多次爆破能量下滑块位移法分析滑坡稳定性  

Landslide Stability Analyzed by Slider Displacement Method with Many Times of Blasting Energy

作　　者：唐红梅[1] 周云涛[1] 

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2014年第4期90-94,100,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(11272185);重庆市国土科技项目(cqgt120301)

摘　　要：爆破荷载对滑坡体的作用过程实际是爆破引起滑体滑面位移累加的过程;将滑坡滑移面简化为拉裂段、剪切段和蠕滑段,建立了滑坡振动的物理模型和滑块的力学模型,基于剪切段和蠕滑段的本构方程得出滑坡滑动过程的应变能公式,同时分析得出了爆破地震波衰减能量、重力势能以及滑坡体阻尼耗能公式,通过能量守恒最终计算出剪切段和蠕滑段的位移量,并给出单次和多次爆破振动下滑坡的总位移量表达式。以码头隧道洞口滑坡为例,获得每个条块的单位滑移量,并判定滑移破坏首先是剪切和蠕滑交接处,其次为剪切段顶端,最终是蠕滑段末端,同时得到单次振动滑坡滑移量为83.92 mm,假定一次爆破影响相同,监测滑坡临界破坏总位移量为670 mm,只需7.98次爆破滑坡即发生滑移破坏。Blasting load＇ s influence on the landslide was generally caused by blasting process of accumulative sliding surface displacement of the landslide mass. The sliding surface was simplified into ripping, shear and creep sliding section, and the physical model of slide vibration and the mechanics model of the slider were established. Based on shear and creep constitu- tive equation, the slip strain energy formula of the sliding process was obtained, and at the same time, the blasting seismic wave attenuation energy, gravitational potential energy and the energy dissipation expression of landslide damping were also obtained by analysis. Through the energy conservation principle the displacement at shear and creep sections was finally cal- culated. And the total displacement expression under a single and multiple blasting vibrations was obtained. Taking Matou tunnel portal landslide as an example, the displacement for each unit of slippage was obtained, which provided a judgment that the shear and creep sliding failure was the junction first, followed by the top of shear section, and ultimately the end of creep section. And at the same time, a single vibration landslide slippage obtained was 83.92 mm. If the blasting effect was the same at every time, the total critical displacement of the landslide sliding destruction is 670 mm, and the landslide sliding destruction was caused only by 7.98 times of landslide blasting.

关 键 词：环境工程 动力地质学 能量 位移 滑块位移法 滑坡 

分 类 号：U416.163[交通运输工程—道路与铁道工程] P512.5[天文地球—地质学]