Research purposes:With the rapid development of computer technology，it is possible to achieve the complex three-dimensional numerical simulation of underground engineering. However, due to limited processing power and speed of the personal computer and a high cost of supercomputer configuration，the construction of PC cluster system which has a simple structure，low cost and good scalability characteristics is preferred as a normal user. For these reasons，the research on building PC cluster system was carried out，the performance test of PC cluster system was completed and the numerical simulation of Jiaheyuan underground engineering which had multi-units and different working conditions was achieved by using cluster system.
Research conclusions:(1)PC cluster system has high flexibility，and can be expanded in accordance with needs. (2)For the problem which a single computer can handle，PC cluster system is not dominant. But，for larger three- dimensional numerical simulation of geotechnical engineering，PC cluster system has advantages in realizability and operational speed，greatly improving working efficiency.(3)Realization of numerical simulation of Jiaheyuan underground engineering，not only guides the construction of this engineering，but also verifies that PC cluster system has the advantage in large scale three-dimensional numerical simulation. (4)PC cluster systems based on the personal computers make the complex numerical simulation of underground engineering achieve. It provides a convenient and cheap solution for underground engineers.
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