基于Hoek-Brown准则的岩石地基承载力

The Bearing Capacity of Foundation Soil of Rock Mass Based on Hoek-Brown Criterion

确定岩体地基承载力的方法主要有岩基荷载试验方法、对岩石饱和单轴抗压强度乘以折减系数的规范法和查表法等。其中岩基荷载试验法结果较准确,但试验设备要求高,试验周期长,费用比较大,仅对少数重要建筑勘察采用。规范法比较简单方便,费用低,但折减系数的确定缺乏理论依据,精度不高。本文依据Hoek-Brown准则,利用岩石的单轴抗压强度,确定了岩体在不同质量程度下的地基极限承载力,并对此做出了说明。同时利用这一方法计算了部分岩石的岩体地基极限承载力表。

At present, the most common ways to confirm the bearing capacity of foundation soil of rock mass are batholith load test method, to multiply standard values of rock-saturation uniaxial compressive strength by reduction factor and look-up table method. In this paper, the bearing capacity of foundation soil of rock mass with different quality is presented, making use of the uniaxial compressive strength of rock, based on the Hoek-Brown criterion and the explanations are given. At the same time, taking advantage of the new method, the paper offers a table about the bearing capacity of foundation soil of a part of rock mass.