东北地区季节性冻土对监测点稳定性的影响

Influence of Seasonal Frozen Soil on Stability of Monitoring Sites in Northeast China

为定量把握冻土对沉降监测网点的稳定性影响,降低测点施工成本,在东北地区通过实际项目数据研究分析监测点稳定性受季节性冻土的影响情况。结果表明12月-次年2月期间,随着温度逐渐降低至0℃以下,冻土深度加深,监测点沉降量逐渐增大,2月-3月冻土深度达到最深,监测点累计沉降量最大达到1 cm。温度对冻土深度的形成有较大影响,温度降低时,冻土深度加深,监测点被抬升,随着温度的升高,冻土深度降低,监测点开始下降,最终趋于稳定。研究结果能有效指导沉降监测点施工,并降低造价成本。

For quantitative analysis of the permafrost stability analysis of subsidence monitoring network,to reduce the construction cost of measuring points,in the northeast region,the actual project data analysis is performed. The results show that during December to February,as the temperature gradually reduced to less than 0 ℃,frozen soil depth,settlement monitoring points increases gradually,February and march,frozen soil depth to achieve the minimum,monitoring the cumulative settlement up to 1 cm. Temperature has a direct impact on the frozen soil depth,and has a great impact on the formation of frozen soil depth. When the temperature drops,the frozen soil depth deepens and the monitoring point is lifted. With the increase of temperature,the frozen soil depth decreases,and the monitoring point starts to decline and finally tends to be stable.