【作者】 郭永成；

【导师】 李建林； 陆付民；

【作者基本信息】 三峡大学 ， 水工结构工程， 2005， 硕士

【摘要】 本文在充分认识了国内外岩体渗流、卸荷岩体力学特性以及岩体渗流与岩体卸荷力学特性相互作用的研究现状的基础上,总结了岩体渗流的相关特性,并首次提出了卸荷岩体水力学的概念。对岩体工程按其所处的位置和工程力学状态分别进行了分类,分析了卸荷岩体的力学特点,并指出不同的力学状态应采用不同的力学理论与方法进行研究和分析。对卸荷岩体力学与加载岩体力学进行了对比,并指出了它们之间存在的本质区别。通过对裂隙岩体渗流与卸荷力学相互作用的分析,得出了渗透系数与卸荷应力、应变间的关系式。总结了目前岩体水力学参数、岩体渗流与应力耦合参数、岩体力学参数的确定方法,并详细地介绍了分级的数值模拟方法。介绍了目前岩体渗流常用的计算模型,建立了卸荷条件下的应力场与渗流场耦合分析的数学模型。最后,通过对隔河岩电站厂房高边坡的渗流场进行二维分析,得出该高边坡的渗流场分布情况,并将其渗流场中几个监测点的水头值与实际监测值进行对比,发现数值大小相差不大,验证了模型的正确性。并计算分析了岩体卸荷与岩体渗流耦合作用下边坡的水平位移和应力分布情况。更多还原

【Abstract】 Firstly, on the basis of present study situation in the field of rock mass seepage at home and abroad, the mechanics characteristics of unloading rock mass and its relation with rock mass seepage, the thesis summarizes the relational characteristics in rock mass seepage. In addition, a new concept of unloading rock mass hydraulic is firstly defined.Secondly, the thesis classifies the rock mass project according to its position and engineering mechanical state. The mechanics characteristics of unloading rock mass is analyzed. It is pointed out that we should adapt different mechanical theory and means owe to its mechanical state. Afer comparing unloading rock mass mechanics with loading rock mass mechanics, their intrinsical distinctions are also pointed out in the thesis. The dissertation has also presented the relationship of hydraulic conduction coefficient and unloading stress and strain through the analysis of the interaction between fractured rock mass seepage and unloading mechanics.Thirdly, the thesis summarizes the determination methods of hydraulic parameters in rock mass, coupled stress and seepage in rock mass and mechanics parameters. In addition, ranked numerical calculation method is introduced in details. Some present rock mass seepage calculation mathematical models in common use are analyzed. And then, mathematical model of coupled stress and seepage fields in rock mass is set up under unloading conditions.In the last, based on the analysis of seepage field in two dimension about high-steep slope of plant at Geheyan hydropower station,distribution of the slope’s seepage field is obtained. Comparing the calculated head value with the monitoring results, we can find the calculated results are consistent with facts, which proves the applicability of the model in this and other similar engineering projects. In addition, under the condition that unloading and seepage is coupled in rock mass, horizontal displacement and stress distribution of the slope is calculated.更多还原