摘要:
以四川巴中通江县寨槽平推滑坡式崩塌为案例,通过分析平推滑坡式危岩崩塌的形成条件、诱因机制,得出防治措施。形态上,基岩陡壁上方发育一组平行坡面走向、宽度为1 m、两侧封闭的张拉裂缝。强降雨时,地表水的汇集流入裂缝,除了本身具有静水压力和动水压力以外,还有瞬时高水头在裂缝中的劈楔作用,促进了裂缝的发展。坡体上部的砂岩层也会沿着软弱夹层向外推挤,当挤移产生临空面时,就会导致崩塌发生,该模式是先平推推移、崩塌、再推移、再崩塌的模式。为了彻底消除该类型崩塌体的灾害隐患,在治理崩塌的前提下,还必须考虑减轻水对该坡体的影响,并应考虑防止裂缝的工程措施。
Abstract:
Take the example of plane-shoving slide collapse in Tongjiang, by the analysis on the formation conditions and incentive mechanism, the control measures are obtained.For the shape, a group of paralleled tension cracks develop above the steep rock with width of 1m, both sides is enclosed.In heavy rainfall, the surface water flow into the cracks, in addi-tion to the hydrostatic pressure and hydrodynamic pressure, the splitter action of instantaneous high head in cracks promotes the development of cracks.At the same time, the sand stone layer of the upper part will push outward along the weak inter-layer; while the free surface is produced by extruding shift, collapsing will occur.This model is plane-shoving shift, collap-sing, shift again and collapsing again.In order to eliminate the hidden troubles of this type of landslide disasters, in the premise of collapse control, reducing effects of water on the slope must also be considered, as well as the engineering meas-ures to prevent cracks.
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