Method for density correction of deep sand
By combining large-diameter borehole sampling and freezing method with triaxial creep testing, the accuracy problem of in-situ density measurement of deep sand was solved, achieving high-precision density correction and ensuring the safety and economy of the project.
CN122409417APending Publication Date: 2026-07-17CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
- Filing Date
- 2026-06-11
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing technologies make it difficult to accurately measure the in-situ density of deep sand, resulting in lower measured values and affecting the safety and stability of engineering projects.
Method used
Large-diameter borehole sampling combined with freezing method was used to prepare soil samples. The volumetric deformation parameters of the soil samples were monitored by triaxial creep test. Based on the stable volumetric deformation parameters, the in-situ density and porosity were derived to simulate the in-situ structure and stress state of the soil samples.
Benefits of technology
It improves the accuracy of in-situ density measurement of deep sand, ensures the safety and economy of engineering design, and reduces engineering costs.
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Figure CN122409417A_ABST
Abstract
本发明公开的是土层密度测量领域的用于深部砂土的密度修正方法，包括如下步骤，S1：钻孔取样；S2：冰冻法制样；S3：三轴蠕变试验，获取土样的干密度和孔隙率；基于现场土层情况获取所处环境的上覆有效应力和横向有效应力；将冰冻样品置于三轴仪，融化后进行水头饱和，固结排水后加载预设轴向应力a和侧向应力b；同时监测样品随时间变化的体变参数；并在实验终止时获取稳定体变；S4：试验数据处理，根据推算修正后的原位孔隙率和原位干密度；通过钻孔‑制样‑三轴试验‑数据推导多步骤协调，在取样制样过程中保证土样原位结构，三轴蠕变试验及数据计算推导过程还原砂土原位密度，提升土样原位密度的测量精度。
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