简介概要

层状反倾岩质边坡崩塌机理研究: 以湖北鹤峰红莲池铁矿边坡为例

来源期刊:中南大学学报(自然科学版)2014年第7期

论文作者:王章琼 晏鄂川 尹晓萌 张颀明 唐睿璇

文章页码:2295 - 2303

关键词:反倾岩坡;崩塌;弯曲倾倒;离散元数值模拟;破坏机理

Key words:anti inclined rock slope; collapse; bending and toppling; discrete element numerical simulation; failure mechanism

摘    要:以湖北鹤峰红莲池铁矿山体崩塌为例,在分析边坡地质条件及采矿扰动的基础上,通过离散元软件UDEC模拟,研究边坡在自重、露采、地下开采等因素作用下的变形破坏特征,认为这一类层状反倾岩质边坡发生崩塌灾害的控制性因素主要有4个:(1) 层状块裂岩体结构,岩体被岩层面及节理切割成块体,离散性好,形成架空结构;(2) 露天开采导致弯曲倾倒变形,露采区上部岩体发生类似于“悬臂梁”的弯曲变形,边坡处于长期蠕变状态;(3) 地下开采直接降低下部岩体的竖向承载力,同时,部分“悬臂梁”嵌固端被截断,导致其抗弯力矩降低,边坡岩体加速蠕变;(4) 暴雨加速崩塌发生,降雨入渗直接导致岩体结构面强度降低,并在节理裂隙中产生渗透压力或静水压力,加速崩塌的发生。对于该类层状反倾山体,矿体主要埋藏于地下,山脚也有出露,前期露天开采和后期地下开采共同导致山体应力环境的调整,是崩塌发生的主要原因。建议采取对露天采空区上部岩体进行支撑、对地下采空区进行及时回填、对山体上部裂隙进行封填的防治措施。

Abstract: Taking Honglianchi Iron Mine collapse in Hefeng, Hubei for example, based on analyzing geological conditions and mining exploitation, the deformation and failure pattern of the slope with gravity, open-pit mining and underground mining were simulated with the universal distinct element code (UDEC). The results show that the collapse of anti inclined rock slope has 4 principal characters. (1) Bedding block-broken body structure, rock mass is split into distinct blocks with levels and several groups of joints, and form overhead structure. (2) Open pit mining causes bending and toppling deformation, and in upper rock mass of pit mining region there occurs bending deformation similar to cantilever beam, and the slope is at long-term creep state. (3) Underground mining forming goaf decreases the vertical bearing capacity of the lower part of mountain, meanwhile, it cuts off part of the fixed end of cantilever beam, and decreases the bending torque of the cantilever beam, accelerates the creep of slope rock mass. (4) Rainstorm accelerates the collapse, rainwater decreases the strength of structural plane in rock mass directly, and causes osmotic pressure or hydrostatic pressure in joint fissure, which accelerates the collapse. For this kind of layered-anti inclined rock mass slope, ore deposite is mainly buried under the ground, and also out cropped in the foot of the mountain, and the joint action of open pit mining at prophase and underground mining at anaphase causes stress field to change, which is the main reason for the collapse. It is suggested that support the upper rock mass of open pit goaf, timely backfill the underground goaf, seal and fill the upper part of the slope so as to prevent and control the collapse.



详情信息展示

层状反倾岩质边坡崩塌机理研究: 以湖北鹤峰红莲池铁矿边坡为例

王章琼,晏鄂川,尹晓萌,张颀明,唐睿璇

(中国地质大学(武汉) 工程学院,湖北 武汉,430074)

摘 要:以湖北鹤峰红莲池铁矿山体崩塌为例,在分析边坡地质条件及采矿扰动的基础上,通过离散元软件UDEC模拟,研究边坡在自重、露采、地下开采等因素作用下的变形破坏特征,认为这一类层状反倾岩质边坡发生崩塌灾害的控制性因素主要有4个:(1) 层状块裂岩体结构,岩体被岩层面及节理切割成块体,离散性好,形成架空结构;(2) 露天开采导致弯曲倾倒变形,露采区上部岩体发生类似于“悬臂梁”的弯曲变形,边坡处于长期蠕变状态;(3) 地下开采直接降低下部岩体的竖向承载力,同时,部分“悬臂梁”嵌固端被截断,导致其抗弯力矩降低,边坡岩体加速蠕变;(4) 暴雨加速崩塌发生,降雨入渗直接导致岩体结构面强度降低,并在节理裂隙中产生渗透压力或静水压力,加速崩塌的发生。对于该类层状反倾山体,矿体主要埋藏于地下,山脚也有出露,前期露天开采和后期地下开采共同导致山体应力环境的调整,是崩塌发生的主要原因。建议采取对露天采空区上部岩体进行支撑、对地下采空区进行及时回填、对山体上部裂隙进行封填的防治措施。

关键词:反倾岩坡;崩塌;弯曲倾倒;离散元数值模拟;破坏机理

Study on collapse mechanism of anti inclined rock slope: A case study of Honglianchi Iron Mine slope in Hefeng, Hubei province

WANG Zhangqiong, YAN Echuan, YIN Xiaomeng, ZHANG Qiming, TANG Ruixuan

(Faculty of Engineering, China University of Geosciences, Wuhan 430074, China)

Abstract:Taking Honglianchi Iron Mine collapse in Hefeng, Hubei for example, based on analyzing geological conditions and mining exploitation, the deformation and failure pattern of the slope with gravity, open-pit mining and underground mining were simulated with the universal distinct element code (UDEC). The results show that the collapse of anti inclined rock slope has 4 principal characters. (1) Bedding block-broken body structure, rock mass is split into distinct blocks with levels and several groups of joints, and form overhead structure. (2) Open pit mining causes bending and toppling deformation, and in upper rock mass of pit mining region there occurs bending deformation similar to cantilever beam, and the slope is at long-term creep state. (3) Underground mining forming goaf decreases the vertical bearing capacity of the lower part of mountain, meanwhile, it cuts off part of the fixed end of cantilever beam, and decreases the bending torque of the cantilever beam, accelerates the creep of slope rock mass. (4) Rainstorm accelerates the collapse, rainwater decreases the strength of structural plane in rock mass directly, and causes osmotic pressure or hydrostatic pressure in joint fissure, which accelerates the collapse. For this kind of layered-anti inclined rock mass slope, ore deposite is mainly buried under the ground, and also out cropped in the foot of the mountain, and the joint action of open pit mining at prophase and underground mining at anaphase causes stress field to change, which is the main reason for the collapse. It is suggested that support the upper rock mass of open pit goaf, timely backfill the underground goaf, seal and fill the upper part of the slope so as to prevent and control the collapse.

Key words:anti inclined rock slope; collapse; bending and toppling; discrete element numerical simulation; failure mechanism

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