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桩端阻力的大小直接与岩石单轴抗压强度成比例,通常情况下,其计算方法是完整岩石单轴抗压强度与承载力系数的乘积,而承载力系数的大小与岩石种类、嵌岩深度、岩石质量等级有直接关系。通过对贵阳地区某工程14个泥(砂)岩端阻载荷试验,分析了岩石种类和风化程度对桩的极限端阻力的影响。结果表明,泥岩风化程度不同,其桩端载荷-位移曲线的初始直线段斜率相差不大;计算出来的极软岩(泥岩)承载力系数远大于软岩(砂岩)。
The size of the pile tip resistance is directly proportional to the uniaxial compressive strength of the rock. Usually, the calculation method is the product of the uniaxial compressive strength of the intact rock and the bearing capacity coefficient. The bearing capacity coefficient is similar to the rock type, Depth, rock quality level is directly related. Through the test of rock end resistance load of 14 muds (sand) in an engineering project in Guiyang, the influence of rock type and degree of weathering on the ultimate resistance of pile is analyzed. The results show that the degree of weathering of mudstone is different, and the slope of the initial straight line segment of pile - end load - displacement curve is not much different. The calculated bearing capacity coefficient of extremely soft rock (mudstone) is much larger than soft rock (sandstone).