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For researching crack initiation condition and water injection pressure needed, this paper built up a mechanics model of crack tip based on crisp fracture theory of compound crack.
为研究初始裂缝尖端起裂的条件和所需注水压力，依据断裂力学的复合型裂纹的脆性断裂理论，建立了裂缝尖端力学模型，给出了计算方法。
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