岩土工程地质勘察中的原位测试技术分析

Analysis of In-situ Testing Technology in Geotechnical Engineering Geological Investigation

为更直观地掌握岩土工程地质结构参数,以某岩土工程项目为例,引进原位测试技术,对工程地质勘察的方法展开设计。选择地震波速度测定法,对该工程场地的土层进行原位测试,根据测试需求,进行岩土工程地质勘察中原位测试现场的布置;应按照工程特点和地质层状条件,每下深1 m布置一个测点,由下至上,根据工程场地实际情况与原位测试要求进行;计算场地剪切波的波速,根据计算结果,划分场地中地质剖面;参照无限体表面弹性理论,计算场地的变形模量;根据地基土参数,绘制对应的P-vs曲线,根据P-vs曲线上的不同点位取值,掌握岩土工程对应土体的物理指标,完成原位测试方法的设计。实例应用实验结果表明:设计的方法应用效果良好,按照规范进行岩土工程勘察中的原位测试工作,可以提高地质勘察结果的真实性与可靠性。

In order to grasp the parameters of geotechnical engineering geological structure more directly,taking a geotechnical engineering project as an example,the in-situ testing technology is introduced to design the engineering geological investigation method.The seismic wave velocity measurement method is selected to test the soil layer of the engineering site in situ.According to the test requirements,the layout of the in-situ test site is carried out.According to the engineering characteristics and geological stratified conditions,a measuring point should be arranged every 1 m depth,from bottom to top,according to the actual situation of the project site and in-situ testing requirements;The shear wave velocity of the site is calculated,and the geological section of the site is divided according to the calculated results.The deformation modulus of the site is calculated according to the elastic theory of the infinite body surface.According to the parameters of the foundation soil,the corresponding P-vs curve is drawn,and the values of different points P-vs on the curve are taken to master the physical indexes of the soil corresponding to the geotechnical engineering,and the design of the in-situ test method is completed.The experimental results show that the designed method has good application effect,and the authenticity and reliability of geological investigation results can be improved by in-situ testing in accordance with the codes.