Full
Outline
Aiming at the support problem of large deformation of surrounding rock in deep high ground stress roadway, a kind of compressible concrete-filled steel tube support structure (referred to as "compressible support") was proposed. Firstly, a comparison test of compressible similar materials was carried out, and PVC foam was determined to be applicable as the compressible similar material for simulation tests. Secondly, the similar simulation test of the compressible support was carried out, and the stress-time and load-displacement curves of the whole process of static load were obtained. The evolution of compressible support, initiation and propagation of concrete cracks was monitored. Three mechanical response stages of the compressible support were revealed: the elastic deformation stage, stable yielding stage and rigid stage after yielding. The test results show that the peak stress of the surrounding rock of the roof and floor is approximately 0.7 MPa, and the peak stress of the surrounding rock of the left and right sides is approximately 1.4 MPa. The stress of the surrounding rock is transferred to the depth, the supporting model does not experience overall instability and deformation, and the support is bent, but the structure is still intact. The compressibility of PVC foam measured is approximately 77%, indicating that the support achieves a favorable yielding effect. The field application results show that the maximum displacement of the roof and floor of the surrounding rock is 216 mm, and the compressibility of the compressible support is about 72%. The compressible support achieves favorable supporting performance, and the support structure can effectively coordinate the collaborative deformation of the surrounding rock and support. The research results can provide reference for the support design and engineering application of the compressible support.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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