【摘要】 以深圳大龙山边坡为例,采用水分计、张力计、渗压计、固定式测斜仪和雨量计等针对边坡开展了降雨量、不同部位边坡土体基质吸力、体积含水量、孔隙水压力和深部水平变形等的监测,对降雨条件下边坡水文过程和内部变形进行了分析,发现当日降雨量较小时,如在2009年4月18日日降雨量为52.4mm/d的情况下,地表以下0.5m和1m深度土体含水量和基质吸力都发生响应;日降雨量较大时,如在2009年5月23日、24日连续两天日降雨量超过100mm/d的降雨情况下,3m深度内的体积含水量和基质吸力均表现响应;渗压计P4的地下水位距离地表只有约6m的距离,监测到瞬态孔隙水压力对降雨响应及其敏感,其余渗压计的孔隙水压力基本未发生变化,推测持时短的暴雨易造成山体边坡的浅层滑坡。同时,该边坡在3m内的累积位移相对较大,最大累积如测斜IN3A向累积位移接近10mm。但累积位移无继续增大的趋势,处于稳定状态。更多还原

【Abstract】 Monitoring of hydrological response and associated displacement of a slope under rainfall conditions is an important aspect of early warning of a landslide.In this paper,the Dalongshan slope in Shenzhen was used as a study site.Geotechnical instruments,including moisture probes,tensiometers,piezometers,in-place inclinometers and raingauge,were installed to measure matric suction,volumetric water content,pore water pressure,slope displacement,and rainfall.Based on monitoring data,the hydrological processes and slope deformation of the slope under rainfall conditions were analyzed.The results show that when daily rainfall was relatively small,for example,on 18 April 2009 in the case of daily rainfall of 52.4 mm/day,0.5 m below the surface and 1 m depth of soil water content and matric suction responsed to rainfall respectively,whereas daily rainfall was relatively large,for example,on 23-24 May 2009,in two consecutive days daily rainfall exceed 100 mm/day,matric suction and volumetric water content within 3 m responsed rapidly to rainfall infiltration,and groundwater level measured at P4 was very sensitive to rainfall.However,the pore water pressures measured at other piezometers did not vary significantly with rainfall.It was thus inferred that short-duration rainstorm can probably result in shallow failure.Meanwhile,cumulative displacement is relatively large within a depth of 3 m of the slope,and maximum total cumulative displacement measured at IN3 was close to 10 mm.However,the cumulative displacement remained a steady state rather than an increasing state.更多还原