某露天矿区全风化花岗岩原位试验研究

针对南方某露天矿区全风化花岗岩进行现场原位试验,选择制备了3组代表性的全风化花岗岩试体,通过设计堆载对试体加载不同垂直荷载的正应力、水平剪应力,直至剪切破坏的试验,对试验数据整理分析,获得正应力σ和正应变ε曲线图、剪应力τ和剪应变ε曲线图,用最小二乘法回归得出抗剪强度曲线图和C、φ值及相关系数R;根据试验施加的单位压力P和实测的岩体变形S,绘制P-S关系曲线,得出弹性(变形)模量。为采场边坡稳定性计算分析提供更符合实际的岩土力学参数,也为工程中遇到类似的风化花岗岩时提供参考。

In-situ test study of fully weathered granite of some open-pit area

Three groups of representative specimens of fully weathered granite are chosen and prepared to conduct the in-situ test in some open-pit area in southern China.The different vertical load and level load are added on the specimens by the design of preloading until the shear failure occurs.Through analysing the test data,the curves of normal stress cr and normal strain e,shear stressτand shear strainεare obtained.The least-square method is used to obtain the shear resistance strength curve and the value of C andΦand correlation coefficient R.The relation curves of specific pressure P and rock deformation S are drawn according the test data and used to calculate elastic modulus.The results can provide more useful geotechnical mechanic parameters for the calculation of stability of slope.These results are also helpful for other similar situations.