基于实际工程的场地黏土分析与评价

Analysis and evaluation of site clay based on practical engineering

工程场地的地质条件是工程安全的基础。本文基于实际工程案例,对场地粉质黏土进行了分析与评价。在场地不同深度进行钻探取样,然后开展了土工试验和标准贯入试验。首先,根据土工试验研究了压缩系数A_(v(1-2))、压缩模量E_(s(1-2))、粘聚力c、内摩擦角φ和自由膨胀率随取样深度的变化规律;其次,根据《建筑地基基础技术规范》、土工试验和标准贯入试验研究了不同土层的压缩模量和承载力建议值。研究结果给出了针对不良地质作用及特殊性岩土的应对措施,并给出了不同土层承载力特征值f_(ak)值以及压缩模量E_(s(1-2))值的建议值,同时对各土层进行了全面评价,可为类似实际工程提供借鉴意义。

The geological condition of engineering site is the foundation of engineering safety.Based on practical engineering cases,this paper analyzes and evaluates silty clay of the site.Drilling samples were taken at different depths of the site,and then geotechnical tests and standard penetration tests were carried out.Firstly,the variation of compression coefficient,compression modulus,cohesion,internal friction angle and free expansion rate with sampling depth were studied based on geotechnical tests.Secondly,the recommended values of compression modulus and bearing capacity of different soil layers were studied according to the code,geotechnical test and standard penetration test.The research results give the countermeasures of adverse geological processes and special rock and soil,and give the suggested values of the characteristic value of bearing capacity value(f_(ak)),and compression modulus value E_(s(1-2))of different soil layers.At the same time,the comprehensive evaluation of each soil layer was carried out,which can provide a reference for similar practical projects.