延安新区压实黄土抗剪强度试验研究  

Experimental study of the shear strength of compacted loess in Yan'an new district fracture energy of concrete

作　　者：李旭东[1] 黄雪峰[2] 杨佳[1] 汪正金 LI Xudong;HUANG Xuefeng;YANG Jia;WANG Zhengjin(Navy of Institute of Engineering Design&Research,Beijing 100070,China;Department of Civil Engineering,Logistical Engineering University of PLA,Chongqing 401331,China)

机构地区：[1]海军工程设计研究院,北京100070 [2]解放军后勤工程学院军事土木工程系,重庆401331

出　　处：《河北工程大学学报（自然科学版）》2018年第1期19-23,共5页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家科技支撑计划(2013BAJ06B00);陕西省科技统筹创新工程计划(2012KTDZD03-04)

摘　　要：压实黄土的抗剪强度是影响黄土高填方边坡稳定性的重要因素。对延安新区压实Q_2、Q_3黄土开展了多组不同初始压实度和初始含水率条件下的直剪试验,研究了压实度、含水率对黏聚力、内摩擦角和抗剪强度的影响,初步探讨了现场回填压实黄土和室内制备压实黄土表现出不同抗剪强度特性的原因。结果表明:黏聚力和内摩擦角均随着压实度的增大而增大,土中粘粒含量对压实Q_2、Q_3黄土的黏聚力和内摩擦角指标有较大影响;黏聚力、内摩擦角和抗剪强度均随含水率的增大而不断减小,压实Q_2黄土对含水率变化更为敏感;现场回填压实黄土比室内制备的压实黄土具有更高的抗剪强度。The shear strength of compacted loess is an important factor which seriously influencing the stabilization of the high loess-filled project.In order to study how the compaction degree and water content influence the shear strength,a series of direct shear tests with different initial compaction degrees and initial water contents are carried out for compacted Q2 loess and Q3 loess in Y an?an new district.Then,a preliminary discussion is conduct tofind out the shear strength difference between compacted loess from backfill and samples prepared in laboratory.The results show that cohesion and internal friction angle increase with the increase of compaction degree,the clay content in compacted loess has a great influence on the cohesion and internal friction angle.Cohesion,internal friction angle and shear strength decrease with the increase of water content,and compacted Q2 loess is more sensitive to water.The shear strength of compacted loess from backfill is much higher than samples prepared in laboratory.

关 键 词：压实黄土 压实度 含水率 黏聚力 内摩擦角 

分 类 号：TU44[建筑科学—岩土工程]