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通过对大量嵌岩桩现场试桩资料的统计分析得出,试桩荷载下软岩嵌岩桩承载特性主要表现为端承摩擦桩,亦具有摩擦端承桩或端承桩的特性;嵌岩桩侧阻与端阻的发挥是异步的,即侧阻先于端阻发挥,建议将侧阻和端阻分别取不同的安全系数来设计单桩竖向承载力;嵌岩桩的破坏特征表现为突然破坏,破坏的原因有2种:①桩体发生破坏;②桩的嵌岩部分发生破坏,发生破坏的位置有桩岩界面、桩周围岩;现场试桩资料表明,即使是软岩嵌岩桩其破坏形式亦有可能是桩体材料破坏,因此,嵌岩桩设计时,尚应考虑桩身强度对其承载力的控制作用;最后对现行各行业规范进行了分析,指出一些仍需完善和探索的地方。
Through the statistical analysis of a large number of rock-fill piles in-situ test data, it is concluded that the load-bearing characteristics of rock-socketed piles under test-pile load mainly include end bearing friction piles and also the characteristics of friction end- The lateral resistance of the pile and the end resistance play an asynchronous role, that is, the lateral resistance precedes the end resistance. It is suggested that the vertical and lateral bearing capacities should be designed with different safety factors. The damage characteristics of the rock-socketed pile There are two reasons for the sudden destruction and destruction: (1) the pile body is destroyed; (2) the rock-socked part of the pile is destroyed; the pile-rock interface and the rock around the pile are damaged; Therefore, the design of rock-socketed piles should take into account the control effect of the pile strength on its bearing capacity. Finally, the author analyzes the current industry specifications and points out that some of the still-needed Perfect and explored place.