堆积斜坡降雨条件下失稳机理分析——以擦耳岩滑坡为例
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摘要
降雨条件下堆积斜坡的失稳过程和失稳机理是一个复杂的过程。借助PFC2D软件以擦耳岩滑坡为例,研究了降雨条件下堆积斜坡的位移响应特征和速度响应特征。结果表明:此类斜坡在降雨条件下滑动方式表现为前牵后推式。失稳模式为:雨水入渗,内部土体饱和,滑体剪应力增大,雨水继续入渗,汇集于坡体前缘,前缘率先发生较大变形破坏,后部坡体前移,不断堆积,造成斜坡整体加速滑移,由于坡体内土体及碎块石相互碰撞加上水流阻力动能消散,滑体最终停滞。失稳机理为:降雨累积—前后缘率先破坏—整体呈近松散状下滑—受阻消能停滞滑落—堆积。可为汶川震区在降雨条件下堆积斜坡失稳机理研究提供参考。
The instability process and instability mechanism of the accumulation slope under rainfall conditions is a complex process. Taking the PFC2 D software as an example, the displacement response characteristics and velocity response characteristics of the accumulation slope under rainfall conditions are studied. The results show that the sliding mode of such slopes under the condition of rainfall shows the front-traction and back-pull type. The instability mode is: rainwater infiltration, internal soil saturation, sliding body shear stress increase, rainwater continues to infiltrate, pooling on the front edge of the slope, the leading edge first undergoes large deformation and damage, and the rear slope moves forward, accumulation causing the slope to sliding acceleration as a whole, the sliding body eventually stagnates due to the collision of soil and debris in the slope and the kinetic energy of the water flow. The mechanism of instability is: rainfall accumulation-the front and the back are the first to be destroyed-the whole is nearly loosely falling-blocking energy dissipation stagnates and accumulates. This study can provide a reference for the study of the instability mechanism of the accumulation slope under the rainfall conditions in Wenchuan earthquake area.
The instability process and instability mechanism of the accumulation slope under rainfall conditions is a complex process. Taking the PFC2 D software as an example, the displacement response characteristics and velocity response characteristics of the accumulation slope under rainfall conditions are studied. The results show that the sliding mode of such slopes under the condition of rainfall shows the front-traction and back-pull type. The instability mode is: rainwater infiltration, internal soil saturation, sliding body shear stress increase, rainwater continues to infiltrate, pooling on the front edge of the slope, the leading edge first undergoes large deformation and damage, and the rear slope moves forward, accumulation causing the slope to sliding acceleration as a whole, the sliding body eventually stagnates due to the collision of soil and debris in the slope and the kinetic energy of the water flow. The mechanism of instability is: rainfall accumulation-the front and the back are the first to be destroyed-the whole is nearly loosely falling-blocking energy dissipation stagnates and accumulates. This study can provide a reference for the study of the instability mechanism of the accumulation slope under the rainfall conditions in Wenchuan earthquake area.
引文
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[13]田松何,郑红超,璩泽君.降雨和地震作用下黏土边坡的稳定性分析[J].人民珠江,2017,38(3):8-12.
[2] 左自波,张璐璐,王建华.降雨触发不同级配斜坡滑坡模型试验研究[J].岩土工程学报,2015,37(7):1319-1327.
[3] 杨宗佑,蔡焕,雷小芹,等.非饱和地震堆积斜坡降雨破坏水-力耦合行为的试验研究[J].岩土力学,2018,40(1):33-43.
[4] 赵永辉,涂国祥,董劲,等.基于FLAC3D的澜沧江古水水电站争岗堆积斜坡稳定性分析[J].路基工程,2016(1):182-185.
[5] 石崇,张玉,孙怀昆,等.争岗堆积斜坡滑面强度参数反演分析[J].岩石力学与工程学报,2010,29(S2):3728-3734.
[6] 张玉,徐卫亚,石崇,等.争岗堆积斜坡稳定性及治理措施研究[J].岩土工程学报,2010,28(9):1470-1478.
[7] 魏宝龙,徐卫亚,王如宾.降雨条件下某堆积斜坡稳定性研究[J].三峡大学学报(自然科学版),2015,37(2):20-25.
[8] 甘凤玲,何丙辉,王涛.汶川震区堆积斜坡降雨入渗产流特征人工模拟实验研究[J].水利学报,2016,47(6):780-788.
[9] 甘凤玲,何丙辉,王涛.汶川震区堆积斜坡坡面人工降雨入渗模拟研究[J].水土保持学报,2015,29(6):19-24.
[10]孙陶,陈英.有限单元法在边坡稳定分析中的应用实例——天龙湖电站较场堆积斜坡稳定性评价[J].四川水力发电,2001,20(1):28-31.
[11]刘兴宁,石崇,李德杰,等.争岗堆积斜坡滑坡灾害数值模拟预测分析[J].科学技术与工程,2015,15(1):1-7.
[12]谢黎黎.降雨条件下平武县某土质滑坡的渗流及稳定性分析[J].人民珠江,2018,39(11):50-56.
[13]田松何,郑红超,璩泽君.降雨和地震作用下黏土边坡的稳定性分析[J].人民珠江,2017,38(3):8-12.
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