Full
Outline
In the future, China will implement manned lunar landing missions, establish a permanent base on the lunar surface, and realize the exploitation and utilization of lunar mineral resources. To address the issue of determining bearing capacity of lunar soil during lunar surface construction, a method was proposed to use small-scale laboratory loading tests to deduce the allowable bearing capacity and settlement of lunar soil simulant under large-scale foundations was proposed. Firstly, plate loading tests were performed on lunar soil simulant with a compactness of 78% using circular loading plates with diameters of 6 cm, 8 cm, and 10 cm, respectively. The measured load-settlement (p-s) curves of the lunar soil simulant were obtained, and through curve fitting, the initial tangent modulus and ultimate bearing capacity were extracted. The tangent modulus method was adopted to establish the relationship between the tangent modulus of the lunar soil simulant and its initial tangent modulus, applied additional stress, as well as ultimate bearing capacity. Furthermore, based on the settlement calculation theory, the p-s curves under foundations of arbitrary sizes were calculated. Validation against the results of small-scale load tests demonstrated a good agreement between the calculated p-s curves and the measured ones. Secondly, the proposed method was employed to compute the p-s curves under large-scale foundations, and the allowable bearing capacity of large-scale foundations was comprehensively characterized by integrating the ultimate bearing capacity criterion and settlement control method. The analysis results of bearing capacity of lunar soil simulant under large-scale circular and square foundations indicates that with the increase in foundation size, the allowable bearing capacity of the lunar soil simulant under both types of loading plates increases. Additionally, the allowable bearing capacity of the lunar soil simulant under square loading plates is higher than that under circular ones of the same size. It can be inferred from the calculated p-s curves that the settlement of the lunar soil simulant corresponding to the determined allowable bearing capacity meets the engineering requirements. According to the standard size of circular loading plates used in conventional loading tests, the allowable bearing capacity of the lunar soil simulant employed in this study has been deduced to be 122 kPa. The proposed method for determining the allowable bearing capacity of lunar soil simulant provides a scientific approach and theoretical basis for the determination of lunar soil bearing capacity during the construction of lunar bases and the exploitation of lunar mineral resources.
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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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