CAJ | 학술논문

利用颗粒流PFC2D建立了岩土体物理模型,在此基础上设计了均以物理模型折减计算初始模型和以前一折减计算结果为下次折减计算初始模型两类计算条件,每一类又设计了只对凝聚力折减、仅对内摩擦角折减、强度参数同时折减3种计算方案,每种计算方案又包含折减1.0、0.50、0.10、0.01、0.0倍等5个计算工况.经对坡面演替、监测点x方向速度变化曲线等计算结果的对比分析发现:凝聚力对于岩土体的直立特性起控制作用,破坏模式多为崩塌倾倒模式;内摩擦角对于稳定坡角具有重要影响;强度参数同时衰减时,强度参数弱化幅度较大情况下岩土体呈散体物质破坏模式,为滑移渐进破坏模式,其中凝聚力弱化0.1倍前后(约10 kPa)后,破坏模式由崩塌破坏转变为滑移破坏.
이용과립류PFC2D건립료암토체물리모형,재차기출상설계료균이물리모형절감계산초시모형화이전일절감계산결과위하차절감계산초시모형량류계산조건,매일류우설계료지대응취력절감、부대내마찰각절감、강도삼수동시절감3충계산방안,매충계산방안우포함절감1.0、0.50、0.10、0.01、0.0배등5개계산공황.경대파면연체、감측점x방향속도변화곡선등계산결과적대비분석발현:응취력대우암토체적직립특성기공제작용,파배모식다위붕탑경도모식;내마찰각대우은정파각구유중요영향;강도삼수동시쇠감시,강도삼수약화폭도교대정황하암토체정산체물질파배모식,위활이점진파배모식,기중응취력약화0.1배전후(약10 kPa)후,파배모식유붕탑파배전변위활이파배.
Physical model of rock and soil mass is built by means of particle flow code software.Based on these,two types of initial calculating condition are designed; one is all discounting from physical model,the other is all beginning with the previous discounting computing result.Each type contains three kinds of discounting method,only discounting cohesion,only discounting internal friction angle and discounting shear strength parameter.Furthermore,each kind embraces five types of discounting rates such as 1.00,0.5,0.1,0.01 and 0.0.Then,evolutional map of slope shape and velocity in x direction of monitoring point are compared and analyzed.It is found that the cohesion does good to uprightness of rock and soil mass,whose failure mode is collapsing and toppling; that the internal friction angle plays an important part in stable slope angle.The failure mode changes from collapsing and toppling mode to slipping step by step mode,when strength parameters is discounting 0.1,cohesion being 10 kPa.