationships, the processes by which these structures of the Miboshan Formation were formed are reconstructed, and the strata underwent about three stages of deformation: (1) horizontal shortening, (2) folding, and (3) thrusting. And the fact that the Niushou Mountain is the leading edge of an old thrust sheet was proved, the Niushou Mountain, the Daluo Mountain and the Xiaoluo Mountain together constitute the front part of this old thrust zone, so the Niushou Mountain and the Ordovician strata in the central and southern parts of Ningxia now are likely allochthons. In the period from middle Ordovician to Devonian, the areas of the central and southern Ningxia belonged to the back-arc foreland basin of North Qilianshan orogen, which was adjacent to the continent in the north. In the later part of the early Paleozoic period, the Niushou Mountain was formed after the closure of the back-arc foreland basin.     

POSITIVE INVERSION STRUCTURE OF THE CENTRAL STRUCTURE BELT IN TURPAN-HAMI BASIN

The central structure belt in Turpan-Hami basin is composed of the Huoyanshan structure and Qiketai structure formed in late Triassic-early Jurassic, and is characterized by extensional tectonics. The thickness of strata in the hanging wall of the growth fault is obviously larger than that in the footwall, and a deposition center was evolved in the Taibei sag where the hanging wall of the fault is located. In late Jurassic the collision between Lhasa block and Eurasia continent resulted in the transformation of the Turpan-Hami basin from an extensional structure into a compressional structure, and consequently in the tectonic inversion of the central structure belt of the Turpan-Hami basin from the extensional normal fault in the earlier stage to the compressive thrust fault in the later stage. The Tertiary collision between the Indian plate and the Eurasian plate occurred around 55Ma, and this Himalayan orogenic event has played a profound role in shaping the Tianshan area, only the effect of the collision to this area was delayed since it culminated here approximately in late Oligocene-early Miocene. The central structure belt was strongly deformed and thrusted above the ground as a result of this tectonic event.     

清江水布垭水利枢纽地下厂房围岩变形特性研究

通过在水布垭水利枢纽地下厂房中进行变形试验,研究了厂房区岩体的变形特性,采用反分析法进行粘弹性反分析,反演出地应力、弹性模量及粘性参数,并与现场试验结果进行比较,对反算值进行评价。     

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

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。     

粗粒料流变研究的现状与展望

粗粒料是土石坝的主要填料,高土石坝的流变已成为坝工专家和工程师广为关注的问题,其流变特性是研究的基础。分析了粗粒料流变研究的现状,介绍了长江科学院新取得的进展,并对粗粒料流变研究的前景提出了展望。     

区域沉降数据时空变异特性研究

本文利用变异函数分析方法,探讨了区域沉降数据随时空不同的变异特性,拟合出变异函数的球状模型,分析了沉降数据特征的描述方法,总结出有益的结论。