Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods.Many studies indicate that the soil electrical potential i...Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods.Many studies indicate that the soil electrical potential is non-linearly distributed in the treatment process by the combined method.However,in the previous theoretical study,the non-linear-distribution impacts of soil’s electrical potential on soft soil foundation treatment have not been considered.It is always assumed to be linear distribution,which is different from the experimental results.In this paper,the coupling consolidation model of this technology under the two-dimensional plane strain condition is initially established;and the well resistance effect,the vacuum load decreasing along the soil depth and the non-linear variation of electrical potential in the soil are considered.Then,the analytical solutions of the average excess pore water pressure and soil’s consolidation degree in the anode affected area are acquired based on the soil’s electrical potential distribution.Finally,the rationality of the analytical solution is testified by conducting an experimental model test,which proves the scientificity of the analytical solution.The analytical solution is adopted to better predict the dissipation of excess pore water pressure and soil consolidation degree when using the combined technology.This study can provide a reference with more accuracy for the engineering practices of this combined technology in the future.展开更多
目的:探讨日均气温对兰州市细菌性痢疾发病的影响及其滞后效应。方法:收集兰州市2008—2015年每日细菌性痢疾发病资料,结合同期气象资料,利用分布滞后非线性模型(distributed lag non-linear model,DLNM)分析日均气温与细菌性痢疾发病...目的:探讨日均气温对兰州市细菌性痢疾发病的影响及其滞后效应。方法:收集兰州市2008—2015年每日细菌性痢疾发病资料,结合同期气象资料,利用分布滞后非线性模型(distributed lag non-linear model,DLNM)分析日均气温与细菌性痢疾发病的关联性。结果:日均气温与细菌性痢疾发病的暴露-反应关系呈"J"型,最低发病温度为17℃,对不同性别、年龄人群高温效应影响均大于中间效应。高温效应和中间效应对男、女性人群均表现为急性作用,当天的效应值最高,随后波动下降,高温效应对女性影响更大。在不同年龄段人群中,0~3岁组人群的细菌性痢疾发病的高温效应和中间效应均最大;高温效应和中间效应对0~3岁、19~64岁人群均表现为急性作用,当天的效应值最高,随后波动下降,而≥65岁者当天发病,之后下降,再缓慢波动上升。相对于最低发病温度17℃,高温(32℃)和中间温度(26℃)均能增加细菌性痢疾发病的风险,以滞后14 d累计效应最大,在男性、女性、0~3岁、4~11岁、12~18岁、19~64岁、≥65岁人群中,中间温度对细菌性痢疾发病RR(95%CI)值分别为2.30(1.53~3.13)、2.45(1.65~3.30)、2.41(1.59~3.28)、2.54(1.40~3.79)、1.82(0.41~3.43)、1.98(1.11~2.93)、1.73(0.68~2.88),高温时RR(95%CI)值分别2.93(1.38~4.69)、3.08(1.48~4.9)、3.26(1.60~5.16)、3.12(1.06~5.56)、1.94(0.73~5.39)、2.31(0.54~4.36)、2.06(0.02~4.51)。结论:高温可显著增加细菌性痢疾的发病风险,女性和3岁以下人群是敏感人群。气象因素在兰州市细菌性痢疾的发生和发展中发挥重要作用,细菌性痢疾发病受到多种气象因子共同作用的影响,但首要影响因素是高温。气温对细菌性痢疾发病不是直接作用,而是通过影响细菌性痢疾发病的各个环节(居民生活习惯、传播途径与易感人群自身体质),间接影响细菌性痢疾在人群中的分布。展开更多
基金Project(51979087)supported by the National Natural Science Foundation of ChinaProject(BK20180776)supported by the Jiangsu Natural Science Foundation,ChinaProject(202006710002)supported by the China Scholarship Council。
文摘Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods.Many studies indicate that the soil electrical potential is non-linearly distributed in the treatment process by the combined method.However,in the previous theoretical study,the non-linear-distribution impacts of soil’s electrical potential on soft soil foundation treatment have not been considered.It is always assumed to be linear distribution,which is different from the experimental results.In this paper,the coupling consolidation model of this technology under the two-dimensional plane strain condition is initially established;and the well resistance effect,the vacuum load decreasing along the soil depth and the non-linear variation of electrical potential in the soil are considered.Then,the analytical solutions of the average excess pore water pressure and soil’s consolidation degree in the anode affected area are acquired based on the soil’s electrical potential distribution.Finally,the rationality of the analytical solution is testified by conducting an experimental model test,which proves the scientificity of the analytical solution.The analytical solution is adopted to better predict the dissipation of excess pore water pressure and soil consolidation degree when using the combined technology.This study can provide a reference with more accuracy for the engineering practices of this combined technology in the future.
文摘目的:探讨日均气温对兰州市细菌性痢疾发病的影响及其滞后效应。方法:收集兰州市2008—2015年每日细菌性痢疾发病资料,结合同期气象资料,利用分布滞后非线性模型(distributed lag non-linear model,DLNM)分析日均气温与细菌性痢疾发病的关联性。结果:日均气温与细菌性痢疾发病的暴露-反应关系呈"J"型,最低发病温度为17℃,对不同性别、年龄人群高温效应影响均大于中间效应。高温效应和中间效应对男、女性人群均表现为急性作用,当天的效应值最高,随后波动下降,高温效应对女性影响更大。在不同年龄段人群中,0~3岁组人群的细菌性痢疾发病的高温效应和中间效应均最大;高温效应和中间效应对0~3岁、19~64岁人群均表现为急性作用,当天的效应值最高,随后波动下降,而≥65岁者当天发病,之后下降,再缓慢波动上升。相对于最低发病温度17℃,高温(32℃)和中间温度(26℃)均能增加细菌性痢疾发病的风险,以滞后14 d累计效应最大,在男性、女性、0~3岁、4~11岁、12~18岁、19~64岁、≥65岁人群中,中间温度对细菌性痢疾发病RR(95%CI)值分别为2.30(1.53~3.13)、2.45(1.65~3.30)、2.41(1.59~3.28)、2.54(1.40~3.79)、1.82(0.41~3.43)、1.98(1.11~2.93)、1.73(0.68~2.88),高温时RR(95%CI)值分别2.93(1.38~4.69)、3.08(1.48~4.9)、3.26(1.60~5.16)、3.12(1.06~5.56)、1.94(0.73~5.39)、2.31(0.54~4.36)、2.06(0.02~4.51)。结论:高温可显著增加细菌性痢疾的发病风险,女性和3岁以下人群是敏感人群。气象因素在兰州市细菌性痢疾的发生和发展中发挥重要作用,细菌性痢疾发病受到多种气象因子共同作用的影响,但首要影响因素是高温。气温对细菌性痢疾发病不是直接作用,而是通过影响细菌性痢疾发病的各个环节(居民生活习惯、传播途径与易感人群自身体质),间接影响细菌性痢疾在人群中的分布。
