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| Fracture Analysis of Underground Rock in Tangshan CITY |
| Su Chunsheng1, Zhu Qingjie2, Su Youpo2 |
| (Construction Bureau of Tangshan City, Tangshan, 063000, China, qjzhu@heut.edu.cn) (Earthquake Engineering Research Center of Hebei Province, Tangshan, 063009, China) |
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Abstract Fracture in underground rock is one of the main reasons that affect the safety and underground engineering construction of city, the prediction of underground rock fracture distribution is very important for city planning. Research on the distribution and mechanism of city’s underground rock fracture is the key of disaster prevention and mitigation. In Tangshan city, the Big Earthquake in 1976 still remained freshly in people’s memory, which caused 240,000 lives lost. Fracture distribution investigation of underground rock and city planning has been paid more attention and recognition by many researchers. Based on elastic mechanics and finite element method, structure stress field of Tangshan city is calculated and analyzed, moreover, calculating model and parameters of the model are introduced. Firstly, six faults are separated as a kind of material, and other part of the region is separated as 5 kinds of material according to basement rock geology distribution. There are five kinds of material, Permian shale, Jixian period dolomite, Ordovician lime stone, Cambrian lime stone and sand stone, take fault as a special material and endow with appropriate mechanical characters. All elements are treated as triangular shell elements, and there are 144 nodes, 251 elements in the region. D values of all kinds of materials are calculated, and stress and energy distribution are solved. Research scope includes centeral, Fengrun, Dongkuang district and Fengnan county of Tangshan city, this scope includes six faults, Dabalizhuang fault, Dachengshanbei fault,Tangshan fault, Douhe fault, Beiziyuan anticline fault and Kaiping syncline fault. Applied force, which loaded on the model, is simplified to concentrate forces. According to Griffith’s criterion, the fracture distribution of underground rock is predicated. The calculating results are analyzed and some suggestions for city planning and disaster prevention and mitigation of Tangshan city are given.
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Received: 31 March 2003
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2003, Vol. 22 
