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| 我国北方新生代玄武岩地下水化学特征及其成因：以河北省张北县为例 | |
| 引用本文： | 李晴芳,汪柱,于洋.我国北方新生代玄武岩地下水化学特征及其成因：以河北省张北县为例[J].吉林大学学报(地球科学版),2022,52(1):171-180. |
| 作者姓名： | 李晴芳 汪柱 于洋 |
| 作者单位： | 1.吉林大学新能源与环境学院，长春130021 2.中国地质调查局水文地质环境地质调查中心，河北保定071051 3.山东科技大学地球科学与工程学院，山东青岛266590 |
| 基金项目： | 国家重点研发计划项目(2016YFC1401202);自然资源部浙江地质灾害野外观测研究站开放基金(ZJDZGCZ-2021)。 |
| 摘 要： | 为了进一步了解我国北方新生代玄武岩地下水的赋存规律和形成演化机理，以河北省张北县玄武岩地下水为研究对象，在野外采集地下水样、测定水化学和同位素组成的基础上，利用统计分析、离子比例系数、氢氧同位素、反向地球化学模拟等方法，对区内玄武岩地下水的水化学形成机制进行了研究。结果表明：沿地下水径流方向，研究区内玄武岩地下水中多数离子质量浓度呈现增大趋势，补给区的地下水化学类型以HCO3Ca·Mg为主，TDS质量浓度多小于500 mg/L，排泄区地下水中阴离子以Cl-和SO2-4为主，阳离子以Na+为主，TDS质量浓度多大于1 400 mg/L；研究区地下水补给来源为当地大气降水；硅铝酸盐、岩盐、硫酸盐的风化溶解是地下水中离子的主要来源；溶滤作用、阳离子交替吸附作用和农业施肥等人类活动影响是控制地下水化学形成的主要作用。 |
| 关 键 词： | 地下水 水化学 稳定同位素 玄武岩 河北省张北县 |
| 收稿时间： | 2021-08-04 |
Optimization of Area Replacement Ratio of Stone Column Based on Robustness Principle |
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| Li Qingfang,Wang Zhu,Yu Yang.Optimization of Area Replacement Ratio of Stone Column Based on Robustness Principle[J].Journal of Jilin Unviersity:Earth Science Edition,2022,52(1):171-180. | |
| Authors: | Li Qingfang Wang Zhu Yu Yang |
| Institution: | 1. College of New Energy and Environment，Jilin University，Changchun 130021,China 2. Center for Hydrochemistry and Environmental Geology，China Geological Survey， Baoding 071051，Hebei，China 3. College of Geosciences and Engineering，Shandong University of Science and Technology，Qingdao 266590，Shandong，China |
| Abstract: | Determination of the specific area replacement ratio is crucial in construction， considering the uncertainty of mechanical parameters of soft soil itself and the balance between post construction settlement satisfaction and cost. Based on the robust geotechnical design principle, the pile and soil constrained modulus is regarded as noise factors with uncertainty, and by using the Monte Carlo simulation method the value of several possible noise factors is determined; Further, the standard deviation of post construction settlement is calculated by the one way layer wise summation method as the measure of robustness; Finally, the area replacement ratio of gravel pile could be optimized with considering safety, cost and robustness simultaneously. In this study, a robust design framework of stone column was proposed and its application was illustrated through an engineering example. Based on this example, the influence rules of settlement limit, coefficient of variation of compression modulus, and parameter distribution mode on the optimization were discussed. The results show that the optimal replacement rate is 29%; The improvement of settlement limit increases the engineering cost; The compressive modulus of soil has a greater influence on the final optimization than that of gravel pile; When using normal instead of lognormal distribution to simulate the noise factor distribution, the results of this calculation are more uncertain. |
| Keywords: | constrained modulus stone column composite foundation optimization design area replacement ratio robustness |
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