摘要
分析了土洞的形成机理及影响土洞发育的因素,认为超静孔隙水压力或真空吸力使土的结构体(块体)产生剥落,而动水压力则使土的细颗粒产生迁移,两者共同作用,使土洞不断扩大。并推导出土洞形成的起始条件:临界水位降幅、临界地下水流速以及临界抽水涌水量的表达式。
The formation mechanism and factors affecting of soil cavity are analyzed. It is realized that super- hydrostatic pressure makes the soil block spalled and fissured,and hydrodynamic pressure makes soil fine grain migrated. Both actions induce the enlargement of soil cavity. The initial conditions of soil cavity formation,i. e.,the critical declined magnitude of water level crHD,critical water flowrate vcr and critical discharge Qcr are formulated.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第8期1377-1382,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
土洞
孔隙水压力
临界地下水
流速
涌水量
soil mechanics,soil cavity,initial condition,declined amplitude of critical water level,critical water flowrate,critical discharge
