极软质中风化岩嵌岩桩承载力计算方法探讨

对软质中风化岩嵌岩桩承载力,目前规范尚无明确的计算方法,实际工程按JTJ285-2000<港口工程嵌岩桩设计与施工规程>计算的承载力与高应变实测承载力相差较大,其计算方法已不再适用.结合2个实际工程,对极软质中风化岩(饱和单轴抗压强度标准值小于5 MPa)嵌岩桩承载力计算方法进行探讨,提出合理的计算方法.

Calculation of bearing capacity of socketed pile in extremely soft medium weathered rock

For the embedding pile bearing capacity in very soft medium weathered rocks, there are no clearly regulated calculation methods in current codes. In accordance with the rules of "Design and Construction Codes for Port Engineering" the calculated results of the bearing capacity show large deviations against the actually measured result by high strain test, therefore, its ealeulation method is not applicable anymore. On the basis of practices in two projects, this article carried out a preliminary study on the calculation method of embedding pipe bearing eapacity in extremely soft medium weathered rock (with saturated uniaxial compressive strength less than 5 Mpa) .