论文部分内容阅读
为研究隧道突水、突泥过程中断层及围岩各物理场变化规律,根据地质力学模型试验相似原理,通过大量多组别配比试验,研制出适用于流-固耦合模型试验的新型断层及围岩相似材料。其中,断层相似材料以砂为粗骨料,滑石粉为细骨料,石膏、膨润土作为胶结剂,液态石蜡作为调节剂;围岩相似材料以砂为粗骨料,重晶石粉、滑石粉为细骨料,白水泥及乳胶作为胶结剂。通过大量室内试验,对比分析原岩及相似材料变形特征及强度破坏特性,重点对单轴抗压强度、渗透系数、重度、泊松比、弹性模量等重要变形及水理特性参量进行调控,系统研究不同配比对材料参数的影响规律。试验结果表明:该材料力学参数变化范围广、性能稳定、操作工艺简单,可用来模拟不同渗透系数的低、中等强度岩体材料。将该相似材料应用于吉莲高速公路永莲隧道断层突水、突泥三维地质力学模型试验中,力学性能及水理特性均达到试验要求,能够有效地模拟突水、突泥的发展演变过程,真实反映断层灾变过程中各物理场响应规律。
In order to study the variation law of each physical field in the process of water inrush and mud outburst in tunnel, according to the similarity principle of geomechanical model test, a new type of fault suitable for fluid-solid coupling model test Similar materials and surrounding rock. Among them, similar materials for the fault are sand as coarse aggregate, talc as fine aggregate, gypsum and bentonite as cementing agent and liquid paraffin as modifier. Similar materials for surrounding rock are sand as coarse aggregate, barite powder and talcum powder as Fine aggregate, white cement and latex as a binder. Through a large number of laboratory tests, the deformation characteristics and strength failure characteristics of the original rock and similar materials were contrasted and analyzed. The key deformation and hydraulic parameters such as uniaxial compressive strength, permeability coefficient, heavy degree, Poisson’s ratio and elastic modulus were emphasized. Systematic study of the impact of different ratio of material parameters of the law. The experimental results show that the material has a wide range of mechanical parameters, stable performance and simple operation. It can be used to simulate low and medium-strength rock materials with different permeability coefficients. Applying the similar material to the three-dimensional geomechanical model test of water inrush and mud in the Yonglian tunnel of Jilian Expressway, the mechanical properties and hydraulic properties meet the test requirements, which can effectively simulate the development and evolution of water inrush and mud. It truly reflects the response law of each physical field in the process of fault catastrophe.