极度干旱区板块状盐渍土路用性能试验  

Road performance test of plate-like saline soil in extremely arid regions

作　　者：乌延玲[1,2] 冯忠居[1] 王廷武 刘小飞[4] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]赤峰市公路管理处,内蒙古赤峰024000 [3]新疆维吾尔自治区交通厅,新疆乌鲁木齐830000 [4]广东省公路勘察规划设计院有限公司,广东广州510507

出　　处：《长安大学学报（自然科学版）》2011年第1期31-35,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：新疆维吾尔自治区交通科技项目(200609251)

摘　　要：为解决新疆红鄯(红山口—鄯善)高速公路沿线板块状盐渍土用于工程建设的问题,基于渗透试验、无侧限抗压强度试验、CBR试验和承载力试验,研究了板块状盐渍土的路用性能。结果发现:板块状盐渍土的天然抗压强度受含盐量分布不均匀、土样级配不同和试件尺寸效应等因素的影响,其值为2.8～28.6 Pa,相差极大;板块状盐渍土的CBR值高达120%,远大于非板块状盐渍土的CBR值(28.6%),其弯沉值远小于设计弯沉值。这些结果说明,在工程实际中控制水的浸入,就可以充分利用板块状盐渍土作为路基的地基;结合渗透性试验成果和新疆红鄯高速公路周边环境的气候条件与降雨特征,提出对现场粗粒、细粒板块状盐渍土区段盐溶的深度处理分别为80 cm和50 cm。In order to solve the engineer application problems of the plate-like saline soil of Hongshankou--Shanshan freeway in Xinjiang, this paper studies the road performance of the plate-like saline soil, based on the permeability test, unconfined compression strength test, CBR test and bearing test. The result shows that the value of plate-like saline soil＇s natural strength ranges widely from 2.8 to 28.6 Pa, conditioned by the uneven distribution of salinity, different gradation and size effects of soil sample and other factors. The CBR value is 120% and much greater than the one of non-plate-like saline soil, which is 28.6 % and much less than the design deflection. This data indicates that the plate-like saline soil can be used as the subgrade if the immersion of water can be control properly. Permeability tests＇ results give the salt in depth are 80 cm and 50 m respectively about coarse-grained soil and fine-grained soil, combined with the surrounding environment in Xinjiang weather conditions and rain capacity along with Hongshankou--Shanshan freeway. 7 tabs, 7 figs, 9 refs.

关 键 词：道路工程 路基 板块状盐渍土 路用性能 强度特性 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU448[建筑科学—岩土工程]