Full
Outline
Aiming at the calculation problem of soil pressure in foundation pit engineering, an analytical method for soil pressure was established, and the influence effects of various factors were analyzed. Based on the basic assumptions of Coulomb's soil pressure theory, and fully considering the friction angle between the wall back and backfill, the soil internal friction angle, foundation pit excavation depth and other factors, a soil pressure calculation model was constructed, and quantitative formulas for soil pressure and its influence range induced by excavation disturbance were proposed. Through the sensitivity analysis of influencing factors, the influence order of each factor on the excavation influence range was clarified under the conditions with or without steel supports. The variation laws of the influence range under different working conditions and excavation stages were studied, and comparative verification was carried out. The results show that the distribution patterns of soil pressure along the foundation pit excavation depth from the two methods are consistent, which verifies the accuracy of the model. Sensitivity analysis shows that the excavation depth of a foundation pit exerts the most significant effect on the excavation influence range without supports, and the excavation depth of the foundation pit remains the main controlling factor after steel supports are installed. The model proposed in this paper can quantitatively analyze the soil pressure distribution and disturbance influence range during the foundation pit excavation of a 110 kV substation as part of a supporting project of an energy development base in Hefei, Anhui Province. The results can provide a theoretical reference for the design and analysis of foundation pit engineering of related energy and mineral resources development infrastructure.
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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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