THEORETICAL ANALYSIS OF PARTIALLY PENETRATED SAND DRAINS FOUNDATION IN CONSIDERATION OF SMEAR EFFECT
GUO Biao1，GONG Xiaonan1，LU Mengmeng2，LI Ying1
(1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China； 2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China)
Abstract：Under equal strain assumption and instantaneous loading condition，the consolidation of soft soil with partially penetrated vertical drains under single-drainage condition and double-drainage condition is studied. Vertical and radial seepages of soils under sand drains are considered through setting suppositional sand drains. Meanwhile，in order to consider the fact that the larger the distance from sand drain is，the lighter the disturbance of construction is，the horizontal permeability of soils is expressed in unified way through introducing a function. Three types of variation patterns of the horizontal permeability of soil in the disturbed soil zone are considered，including the constant distribution pattern，the linear distribution pattern and the parabolic distribution pattern，and an analytical solution is obtained. Corresponding computer program is developed and several problems that should pay attention to during the process of programming are expounded；then the consolidation behavior of partially penetrated sand drains foundation is investigated. The results show that the consolidation is the fastest if the parabolic distribution pattern is considered；the consolidation is slower if the linear distribution pattern is considered；the consolidation is slowest if the constant distribution is considered；and that the larger the disturbance zone is；the slower the consolidation is；the greater the disturbance is，the slower the consolidation is；the deeper the sand drains is，the faster the consolidation is；the larger the permeability coefficient of sand drains is，the faster the consolidation is.
