苏南宁镇地区震旦纪至白垩纪的岩石力学性质的系统测试数据浅析

苏南宁镇地区,震旦系至第四系出露完整,研究程度颇深,诸地层的不同特征,以作为华南各地区地层对比之标准而著称。近几年来,随着大规模勘探工作的进行,宁镇地区地层的物性参数、电性参数和力学参数等各种资料,均在不断完善之中。本文试以该区震旦系至白垩系地层的岩石单轴抗压强度等的系统测试数据,对其有关的岩石力学特性进行粗浅地分析。

THE DATA ANALYSES OF SYSTEMATIC TEST OF MECHANIC PROPERTY FROM SINIAN TO CRETACEOIS ROCKS AT NING ZHEN AREA IN SOUTHERN JIONGSU

In accordance with test specification of rock mechanics, authors tested uniaxial compressive strength experiments in which thirty six data have been given Sinian to Cretaceous strength at Ning Zhen area in southern Jiongsu. Twenty three data of internal friction angles and four data from shear and tensil strength experiments have been also reported. The following interpretations can be made for mearsured data:(1) The rock strength of limestones at Ning Zhen area increases with the decreased grain size because the area of contact of mineral grains and so the combining forces are large, but for the clastic rocks, the things are different, that is, the finer the grain size, the weaker the rock strength, because of the increasing of clay contact.(2) All of rocks with high compressive strength have higher shear and tensile. Their compressive strength is five seven times higher than the shear strength, and thirty-forty times higher than the tensile strength.(3) There is a nearly linear relationship between the internal friction angles determined on clayer rocks, feldspathic sandstone, siltstone, sandstone and gravel sandstone, and the corresponding magnitude of the compressive strength.(4) Based on the usual rock classification in engineering geology, the uniaxial compressive strength of rock from Sinian to Cretaceous stratum at Ning Zhen area divided into five orders and three categories, and it can be used by engineering geologists and mining geologists.