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开挖和降雨条件下类岩堆体隧道边坡稳定性试验研究
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Abstract:
类岩堆体隧道边坡稳定性是山区高速公路设计和建设中的关键问题之一，且由于西部交通的需求迫切需要解决。本文设计了由钢结构和有机玻璃构成的模型试验装置，并开展了类岩堆体隧道边坡开挖和降雨下的稳定性相似试验，试验装置尺寸为1.6 m × 1.2 m × 0.6 m。基于相似理论，土体和块石按实际级配随机混合浇筑成类岩堆体隧道边坡体。试验结果表明：1) 降雨相比单一的开挖对类岩堆体隧道边坡的影响更加显著，水平位移和竖直位移表现出同样的规律；2) 竖直位移随着开挖深度逐渐减小，且没有出现位移突变的情况；3) 在降雨条件下的破坏多为拉裂–滑动破坏。
The stability of talus-type rock mass slope is one of the key problems in the design and construc-tion of expressway in mountain area, and it is urgent to be solved due to the needs of west trans-portation. In this paper, a model setup is designed to carry out a reduced scale model test of ta-lus-type rock mass slope stability. The dimension of the model tank is 1.6 m long, 1.2 m high and 0.6 m wide, respectively. And it is mainly constructed by thick perspex and fixed steel plates. Based on the similarity theorems, model soil and rock debris are mixed stochastically to simulate talus-type slope of a typical tunnel slope. The model test results show that: 1) rainfall compared with single excavation has a significant effect on the stability of talus-type slope, and the horizontal and vertical displacements caused by rainfall are both much larger than those caused by just excavation; 2) in addition, the vertical displacement reduces with the increase of depth from the ground surface and few local slumps occur on the excavating slope; 3) the failure mode is usually tension-sliding under rainfall state.
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