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Study on Strength Recovery of Loosen Zone

松动区强度恢复研究

基本信息

批准号：
13450415
负责人：
OKUBO Seisuke
金额：
$ 4.67万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Rock around an underground opening such as tunnel or gateway may fail. It is usually considered that loosen or damaged zone is gradually extending with elapsed time and stability is gradually decreasing with time going.Recently, it was pointed out that loosen zone might be recovered in strength under a proper condition. For example, if a tunnel is supported with a material of enough strength and stiffness, the loosen zone between supports and surrounding rock is compacted and consolidated. Finally, the stability will be gradually increasing.Very few studies on strength recovery of loosen zone or failed rock have been done up to now. In this study, strength recovery of Dotan (siltstone or mudstone), Tage tuff, Kimachi sandstone and Sanjome andesite is investigated by the following experimental procedures :1) A sample rock (a cylindrical specimen) is inserted into a small pipe and then broken by a servo-controlled testing machine.2) Load is increased to the predetermined value and then the broken rock is compacted in the pipe.3) The compacted rock is pulled out from the pipe and uniaxial compression or indirect tension test is carried out. The experimental results indicate that :1) Strength recovery is verified in both uniaxial compression and indirect tension tests.2) A degree of strength recovery varies from rock to rock. In Dotan, strength recovery is most remarkable among the 4 rocks. On the other hand, Sanjome andesite shows only poor strength recovery.3) Strength recovery is much higher under air-dried condition than water-saturated condition.

隧道或巷道等地下洞口周围的岩石可能会破裂。通常认为，松动或破损区随着时间的推移而逐渐扩大，稳定性随着时间的推移而逐渐降低。最近，有人指出，在适当的条件下，松动区可以恢复强度。例如，如果隧道用具有足够强度和刚度的材料支撑，则支架和围岩之间的松散区将被压实和加固。到目前为止，对松动带或破坏岩层强度恢复的研究还很少。本研究采用以下实验方法研究了多滩(粉砂岩或泥岩)、塔奇凝灰岩、吉马池砂岩和桑霍姆安山岩的强度恢复问题：1)将样品(圆柱形样品)插入小管内，然后用伺服试验机进行破碎；2)将载荷增加到预定值，然后将破碎的岩石压实在管内；3)将压实的岩石从管子中拉出，进行单轴压缩或间接拉伸试验。试验结果表明：1)单轴压缩和间接拉伸试验都证实了强度恢复；2)不同岩石的强度恢复程度不同。在多滩，4种岩石中强度恢复最为显著。另一方面，桑霍姆安山岩的强度恢复较差。3)风干条件下的强度恢复远高于饱和水条件下的强度恢复。