岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2013年
9期
1886-1893
,共8页
岩石力学%深部巷道%扩容碎胀变形%临界条件准则%力学性质劣化%本构模型
巖石力學%深部巷道%擴容碎脹變形%臨界條件準則%力學性質劣化%本構模型
암석역학%심부항도%확용쇄창변형%림계조건준칙%역학성질열화%본구모형
rock mechanics%deep roadway%dilatancy-bulking deformation%critical condition criterion%degradation of mechanical parameters%constitutive model
高应力卸荷条件下岩石扩容碎胀非连续变形行为研究对揭示深部巷道围岩稳定性演化及控制机制，分析预测围岩稳定性具有至关重要的意义。为此，依托室内岩石三轴卸荷试验，首先研究全应力-应变曲线各特征应力值随围压变化的演化特征，提出岩石进入峰前损伤扩容与峰后破裂碎胀阶段的临界条件准则，并考虑扩容碎胀破裂演化过程中岩样力学性质劣化规律，建立描述卸荷条件下岩石损伤扩容和破裂碎胀演化机制的本构模型，采用VC++编程语言将该模型嵌入到 UDEC 软件中，实现其非线性数值计算功能。同时，通过室内岩石试验曲线的模拟拟合，表明该模型在描述岩石扩容碎胀特性方面的合理性。最后，将该模型应用于一典型深部巷道围岩破损区分布的模拟研究中，通过与经典模型的对比分析，验证该模型在工程应用方面的可行性，并有针对性地提出深部巷道稳定性分析与维护的合理化建议。
高應力卸荷條件下巖石擴容碎脹非連續變形行為研究對揭示深部巷道圍巖穩定性縯化及控製機製，分析預測圍巖穩定性具有至關重要的意義。為此，依託室內巖石三軸卸荷試驗，首先研究全應力-應變麯線各特徵應力值隨圍壓變化的縯化特徵，提齣巖石進入峰前損傷擴容與峰後破裂碎脹階段的臨界條件準則，併攷慮擴容碎脹破裂縯化過程中巖樣力學性質劣化規律，建立描述卸荷條件下巖石損傷擴容和破裂碎脹縯化機製的本構模型，採用VC++編程語言將該模型嵌入到 UDEC 軟件中，實現其非線性數值計算功能。同時，通過室內巖石試驗麯線的模擬擬閤，錶明該模型在描述巖石擴容碎脹特性方麵的閤理性。最後，將該模型應用于一典型深部巷道圍巖破損區分佈的模擬研究中，通過與經典模型的對比分析，驗證該模型在工程應用方麵的可行性，併有針對性地提齣深部巷道穩定性分析與維護的閤理化建議。
고응력사하조건하암석확용쇄창비련속변형행위연구대게시심부항도위암은정성연화급공제궤제，분석예측위암은정성구유지관중요적의의。위차，의탁실내암석삼축사하시험，수선연구전응력-응변곡선각특정응력치수위압변화적연화특정，제출암석진입봉전손상확용여봉후파렬쇄창계단적림계조건준칙，병고필확용쇄창파렬연화과정중암양역학성질열화규률，건립묘술사하조건하암석손상확용화파렬쇄창연화궤제적본구모형，채용VC++편정어언장해모형감입도 UDEC 연건중，실현기비선성수치계산공능。동시，통과실내암석시험곡선적모의의합，표명해모형재묘술암석확용쇄창특성방면적합이성。최후，장해모형응용우일전형심부항도위암파손구분포적모의연구중，통과여경전모형적대비분석，험증해모형재공정응용방면적가행성，병유침대성지제출심부항도은정성분석여유호적합이화건의。
The rock dilatancy-bulking deformation characteristics under high geostress unloading condition are critically important to understand the stability evolution and control mechanism of deep roadways,and to evaluate the stability of surrounding rocks. Using the triaxial unloading tests on the rocks sampled from the Gubei colliery, the evolution characteristics of the typical stresses with confining pressure are first studied. The criterion of rocks approaching pre-peak damage dilatancy and post-peak bulking deformation under critical condition is proposed. Then,the damage and degradation process of mechanical parameters of rocks during unloading are considered, and a progressive failure constitutive model is subsequently constructed. Finally,the distinct element code UDEC is embedded into the model to realize nonlinear numerical calculation. Simulation results of triaxial unloading tests show that the proposed model is suitable for describing the rock dilatancy-bulking deformation characteristics. Besides,the proposed model is used to evaluate the excavation damaged zone(EDZ) around a deep roadway. Compared with classical Mohr-Coulomb strain softening model,the performances of the proposed model are suggested to be applicable for practical engineering,and helpful for stability analysis and maintenances of deep roadways.
