Suction-controlled experiments on Boom clay     

F. Bernier  G. Volckaert  E. Alonso  M. Villar 《Engineering Geology》1997,47(4):135-338

The understanding of the thermo-hydro-mechanical behaviour of a clay barrier is needed for the prediction of its final in situ properties after the hydration and thermal transient in a radioactive waste repository.

As part of the CEC 1990–1994 R&D programme on radioactive waste management and storage, the CEA (Fr), CIEMAT (Sp), ENRESA (Sp), SCK · CEN (B), UPC (Sp) and UWCC (UK) have carried out a joint project on unsaturated clay behaviour (Volckaert et al., 1996). The aim of the study is to analyse and model the behaviour of a clay-based engineered barrier during its hydration phase under real repository conditions. The hydro-mechanical and thermo-hydraulic models developed in this project have been coupled to describe stress/strain behaviour, moisture migration and heat transfer. A thermo-hydraulic model has also been coupled to a geochemical code to describe the migration and formation of chemical species.

In this project, suction-controlled experiments have been performed on Boom clay (B), FoCa clay (Fr) and Almeria bentonite (Sp). The aim of these experiments is to test the validity of the interpretive model developed by Alonso and Gens (Alonso et al., 1990), and to build a database of unsaturated clay thermo-hydro-mechanical parameters. Such a database can then be used for validation exercises in which in situ experiments are simulated.

The Boom clay is a moderately swelling clay of Rupellian age. It is studied at the SCK · CEN in Belgium as a potential host rock for a radioactive waste repository. In this paper, suction-controlled experiments carried out on Boom clay by SCK · CEN are described. SCK · CEN has performed experiments to measure the relation between suction, water content and temperature and the relation between suction, stress and deformation. The applied suction-control techniques and experimental setups are detailed. The results of these experiments are discussed in the perspective of the model of Alonso and Gens. The influence of temperature on water uptake was rather small. The measured swelling-collapse behaviour can be explained by the Alonso and Gens model.  相似文献   

黄土的物理力学指标与黄土易损性分析研究   总被引：9，自引：1，他引：9       下载免费PDF全文

段汝文  王峻  李兰 《地震工程学报》1997,19(3):81-85

作者多年来在黄土地区进行了考察和勘探并采集了各类黄土样品，在室内外进行了黄土的物理力学性质的试验研究，取得了大量的关于黄土特性的资料．根据这些研究结果，探讨了黄土的物理力学指标与黄土易损性的关系及其区域分布规律，从而研究它与黄土地区的地质灾害和震害的关系．  相似文献   

珊瑚礁工程地质研究的内容和方法   总被引：3，自引：0，他引：3  

赵焕庭  汪稔 《工程地质学报》1997,5(1):21-27

珊瑚礁工程地质研究的主要内容为珊瑚礁自然地质条件、珊瑚礁岩土物理力学性质和珊瑚礁混凝土料问题。除了通常的工程地质研究方法外, 着重介绍珊瑚礁工程地质研究的钻探、触探和地球物理勘测方法。  相似文献   

旋喷固结体的物理力学性状研究     

周勇  徐进 《地质灾害与环境保护》1997,(3)

通过单轴抗压试验、剪切试验、变形试验及渗透性试验等方法，对旋喷固结体的物理力学性状和渗透性进行了研究。结果表明：旋喷固结体具有良好的物理力学性质和较低的渗透性，可完全改变天然土的性质。  相似文献   

假玻状岩研究的新进展   总被引：1，自引：0，他引：1  

张桂林 《地质科技情报》1997,16(2):24-28

综述了假玻状岩研究的主要进展，假玻状岩形成的磨擦熔融机制与机械磨碎机制实际上不是过去所认为的是两种互相排斥的机制，而是在假玻状岩形成过程中两个密切相关的阶段，磨碎作用是熔融发生的必要的前提条件；假玻状岩不仅可以形成于脆性域（与碎裂岩相关），而且可以形成于脆韧性过渡区（与糜棱岩相关），形成的最大深度可达１８ｋｍ；假玻状岩是围岩中矿物选择性熔融的产物，矿物优先熔融的顺序（从易到难）为：层状硅酸盐、链状  相似文献   

月壤的物理和机械性质   总被引：46，自引：0，他引：46  

郑永春  欧阳自远  王世杰  邹永廖 《矿物岩石》2004,24(4):14-19

月壤是在O2、水、风和生命活动都不存在的情况下，由陨石和微陨石撞击、宇宙射线和太阳风轰击、月表温差导致岩石热胀冷缩破碎等因素的共同作用下形成的。月壤独特的形成过程，加上独特的月表环境，使月壤在粒度分布、颗粒形态、颗粒比重、孔隙比和孔隙率、电性和电磁性质、压缩性、抗剪性、承载力等方面均与地球土壤存在较大差异，这些参数的平均值和最佳估计值，可以作为月表机械设计和操作、宇航员装备设计、月球着陆场选址的主要依据，对月球资源开发和利用以及月球基地建设具有极其重要的意义。  相似文献   

水泥搅拌桩与锚杆组合支护结构的力学参数研究   总被引：1，自引：0，他引：1  

赵剑豪  陈振建  方家强 《岩土力学》2004,25(Z2):265-270

水泥搅拌桩--锚杆组合支护结构是一种新型的组合支护结构,笔者采用有限元方法进行各相关力学参数研究,分析了该组合支护结构的受力特性及变形性态.通过计算结果与实测数据的比较,表明本文所得结论对该组合支护结构的应用有一定的指导价值.  相似文献   

Émergence de la complexité dans un modèle simple de comportement mécanique des roches     

David Amitrano 《Comptes Rendus Geoscience》2004,336(6):505-512

We propose a mechanical model for the behaviour of rocks based on progressive damage at the elementary scale and elastic interaction. It allows us to simulate several experimental observations: mechanical behaviour ranging from brittle to ductile, fractal structure of the damage, power-law distribution of the damage avalanches. These macroscopic properties are not incorporated at the elementary scale, but are the results of the interaction between elements. This emerging complexity permits us to consider the strain rock process as a complex system characterized by non-linear dynamics. To cite this article: D. Amitrano, C. R. Geoscience 336 (2004).  相似文献   

Soil–rock-forming processes and engineering mechanical properties of the ancient gravel stratum near Nanjing, China     

Jia Xia 《Engineering Geology》2005,78(3-4):209-214

The ancient gravel stratum near Nanjing, China, is a major stratum of Cenozoic age along the middle–lower reaches of the Yangtze River. This paper first presents a typical geological profile and material composition of the ancient gravel stratum, and then discusses its geologic origin, soil–rock-forming processes, engineering mechanical properties, and their relations. These analyses are useful for city planning, geotechnical engineering, construction, and characterization of the geological environment in the Nanjing area.  相似文献   

The Effect of Machine Behaviour and Mechanical Properties of Intact Sandstone Under Static and Dynamic Uniaxial Cyclic Loading   总被引：5，自引：0，他引：5  

M. N. Bagde  V. Petroš 《Rock Mechanics and Rock Engineering》2005,38(1):59-67

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