依兰晨光电站抢险的工程地质分析研究

Research on Geology Analysis in Emergency of Yilan Chenguang Power Station

2019年依兰晨光泄洪冲砂闸突然倒塌,需要对电站进行抢险指导工作。首先采用了地质调绘、钻探、坑探等手段进行勘察,查明冲砂闸地段覆盖层厚度,成因类型,及组成物,评价其对坝基、坝肩稳定和渗漏的可能影响,并进行地震液化判别。经分析得知:工程区地震动峰值加速度为0.20 g,地震动反应谱特征周期为0.35 s,对应的地震基本烈度为Ⅷ度,同时进行了取样试验工作。通过进行岩土体物理力学性质试验,得出有关物理力学参数。并结合依兰晨光目前的工程地质和水文地质条件进行工程地质分析,查明老厂房取水口前缘渗漏、脱空范围等地质缺陷,对存在的主要工程地质问题提出解决办法及建议,为修复设计提供依据。

In 2019,the reservoir of Yilan Chenguang flood discharge and sand flushing gate suddenly collapsed,and rescue and guidance for the power station is required.First,the survey was conducted by means of geological surveying,drilling,and pit exploration.Find out the thickness,genetic type,and composition of the overburden in the sand gate section.Evaluate its possible effects on the stability and leakage of the dam foundation and abutment,and perform seismic liquefaction discrimination.After analysis,it is found that the peak acceleration of the project area is 0.20g;the characteristic period of the motion response spectrum is 0.35s corresponding basic earthquake intensityⅧ.At the same time,sampling testing work was carried out.The author conducts tests on the physical and mechanical properties of rock and soil and obtains relevant physical and mechanical parameters.Combined with the current engineering geological and hydrogeological conditions of Yilan Chenguang,the engineering geological analysis of the project can be carried out well.To find out the geological defects such as leakage at the front edge of the water intake of the old factory building,we evaluate the existing major engineering geological problems and propose treatment measures to provide a basis for the restoration design.