杨洁
YANG Jie

• 1:湖北轻工职业技术学院建筑工程与设计学院

摘要(Abstract)：

边坡岩体含水裂隙在爆破开挖扰动下的扩展贯通是引发边坡滑坡的主要因素之一，也是岩土工程界的研究热点。从断裂力学角度出发分析了爆破荷载对边坡岩体含水共线双裂隙的扩展扰动机制。结果表明：爆破荷载作用下边坡岩体含水共线双裂隙的扩展与爆破应力波的幅值、裂隙水压、静态地应力大小、裂隙间距、裂隙长度和裂隙角等因素有关，边坡岩体裂隙系统之间的扩展与贯通由这些因素共同决定；给出了广义临界扰动荷载Q和混合应力强度因子K~A_Ⅱ(D)的表达式。爆炸应力波的作用实际上是增大了裂隙中的裂隙水压力。爆破开挖作用导致岩体侧压力系数m变化，会引起裂隙水压的改变，对裂隙的扩展的影响较为复杂；裂隙内端的II型混合应力强度因子K~A_Ⅱ(D)和广义临界扰动荷载的Q随爆破载荷幅值的增加而增加。K~A_Ⅱ(D)随着裂纹倾角的增加先增加后减小，在45°裂隙最容易出现起裂扩展。K~A_Ⅱ(D)随着裂隙长度的增加而增加，K~A_Ⅱ(D)随裂隙间距的增大而减小，裂隙间距对K~A_Ⅱ(D)有抑制作用。
The expansion and penetration of water bearing cracks in slope rock mass under the disturbance of blasting excavation is one of the main factors causing slope landslide, and it is also a research hotspot in geotechnical engineering. In this paper, the propagation and disturbance mechanism of blasting load on water collinear double cracks in slope rock mass is analyzed from the perspective of fracture mechanics. The results show that the expansion of water bearing collinear double fractures in slope rock mass under blasting load is related to the amplitude of blasting stress wave, fracture water pressure, static in-situ stress, fracture spacing, fracture length and fracture angle, and the expansion and penetration between fracture systems of slope rock mass are determined by these factors; The expressions of generalized critical disturbance load Q and mixed stress intensity factor are given. The effect of explosion stress wave is actually to increase the fracture water pressure in the fracture. Blasting excavation leads to the change of rock lateral pressure coefficient m, which will cause the change of fracture water pressure, and the influence on fracture propagation is complex; The type II mixed stress intensity factor of K~A_Ⅱ(D) at the inner end of the crack and the Q of the generalized critical disturbance load increase with the increase of the amplitude of the blasting load. With the increase of crack dip angle, K~A_Ⅱ(D) first increases and then decreases. Crack initiation and propagation are most likely to occur in 45° cracks. K~A_Ⅱ(D) increases with the increase of fracture length and decreases with the increase of fracture spacing, and the fracture spacing has an inhibitory effect on K~A_Ⅱ(D).

关键词(KeyWords)： 爆破荷载;含水共线裂隙;扩展;断裂模型
blasting load;water bearing collinear fissure;expansion;fracture model

Abstract:

Keywords:

基金项目(Foundation): 湖北省教育厅基金资助项目(B2018477)

作者(Author): 杨洁
YANG Jie

DOI: 10.19931/j.eb.20220028

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