深层Boom粘土块样品中的吸力效应
Suction effects in deep Boom clay block samples
摘要：
在研究深层核废物处理的范围内，已经并正在对来自位于Mol（比利时）的一个地下研究实验室的一种硬粘土进行广泛的研究，该实验室被称为Boom clay。通过表征粘土的保水性和膨胀性能，研究了深Boom粘土块样品中的抽吸效应。所获得的数据允许估计样品的初始吸力，这是合理的兼容与在223米的深度的应力的原位状态。在加载和卸载过程中的吸力和应力变化之间的关系也进行了检查运行oedometer测试与吸力测量。得到的比值s/σ 'v（s为吸力，σ'v为有效垂直应力）的范围相当宽（0.61 - 1），不同于Bishop等人（1974）提出的值。最后，在各向同性应力下的吸力释放的效果接近估计的样品吸力进行了研究。观察到轻微的膨胀（1.7%），进一步压缩提供了令人满意的超固结比值，证实了Graham等人（1987）提出的在将膨胀样品与水接触之前采取一些预防措施的建议。本研究中收集的各种实验数据最终证明了所用块体样品的相对良好的保存状态。
英文摘要：
Extensive investigations have been and are being carried out on a stiff clay from an underground research laboratory located at Mol (Belgium) called Boom clay, in the context of research into deep nuclear waste disposal. Suction effects in deep Boom clay block samples were investigated through the characterisation of the water retention and of the swelling properties of the clay. The data obtained allowed an estimation of the sample initial suction that was reasonably compatible with the in-situ state of stress at a depth of 223 m. The relationship between suction and stress changes during loading and unloading sequences were also examined by running oedometer tests with suction measurements. A rather wide range of the ratio s/sigma 'v (being s the suction and sigma 'v the effective vertical stress) was obtained (0.61 - 1), different from that proposed by Bishop et al; (1974). Finally, the effect of suction release under an isotropic stress close to the estimated sample suction was investigated. A slight swelling (1.7%) was observed and further compression provided a satisfactory value of the overconsolidation ratio confirming the suggestions of taking some precautions before putting a swelling sample in contact with water as suggested by Graham et al. (1987). The various experimental data gathered in this study finally evidenced a relatively good state of conservation of the block sample used.
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