不同条件下非饱和土中孔隙气压变化特征研究  

Variation characteristics of pore pressure in unsaturated soils under different conditions

作　　者：王帆[1] 徐啸川 WANG Fan;XU Xiaochuan(Guilin Institute of Mineral Geology Engineering Co.,Ltd.,Guilin Guangxi 541004,China;School of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]桂林矿产地质研究院工程有限公司,广西桂林541004 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《有色金属（矿山部分）》2023年第5期98-106,共9页NONFERROUS METALS(Mining Section）

基　　金：湖北省重点研发计划项目(2021BCA219)。

摘　　要：在研究土体内水的渗透行为时,通常直接采用压力表测量孔隙水压力。实际上压力表的测量值中包含了孔隙水压和孔隙气压。通常假设土体内的孔隙气压为0 kPa,所以一般没有考虑孔隙气压的影响。然而,根据近年来的研究认为,土体内孔隙气压的上升可能会对降雨时的边坡破坏、雨水渗透等产生影响。因此,在本研究中,为了掌握不同条件(降雨条件、地下水条件、排气条件)下的孔隙气压情况,进行了雨水渗透情况下土体内孔隙气压的测量试验。结果表明,由于地表处于内涝状态,土体内的孔隙气压会上升,说明了降雨时测量孔隙气压是极为必要的。研究结果为弃土边坡的长期运行与监测预警提供一定的理论依据。Pressure gauge is usually used directly to measure pore water pressure when studying the seepage behavior of water in the soil.The gauge actually measures both pore water pressure and pore pressure.It is usually assumed that the pore pressure in the soil body is 0 kPa,so the effect of pore pressure is not considered in general.However,according to recent studies,it is believed that the rise of pore pressure in the soil body may have an impact on slope destruction and rainwater infiltration during rainfall.Therefore,in this study,in order to master the pore pressure under different conditions(rainfall,groundwater,and exhaust),the pore pressure measurement test in the soil body under the condition of rainwater infiltration was carried out.The results show that the pore pressure in the soil will rise due to the waterlogging state,which indicates that it is very necessary to measure pore pressure during rainfall.The research results provide a theoretical basis for the long-term operation,monitoring,and warning of the abandoned soil slope.

关 键 词：土体 降雨 孔隙气压 孔隙水压 压力表 

分 类 号：TD854.6[矿业工程—金属矿开采]