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退役航空喷气发动机的开发利用途径
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作者 姬永兴 《航空与航天》 2002年第1期16-19,共4页
退役的航空涡喷和涡扇发动机是一种大功率高可靠性的强气流喷射平台,用于进行强气流冲击喷射,也可携带来火物质和其他液滴状,粉末状物质进行承载输送喷射,在强气流吹除、扑灭油气大火和化学事故抢险救援等特殊场所中发挥极好作用。
关键词 退役航空喷气发动机 开发利用 强气流喷射平台 冲击喷射 承载喷射
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Capacity and failure mechanism of laterally loaded jet-grouting reinforced piles: Field and numerical investigation 被引量:7
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作者 HE Ben WANG Li Zhong HONG Yi 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第5期763-776,共14页
This study presents the results of field and numerical investigations of lateral stiffness, capacity, and failure mechanisms for plain piles and reinforced concrete piles in soft clay. A plastic-damage model is used t... This study presents the results of field and numerical investigations of lateral stiffness, capacity, and failure mechanisms for plain piles and reinforced concrete piles in soft clay. A plastic-damage model is used to simulate concrete piles and jet-grouting in the numerical analyses. The field study and numerical investigations show that by applying jet-grouting sur- rounding the upper 7.5D (D = pile diameter) of a pile, lateral stiffness and beating capacity of the pile are increased by about 110% and 100%, respectively. This is partially because the jet-grouting increases the apparent diameter of the pile, so as to en- large the extent of failure wedge and hence passive resistance in front of the reinforced pile. Moreover, the jet-grouting pro- vides a circumferential confinement to the concrete pile, which suppresses development of tensile stress in the pile. Corre- spondingly, tension-induced plastic damage in the concrete pile is reduced, causing less degradation of stiffness and strength of the pile than that of a plain pile. Effectiveness of the circumferential confinement provided by the jet-grouting, however, diminishes once the grouting cracks because of the significant vertical and circumferential tensile stress near its mid-depth. The lateral capacity of the jet-grouting reinforced pile is, therefore, governed by mobilized passive resistance of soil and plastic damage of jet-grouting. 展开更多
关键词 jet-grouting reinforced cast-in-place piles field test finite element analysis lateral bearing capacity lateral stiffness plastic damage failure mechanism
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