湖北地区不同岩性崩塌破坏过程及防护措施分析

Analysis of the Damage Process and Protective Measures of Different Lithologic Collapse in Hubei Province

【目的】探究不同地层岩性崩塌体的破坏特征,并提供出相应的防护措施。【方法】以鄂州鄂城区白雉山林场崩塌与鄂西兴山县下公堡崩塌为典型代表,结合现场实地调查一手资料对不同运动路线的崩塌落石滚动过程进行分析。【结果】不同岩性落石破坏过程和坡脚的微地貌存在直接相关关系,寒武系覃家庙组白云岩落石滚动路线为三条近似平行直线,运动过程可以划分为裂隙扩张阶段、消能阶段、破坏解小阶段;粉质黏土夹碎石及中~微风化的闪长岩滚落的路线是发射状,运动过程可以划分为岩块风化阶段、崩落阶段、破坏解小阶段。【结论】崩塌体所处斜坡坡面地质特征存在差异性,崩塌体能量消耗过程、运动过程均不相同,因此防治措施也应因地制宜。

[Purposes]This paper aims to explore the failure characteristics of rock avalanches in different strata and provide corresponding protective measures.[Methods]Taking the collapse of Baizhishan Forest Farm in Echeng District of eastern Hubei Province and the collapse of Xiagongpu in Xingshan County of western Hubei Province as typical representatives,combined with the first-hand data of field investigation,the rolling process of collapse rockfall with different motion routes was analyzed.[Findings]There is a direct correlation between the failure process of different lithology rockfalls and the microtopography of the slope foot.The rolling route of dolomite rockfalls in the Cambrian Qinjiamiao Formation is three approximately parallel lines.The movement process can be divided into fracture expansion stage,energy dissipation stage and failure solution stage.The rolling route of silty clay with gravel and medium to slightly weathered diorite is emission,and the movement process can be divided into rock weathering stage,caving stage and destruction stage.[Conclusions]There are differences in the geological characteristics of the slope where the collapse body is located.The energy consumption process and movement process of the collapse body are different.Therefore,the prevention and control measures should also be adapted to local conditions.