摘要
为保证超百米深厚细砂覆盖层的注浆加固效果,保障工程长期安全运行,在对国内外现有旁压试验规范剖析的基础上,提出超百米旁压试验的测试方法和参数取值存在的问题和不足,后以某超百米深厚细砂覆盖层中的旁压试验为应用实例,对其注浆加固效果做了深入比较分析。结果表明:①因原始水平地应力复杂且试验成孔不能保证,超百米深厚细砂覆盖层旁压试验特征参数初始压力P_(0)的取值不能简单以作图法或计算法获取,需进一步深入研究;②可以利用旁压特征参数旁压模量(E_(M))、临塑压力(P_(f))作为超百米深厚细砂覆盖层注浆效果评价的关键指标;③经袖阀管注浆加固超百米扰动细砂层后,承载特性指标P_(f)提高约4.7倍,变形特性指标E_(M)提高约7.3倍。
To ensure the grouting reinforcement effect of deep fine sand overburden layers,ensuring the long-term safety and stability of the construction.After analyzing the existed international and domestic side pressure test standards,the shortcomings and issues in test methods and parameter selection for pressuremeter tests exceeding a hundred meters in depth was proposed,then a specific case of deep overburden with fine sand over 100 meters was taken into account to make an in-depth comparative analysis for the grouting reinforcement effect.The results showed that:①Due to the complexity of the original horizontal stress and uncertainties in borehole creation,the initial pressure value P_(0)for pressuremeter tests in deep overburden with fine sand over 100 meters cannot be simply obtained through the methods like graphical or calculational,and further research should be conducted.②The characteristic parameters of lateral pressure-bearing capacity,such as the plastic limit pressure(P_(f))and lateral pressure modulus(E_(M)),could be used as the primary indicators to evaluate the effectiveness of grouting reinforcement in thick overburden layers.③After reinforcement with sleeve-valve pipe grouting in the disturbed thick overburden layers,the characteristic parameter P_(f)increased by approximately 4.7 times,and the deformation characteristic parameter E_(M)would increased by approximately 7.3 times.
作者
王汉武
王天成
胡胜刚
黄宏阳
WANG Hanwu;WANG Tiancheng;HU Shenggang;HUANG Hongyang(Key Laboratory of Geomechanics and Geotechnical Engineering ofthe Ministry of Water Resources,ChangJiang River Scientific Institute,Wuhan 430010,China)
出处
《水利水电快报》
2024年第9期79-84,共6页
Express Water Resources & Hydropower Information
关键词
旁压试验
深厚覆盖层
注浆加固
效果评价
pressuremeter test
deep overburden
reinforcement effect of grouting
effect assessment
