CAJ | 학술논문

岩体内部微裂纹的存在及其扩展，会导致岩体产生刚度和强度劣化，使巷道围岩松动范围扩大。通过定义刚度劣化系数和强度劣化系数，考虑弱胶结软岩峰后应变软化和塑性扩容特性，采用损伤理论和三直线应变软化模型，建立了弱胶结软岩巷道围岩弹塑性流动损伤模型，推导了非均匀应力场下围岩分别产生弹性损伤区、塑性软化损伤区和塑性流动损伤区时的应力、位移解析解；探讨了鲁新煤矿弱胶结砂质泥岩巷道的原岩应力水平、刚度劣化、扩容梯度等对围岩的损伤演化及位移场、塑性圈的影响规律。结果表明，剪胀效应对围岩塑性圈的大小及应力响应影响不大，但对塑性区的损伤速度及位移影响很大；原岩应力水平对巷道塑性圈的分布具有显著影响；刚度和强度劣化系数的增大会加快围岩的劣化速度。这些因素在围岩稳定性分析及巷道支护设计中均应引起足够重视。
암체내부미렬문적존재급기확전，회도치암체산생강도화강도열화，사항도위암송동범위확대。통과정의강도열화계수화강도열화계수，고필약효결연암봉후응변연화화소성확용특성，채용손상이론화삼직선응변연화모형，건립료약효결연암항도위암탄소성류동손상모형，추도료비균균응력장하위암분별산생탄성손상구、소성연화손상구화소성류동손상구시적응력、위이해석해；탐토료로신매광약효결사질니암항도적원암응력수평、강도열화、확용제도등대위암적손상연화급위이장、소성권적영향규률。결과표명，전창효응대위암소성권적대소급응력향응영향불대，단대소성구적손상속도급위이영향흔대；원암응력수평대항도소성권적분포구유현저영향；강도화강도열화계수적증대회가쾌위암적열화속도。저사인소재위암은정성분석급항도지호설계중균응인기족구중시。
The cracking of stiffness and strength, due to existing and development of micro cracks in elastic region, causes the loosening scope of roadway surrounding rock expanded. By defining stiffness cracking coefficient and strength cracking factor, considering characteristics of strain softening and plastic dilatancy after post-peak, the article established an elastic-plastic flow damage model for weakly consolidated soft rock under non-uniform initial stress field on the basis of damage theory and strain softening model with three linear steps; inferred analytical solutions of stresses, displacements when surrounding rock generate three different failure areas:elastic zone, elastic and plastic softening zone, and plastic flow zone;and discussed the rule on the influence of original rock stress, strength cracking, dilatancy gradient of soft surrounding rock in Luxin coal mine on damage evolution, displacement and plastic circle of surrounding rock. Results show that dilatancy gradient has great effect on damage speed and displacements in plastic zone while it has little effect on the size of plastic circle and stress res-ponses; that original rock stress level has remarkable influence on the distribution of plastic circle of the roadway; and that the rising of stiffness and strengthen cracking coefficient will accelerate the cracking speed of surrounding rock, which should be paid enough attention in analyzing the stability of the surrounding rock and designing weakly consolidated soft rock tunnel.