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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.

地下开口（例如隧道或网关）周围的岩石可能会失败。通常认为，松动或破坏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，有人指出松动区在适当的条件下可能会恢复强度。例如，如果隧道采用足够强度和刚度的材料支撑，支撑物和围岩之间的松散区域就会被压实和固结。最后，稳定性逐渐提高。目前对于松动带或破坏岩石强度恢复的研究还很少。在这项研究中，通过以下实验程序研究了Dotan（粉砂岩或泥岩）、Tage凝灰岩、Kimachi砂岩和Sanjome安山岩的强度恢复：1）将样品岩石（圆柱形样本）插入小管中，然后通过伺服控制试验机破碎。2）将载荷增加到预定值，然后破碎的岩石在管中压实。将压实岩石从管内拔出，进行单轴压缩或间接拉伸试验。实验结果表明：1）单轴压缩和间接拉伸试验均验证了强度恢复。2）不同岩石的强度恢复程度不同。 4块岩石中，Dotan的强度恢复最为显着。另一方面，三城目安山岩的强度恢复较差。3）风干条件下的强度恢复比水饱和条件下的强度恢复要高得多。