地下空腔及应力释放区修复膨胀材料性能评价

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI:10.12814/JKGSS.2018.17.4.141
Kicheol Lee, Byeong-Hyun Choi, J. Bak, Dongwook Kim
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引用次数: 0

摘要

近年来,由于地下空腔引起的地面沉降越来越多。因此,强调了恢复地下空腔周围应力释放区的重要性。应力释放区由刚度和压实度极低的低密度土构成,可能导致上覆地面额外的空腔扩张和塌陷。因此,本研究验证了膨胀材料加固地下洞室周围应力释放区修复方法的适用性。研究了膨胀材料的基本物理性能和膨胀特性。研制了模拟应力释放区的实验装置,用于研究膨胀材料对应力释放区的影响。数值分析中采用弹簧模拟应力释放区。在数值模拟中,改变了地下空腔与膨胀物体积比、应力松弛程度和空腔形状等因素,并根据数值分析结果对应力释放区行为进行了分析。分析变量是相互影响的因素。确定了膨胀材料注入地下空腔后,地下空腔的充填情况和应力释放区的恢复能力。
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Evaluation of Performance of Expansive Material for Restoration of Underground Cavity and Stress Release Zone
Recently, the number of ground subsidence resulting from underground cavity has been increased. Accordingly, the importance of restoration of stress release zone around the underground cavity has been emphasized. The stress release zone is composed of low density soils having extremely low stiffness and degree of compaction, which can lead to additional cavity expansion and collapse of overlying ground. Therefore, in this study, the suitability of restoration method of underground cavity using expansive material for reinforcement of stress release zone around the cavity is verified. The basic physical properties and expansion characteristics of the expansive material were examined. The experiment equipment capable simulating of stress release zone was developed and is used to investigate the effect of expanding material on stress release zone. The stress release zone was simulated using the spring in numerical analysis. The factors of the volume ratio of the underground cavity to the expansion material, the degree of stress relaxation, and the shape of the cavity were varied in numerical simulations, and the behavior of stress release zone was analyzed based on the numerical analysis results. Analysis variables are factors that affect each other. Also, filling of underground cavity and capacity of restoration of stress release zone were confirmed when the expansive material was inserted into underground cavity.
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