深厚富水基岩非均质冻结壁力学特性的研究.pdf

论文题目:深厚富水基岩非均质冻结壁力学特性研究专业:岩土工程硕士生:刘海亭(签名)指导教师:杨更社(签名)摘要近年来,随着冻结深度和岩层厚度的不断增加,地压大,温度梯度高,材料呈非线性等问题摆在面前。这给新井的建设带来了很大的困难。一些学者已经认识到冻结壁非均匀性的影响,冻结壁温度场是非均匀的,岩石的力学性质受温度的影响很大。因此,有必要深入开展冻结壁非均匀温度场的演变规律及深厚富水基岩非均质冻结壁力学特性的研究,对于实现深厚富水基岩冻结法施工中冻结壁的厚度计算及施工安全具有一定的指导意义。以彬长集团胡家河煤矿主井冻结工程为背景,采用理论分析、数值模拟等综合研究手段,对“深厚富水基岩非均质冻结壁力学特性”展开研究。以粘弹塑性理论为基础,分析了冻结壁的应力场、承载性能和径向变形规律,采用“分层理论模型”应用于非均质冻结壁计算,较“平均温度”更加合理;同时研究了有限段高条件下,考虑工作面上下端不同约束时,冻结壁径向变形的解析解,并将其应用于胡家河煤矿主井中,对各个影响参数进行了讨论。运用ANSYS有限元软件模拟了冻结壁的温度场演变规律,在数值模拟温度场的基础上,分析了非均质冻结壁的应力场和变形场的规律,并验证了径向分层理论。通过开展深厚富水基岩非均质冻结壁力学特性研究,在温度场的基础上获得了应力场及变形场的演变规律,为深厚富水基岩冻结壁的设计提供了一定参考价值。关键词:非均质冻结壁;径向变形;温度场;力学特性研究类型:应用研究Subject : Researchon The MechanicalPropertiesof InhomogeneousFrozen Wall withWater-abundantBed RockSpecialty: Geotechnical EngineeringName : LiuHai-ting(Signature) Instructor : Yang Geng-she (Signature) ABSTRACTIn recent years, with frozen depth and rock layer thickness increasing, the pressure is big, high temperature gradient, the materials is nonlinear problems such as in front. It brought great difficulties to the construction of new Wells. Some scholars have realized the influence of non homogeneity of freezing wall, the temperature field of frozen wall is uniform, the rock mechanics properties is highly affected by the temperature. Therefore, it is necessary to intensify the non-uniform temperature field of freezing wall evolution regularity and rich water deep bedrock heterogeneity frozen wall mechanical properties research, to realize the deep rich water in bedrock thickness of frozen wall in freezing method construction calculation and have certain guiding significance to the construction safety. Based on Hujiahe main shaftfrozen engineering as the background, adopts the integrated research methods such as theoretical analysis, numerical simulation, the "rich deep water frozen wall rock heterogeneity mechanical characteristics". Based on the viscoelastic