深部破碎岩体变形模量的一种新型试验方法及工程应用

A New Experimentation Method and An Example of Deformation Modulus for Deep Cracked Rock Mass

岩体的变形模量是表征岩体抗变形能力的一个重要参数。对于深部破碎岩体的变形模量,采用传统的现场试验法或钻孔弹模法获得其变形参数有一定的局限性。因此,采用一种新开发的试验手段:将现场钻孔中取得的深部破碎岩体试样带回室内,放入MTS中进行三轴试验,记录相应的位移和应力;同时推导了一套配套的理论计算公式,利用室内试验的方法获得了从钻孔中取得的深部破碎岩体的变形模量。采用上述方法对实际水电工程坝基深部破碎带岩体的变形模量进行试验计算,并对试验得到的变形模量结果进行检验分析。其结果表明:采用两种方法获得的深部破碎岩体变形模量值差别一般在10%以内。

The deformation modulus is an important parameter to denote ability of anti-deformation of rock mass and is used to many projects.It is difficult to obtain deformation modulus of deep cracked rock mass by making use of conventional experimentation method or borehole elasticity modulus method.So according to a new experimentation method and corresponding formula,deformation modulus of deep cracked rock mass is obtained by using of indoor test：putting the deep cracked rock mass into MTS to test and note the displacement and stress,taking cracked rock mass in dam foundation as an example,computing and analyzing deformation modulus of deep cracked rock mass.After test and calcuation of deformation modulus of the rock mass from deep fructured zone in dam site of hydropower plants,it is proved that the difference of result of deformation modulus is less than 10% usually by using of two methods.The new experimentation method achieves good effect.