桥梁勘察中红砂岩单轴抗压强度标准值的计算方法探讨

Discussion on the Calculation Method of Standard Value of Red Sandstone Uniaxial Compressive Strength in the Bridge Site Survey

岩石单轴抗压强度标准值,是桥梁桩基工程设计中的重要指标。在桥梁工程地质勘察过程中,由于红砂岩是一种软岩,计算红砂岩石的单轴抗压强度标准值时,其单轴抗压强度的离散性大,这直接关系着单轴抗压强度标准值,其值的大小将直接影响桥梁桩基的桩径大小和长短。对此,以江西境内红砂岩为例,分析了红砂岩的单轴抗压强度值变化大的原因,通过实例,探讨在对红砂岩的试验数据进行统计计算时采用的方法和原则,使其单轴抗压强度标准值较为合理。

The standard value of uniaxial compressive strength of rock is an important indicator of bridge pile foundation engineering design. In the bridge engineering geological investigation,to calculate the standard value of uniaxial compressive strength of red sandstone,as the red sandstone is a type of soft rock,its discreteness of uniaxial compressive strength is great,which is directly related to the standard value of uniaxial compressive strength and directly related to pile diameter and length of bridge pile foundation. Therefore,take red sandstone in Jiangxi for example,this paper analyzes the reason of great change of uniaxial compressive strength of red sandstone and discusses the method and principle adopted to make statistics of test data of red sandstone so as to get reasonable standard value of uniaxial compressive strength.