含水率对冻结粉质黏土力学性能的影响  

EFFECT OF THE MOISTURE CONTENT ON MECHANICAL PROPERTIES OF FROZEN SILTY CLAY

作　　者：卢召红[1] 王凯勃 王尊策[1,2] 张栋 闫锋 欧阳欣[2] LU Zhaohong;WANG Kaibo;WANG Zunce;ZHANG Dong;YAN Feng;OUYANG Xin(Northeast Petroleum University,Daqing 163318,China;CNPC Key Laboratory of Oil&Gas Storage and Transportation,PetroChina Pipeline R&D Center,Langfang 065000,China)

机构地区：[1]东北石油大学,黑龙江大庆163318 [2]中国石油管道科技研究中心中国石油天然气集团公司油气储运重点实验室,河北廊坊065000

出　　处：《工业建筑》2021年第3期153-157,97,共6页Industrial Construction

基　　金：国家自然科学基金项目(51578120);国家自然科学青年基金项目(11402051)。

摘　　要：通过对大庆市季节性冻土区冻结粉质黏土不同含水率下抗剪和抗压力学性能的试验,得到低温度下黏聚力c、内摩擦角φ、抗剪强度及抗压强度与含水率的变化规律,以及最优含水率对其抗剪强度和抗压强度的影响;并对其初始弹性模量进行分析。研究结果表明:冻结粉质黏土的黏聚力c、内摩擦角φ随着含水率的增大呈现出先增后减趋势;其抗剪强度随着含水率的增加呈先增后减最后趋于稳定,且在最优含水率处达到最大值;抗压强度随着含水率的增大呈现先增后减的趋势,在含水率为25%左右时达到最大值,且抗压强度大小与最优含水率无关;其初始弹性模量随着含水率的增加呈现出先增后减的趋势。The experimental analysis on shear and compressive mechanical properties of frozen silty clay in the seasonal frozen soil region of Daqing City was conducted.The variable rules of the cohesion,internal friction angles,shear strength,compressive strength and moisture content at low temperature and the influence of the optimum moisture content on shear strength and compressive strength were obtained,and the variable rules of initial elastic modulus were analyzed.The results showed that the cohesion and internal friction angle of the frozen silty clay presented a variable rule of first increase and then decrease with the increase of the moisture content;the shear strength increased first and then decreased with the increase of the moisture content,and finally tended to be stable;the shear strength was maximum at the optimum moisture content;the compressive strength increased first and then decreased with the increase of the moisture content,the compressive strength was maximum at the moisture content of 25%,and the compressive strength was unrelated to the optimal moisture content;the initial elastic modulus presented a variable rule of first increase and then decrease with the increase of the moisture content.

关 键 词：冻结粉质黏土 最优含水率 剪切性能 抗压性能 初始弹性模量 

分 类 号：TU445[建筑科学—岩土工程]