Analysis of energy pile groups subjected to non-uniform thermal loadings

Sequentially coupled thermal-stress finite element analyses were performed to investigate the mechanical behaviors of an energy pile group subjected to non-uniform thermal loadings.The group effect was highlighted by comparing the thermo-mechanical responses with those of the single pile case.Due to the thermal interactions between piles,the group piles’temperatures were higher than that of the isolated single pile.If only part of the piles served as heat exchangers,i.e.,the pile group was thermal loaded unevenly,there were dif-ferential deformations between the heated and the non-heated piles.Due to the pile-raft-pile interaction,the axial forces of the piles chan-ged significantly.The location of the heated pile had an important influence on the thermally induced axial force,while the effect of the soil’s coefficient of thermal expansion was not significant.Inspired by the numerical result,a simplified method was proposed to capture the main characteristics of energy pile groups and to facilitate the design.The proposed method was developed in the framework of the traditional load transfer approach,and the pile-raft-pile interaction was included.By applying different temperature increments to dif-ferent piles,the non-uniform thermal loading was modeled.The proposed method was verified by comparing with the finite element anal-ysis results and the data collected from the literature.

刺络放血拔罐结合电针围刺治疗带状疱疹后神经痛临床观察

Objective:To explore the clinical efficacy of collateral-pricking and blood-letting cupping combined with surrounding needling technique electroacupuncture in the treatment of post-herpetic neuralgia(PHN).Methods:Seventy-two patients with post-herpetic neuralgia were randomized into observation group and control group.Of the 72 cases,12 cases fell off,so finally 30 cases in each group.The observation group was treated with collateral-pricking and blood-letting cupping combined with surrounding needling technique electroacupuncture,while the control group was treated simply with pregabalin capsules for 20 consecutive days.On the basis of the western medication pregabalin capsules,the same as that of the control group,collateral-pricking and blood-letting cupping combined with electroacupuncture in a surrounding needling technique,was adopted for the observation group,once every two days,ten days as one course of treatment,a total of two courses.The immediate visual analogue scale(VAS)before and after treatment were observed in the two groups,and their clinical effects were compared.Results:The VAS scores of PHN patients in the two groups after treatment were lower than those before treatment(both P<0.01),and the scores of observation group were lower than those of control group(P<0.05).The total effective rate of the observation group was 86.7%,higher than 73.3% of the control group.Conclusion:The clinical effect of collateral-pricking and blood-letting cupping combined with electroacupuncture is relatively satisfactory in the treatment of post-herpetic neuralgia.