基于复合材料力学的锚固巷道数值模拟研究

为了建立一种符合锚喷支护围岩稳定性分析和支护参数总体评价的简化等效计算方法,应用复合材料力学的基本原理,建立了加锚岩体的复合材料力学模型。首先将锚杆和砂浆视为弹性体,推导了锚杆-砂浆复合体等效力学模型的弹性参数;然后将岩体和锚杆-砂浆复合体视为复合增强材料,建立了横观各向同性体模型,并推导了该等效力学模型相应参数的确定公式。在此基础上依据工程实例,分别进行了复合后巷道模型与常规离散巷道模型的数值模拟研究;通过对巷道两帮、顶、底部位移和围岩应力的对比分析,验证了该等效方法的可行性和适用性。

Numerical Simulation of Bolted Roadway Based on Composite Material Mechanics

To establish a simplified equivalent method accorded with the stability analysis of sur-rounding rock and support parameters evaluation in the bolt-shotcrete support,a mechanics model of composite materials for anchored rock mass is established in this paper,according to the basic principle of composite material mechanics.First,regarding the anchor and mortar as elastic body,the elastic pa-rameters of equivalent anchor-mortar mechanical model are deduced.Then,regarding the rock and an-chor-mortar complex as composite reinforced materials,the transverse isotropic body model is estab-lished,and the defined formula of corresponding parameters from the equivalent mechanical model are deduced.Moreover,based on the engineering example,numerical simulations are conducted to study the composite roadway model and conventional discrete roadway model.After the comparative analysis about the displacements in two sides,top and bottom of roadway and surrounding rock stress,the feasi-bility and applicability of the equivalent method is verified.