土工格室加固风积沙地基模型试验研究  

Study on Aeolian Sand Foundation Strengthened with Geocell by Model Test

作　　者：王艳坤 刘杰 宋玲[1] 张兴疆 高斌 WANG Yan-kun;LIU Jie;SONG Ling;ZHANG Xing-jiang;GAO Bin(School of Water and Architectural Engineering,Shihezi University,Shihezi Xinjiang 832003,China;Xinjiang Transport Planning,Survey and Design Institute Co.,Ltd.,Urumqi Xinjiang 830006,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]新疆交通规划勘察设计研究院有限公司,新疆乌鲁木齐830006

出　　处：《公路交通科技》2022年第7期40-48,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51669031);新疆交通设计院科研基金项目(KY2019092504)。

摘　　要：为了研究土工格室不同埋深、不同土工格室加固层数、不同加载板形状及当量换填厚度砾类土对加固风积沙地基的影响,利用室内模型试验,分析不同加固条件下地基沉降量、应力分布、位移大小及格室应变规律,并对加固效果进行对比分析;探究土工格室加固风积沙地基的合理结构形式。结果表明:正方形加载板施压的承载力高于同面积的圆形和长方形;单层加固格室埋深为0.3倍基础宽度时加固效果最好,且增加土工格室层数可有效提高地基承载力2~4倍;土工格室加固风积沙地基离基底越远,应力扩散效果越明显,单层加固中间格室土压力约降低1.5~1.8倍,多层加固降低约4.5~7.8倍;在一定情况下,单层格室加固时,格室埋深越浅受力越不均匀,越容易发生破坏,多层格室加固时,下层土工格室受力更小;采用太沙基公式对土工格室加固风积沙地基进行承载力计算,计算值相较于试验实测值误差较小,能较准确表示风积沙地基承载力值,在试验基础上对换填土公式进行修正,得出了土工格室加固风积沙的砾类土当量换填厚度。To study the influenced of different burial depths and reinforcement layers of geocells, different loading plate shapes, and gravel soil with equivalent replacement thickness on the geocell reinforcement of aeolian sand foundation, the foundation settlement, stress distribution, displacement and geocell strain rule under different reinforcement conditions are analyzed by indoor model test, and the reinforcement effect is compared and analyzed. The reasonable structural form of aeolian sand foundation strengthened with geocell is explored. The result shows that(1) The bearing capacity of square loading plate is higher than that of circular and rectangular plates with the same area.(2) When the single-layer reinforcement depth is 0.3 times of the foundation width, the reinforcement effect is the best, and increasing the geocell layers can effectively improve the foundation bearing capacity by 2-4 times.(3) The farther the strengthened foundation is from the foundation base, the more obvious the stress diffusion effect, the soil pressure in the geocell reinforced by single-layer is reduced by approximately 1.5-1.8 times, and that by reinforced by multi-layer is reduced by about 4.5-7.8 times.(4) Under certain circumstances, when reinforcing the single-layer geocell, the shallower the buried geocell, the more uneven the stress, and the easier it will be damaged. When reinforcing the multi-layer geocell, the lower geocell is under less stress.(5) The bearing capacity of aeolian sand foundation strengthened with geocell is calculated by using Terzaghi formula. Compared with the measured value in the test, the error of the calculated value is smaller, it can more accurately represent the bearing capacity of the aeolian sand foundation. On the basis of the test, the soil replacement formula is revised, and the equivalent replacement thickness of gravel soil for aeolian sand foundation strengthened with geocell is obtained.

关 键 词：道路工程 风积沙地基 模型试验 承载力 换填土 

分 类 号：TU472.99[建筑科学—结构工程]