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Abstract Broken rock shows obvious creep properties. Creep causes the continuous variation of porisity as well as the seepage characteristics. The variation law of saturated broken mudstone porosity during creep process is studied by using the self-developed multiphase coupling creep test device. The results show that during the creep process of the broken mudstone，the porosity has a negative exponential relation with time，and the complete process can be divided into several obvious stages；when the load is the same，the smaller the mudstone particle size is，the smaller the variation of the mudstone porosity is，and the larger the final porosity is. As the load increases，the difference of the porosity caused by the different mudstone particle sizes becomes smaller；under the condition of the same mudstone particle size，the porosity of the mudstone has a quicker variation under bigger loads.
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Received: 16 October 2008
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