硅藻土层水平抗力系数的比例系数m值试验研究

硅藻土是一种特殊性质的土,其工程力学特性的研究相对较少,尤其是工程上常用的地基土水平抗力系数的比例系数m值,针对m值的研究更少。在硅藻土地层桥梁灌注桩水平承载力设计中,m值的大小非常重要,却缺乏有效的取值依据。本文依托新建杭绍台高铁工程,在硅藻土试验区开展了3根灌注桩的水平静载荷试验,得到了桩侧地基土水平抗力系数的比例系数m值,根据硅藻土强度试验指标和相关规范方法进行计算,得到了白色、兰色和黑色三类硅藻土的m值,经验证与测试桩水平静载试验结果一致。研究成果可为硅藻土地层桥梁桩基或类似工程的设计参数取值提供参考。

Field test study on the proportional coefficient m value of horizontal resistance coefficient of diatomaceous soil layer

Diatomite is a kind of soil with special properties. The study of its engineering mechanical properties is relatively few, especially the ratio coefficient m of horizontal resistance coefficient of foundation soil commonly used in engineering, and the study of m value is less. In the design of horizontal bearing capacity of bored pile for bridge in diatomite soil layer, the magnitude of m value is very important, but there is no effective basis for value selection. Based on the newly-built Hangzhou-Shaotai high-speed railway project, the horizontal static load tests of three bored piles were carried out in the diatomite test area, and the proportional coefficient m of the horizontal resistance coefficient of the foundation soil around the pile was obtained. The m values of white, blue and black diatomite were calculated according to the strength test index of Diatomite and the relevant normative methods. The m values are verified and tested by the horizontal static load test results of test piles. The results can provide reference for the design parameters of bridge pile foundation or similar engineering in diatomite soil stratum.