水泥固化剂提高风积沙承载性能试验  

Experiments on the bearing capacity of aeolian sand stabilized by cement stabilizers

作　　者：盛明强 邹淳 乾增珍[2] 鲁先龙 Sheng Mingqiang;Zou Chun;Qian Zengzhen;Lu Xianlong(Nanchang University,Nanchang 330031,China;China University of Geosciences(Beijing),Beijing 100083,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]南昌大学,南昌330031 [2]中国地质大学(北京),北京100083 [3]中国电力科学研究院有限公司,北京100192

出　　处：《地质科技通报》2022年第2期147-153,共7页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(52069013,52169027);国家电网公司科技项目(GC17201100065)。

摘　　要：沙漠风积沙稳定性差,采用水泥作为固化剂进行风积沙固化,是改善风积沙性质和实现风积沙资源化利用的有效手段。以取自内蒙古库布齐沙漠的风积沙为材料,制备3%含水量的重塑风积沙,掺入水泥固化剂并充分拌匀而形成固化风积沙,开展水泥固化风积沙的抗剪、抗压和抗拔承载性能试验。结果表明,水泥掺量对固化风积沙黏聚强度的提高程度要大于内摩擦角。含水量3%的风积沙掺入6%的水泥经28 d常温养护的固化风积沙无侧限抗压强度平均值为0.156 MPa。固化风积沙扩展基础抗拔荷载-位移曲线呈现初始弹性段至峰值荷载以及峰值荷载后破坏的两阶段脆性破坏特征。水泥固化提高风积沙抗拔承载性能效果显著,且与基础底板尺寸、抗拔埋深及基础深宽比等因素有关。Aeolian sands are inherently very low in strength and very poor in stability.By using local sources according to local conditions,aeolian sand stabilization with cement may be an alternative method to improve the mechanical characteristics of aeolian sand in desert areas.In this study,shear,compression and uplift bearing capacity tests were carried out on the cement-stabilized aeolian sand with 3%water content by using aeolian sand collected from the Kubuqi Desert of Inner Mongolia.The results show that cement stabilization has a much greater enhancement on the cohesive strength than that of the inner frictional angle.After 28 days of normal temperature curing,the average unconfined compressive strength of the stabilized aeolian sand with 3%water content and 6%cement content is 0.156 MPa.The uplift load-displacement curve of stabilized aeolian sand shows a two-stage change law from the initial elastic section to the peak load and failure after the peak load,which has obvious brittle failure characteristics.The results show that the uplift capacity of aeolian sand stabilized by cement is related to the foundation slab size,uplift embedment,and the ratio of uplift embedment to foundation slab width.

关 键 词：沙漠风积沙 固化风积沙 固化剂 固化土性质 承载性能 

分 类 号：TU43[建筑科学—岩土工程]