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四、结语
随着国家西部大开发战略的实施，我国将迎来新一轮的基础建设高潮，如青藏铁路以及南水北调西线工程，在这些工程的实施中，普遍存在强烈地震作用下隧道以及边坡岩体的稳定性问题。同时随着工程爆破在岩矿开采、地下洞室的营建以及场平开挖等工程中的广泛应用，也将存在诸如大型水利及能源工程基础爆破开挖中基岩的保护、爆破荷载作用下岩石结构振动安全等问题。另外，在新的战争态势下与国防安全相关的岩石结构防护工事防护性能评估也是目前需要解决的焦点和热点问题。上述问题的解决，在一定程度上要求对岩石材料的动态力学特性进行系统的研究。因此，深入开展岩石材料动态力学特性研究不仅是岩石动力学科发展的需要，也是国家建设和国家安全的迫切需要。
图9 模拟强度与围压关系(三轴)
fig.9 change of simulated strength with confining pressure (triaxial compression)
参考文献
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(4) 鞠庆海.不同加载速率不同围压条件下混凝土的破裂判据与动态性能研究.中国科学院武汉岩土力学研究所硕士学位论文,1993.
(5) zhao j, li hb, wu mb and li tj . dynamic uniaxial compression tests on granite. international journal of rock mechanics and mining sciences, 1999;36(2): 273-277.
(6) li hb, zhao j and li tj. triaxial compression tests of a granite at different strain rates and confining pressures. international journal of rock mechanics and mining sciences ,1999;36(8):1057-1063.
(7) li hb, zhao j and li tj. micromechanical modelling of mechanical properties of granite under dynamic uniaxial compressive loads. international journal of rock mechanics and mining sciences,2000;37:923-935.
(8) li hb, zhao j, li tj and yuan jx. anaylitical simulation of the dynamic compressive strength of a granite using the sliding crack model. international journal for numerical and analytical method in geomechanics. (2001,in press)。
a brief introduction for the experimental and theoretical study on dynamic compressive mechanical properties of a graniteabstract the experimental studies on the mechanical properties of a granite under dynamic compression are briefly introduced in the present paper. the crack model of rock material under dynamic compression is also established. based on the fracture mechanics and mircromechanics, the simulated strength under dynamic compression, as well as the stress strain cures under dynamic uniaxial compression of the granite are obtained. it is indicated that the simulated results agree with the experimental results.
key words granite mechanical properties under dynamic compression
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