灰岩岩体软弱结构面抗剪强度试验研究

Experiment study of the shear strength of weak structural plane in the limestone rocks

通过对灰岩边坡中的软弱结构面进行室内抗剪试验,发现灰岩中的软弱结构面剪切变形呈较理想的"弹塑性"破坏型,剪切变形过程可分为3个阶段,根据剪应力—变形关系曲线上的比例极限、屈服点和峰值点计算得出软弱结构面不同阶段的强度参数值,由c和tgφ试验结果计算得到的边坡稳定性系数与实际情况吻合,说明试验结果是准确的。室内试验方法克服了现场大型剪切试验周期长、耗资多的缺点,对于边坡工程是经济而适用的。

The indoor shear tests are made for the weak structural planes of the limestone slope,and it is found that the shear deformation of the weak structural plane indicates the ideal ‘elastic-plastic.’ The shear deformation has 3 stages.By the shear stress results of proportional limit,yield point and peak point,the strength parameters at different stage can be calculated using the least quadratic method.The calculated stable coefficient of the slope is coincident with the practicality,which proves that the test result is accurate.The indoor test overcomes the disadvantage such as long period,more financing,which is an economical and feasible method for the slope engineering.