A Numerical Study on Effects of Land-Surface Heterogeneity from' Combined Approach' on Atmospheric ProcessPart II: Coupling-Model Simulations

Two land surface schemes, one the standard Biosphere / Atmosphere Transfer Scheme Version ie (BOZ) and the other B1Z based on B0Z and heterogeneously-treated by' combined approach' , were co 'pled to the meso-scale model MM4, respectively. Through the calculations of equations from the companion paper, parameters representing land surface heterogeneity and suitable for the coupling models were found out. Three cases were simulated for heavy rainfalls during 36 hours, and the sensitivity of short-term weather modeling to the land surface heterogeneity was tested. Through the analysis of the simulations of the three heavy rainfalls, it was demonstrated that BIZ, compared with BOZ, could more realistically reflect the features of the land surface heterogeneity, therefore could more realistically reproduce the circulation and precipitation amount in the heavy rainfall processes of the three cases. This shows that even short-term weather is sensitive to the land surface heterogeneity, which is more obvious with time passing, and whose influence is more pronounced in the lower layer and gradually extends to the middle and upper layer. Through the analysis of these simulations with BlZ, it is suggested that the bulk effect of smaller-scale fluxes (i.e., the momentum, water vapor and sensible heat fluxes) near the s ig nificantly-heterogeneous land surface is to change the larger-scale (i.e., meso-scale) circulation, and then to influence the development of the low-level jets and precipitation. And also, the complexity of the land-atmosphere interaction was shown in these simulations.

A Numerical Study on Effects of Land-Surface Heterogeneity from "Combined Approach" on Atmospheric Process Part I: Principle and Method

A method based on Giorgi (1997a, 1997b) and referred to as ’ combined approach’, which is a combi-nation of mosaic approach and analytical-statistical-dynamical approach, is proposed. Compared with those of other approaches, the main advantage of the combined approach is that it not only can represent both interpatch and intrapatch variability, but also cost less computational time when the land surface heterogeneity is considered. Because the independent variable of probability density function (PDF) is ex-tended to the single valued function of basic meteorological characteristic quantities, which is much more universal, the analytical expressions of the characteristic quantities (e.g., drag coefficient, snow coverage, leaf surface aerodynamical resistance) affected by roughness length are derived , when the roughness length(and / or the zero plane displacement) heterogeneity has been mainly taken into account with the approach. On the basis of the rule which the PDF parameters should follow, we choose a function y of the roughness length z 0 as the PDF independent variable, and set different values of the two parameters width ratio αn and height ratio γ of PDF (here a linear, symmetric PDF is applied) for sensitivity experiments, from which some conclusions can be drawn, e.g., relevant characteristic terms show different sensitivities to the heterogeneous characteristic (i.e., roughness length), which suggests that we should consider the heterogeneities of the more sensitive terms in our model instead of the heterogeneities of the rest, and which also implies that when the land surface scheme is coupled into the global or regional atmospheric model, sensitivity tests against the distribution of the heterogeneous characteristic are very necessary; when the parameter αn is close to zero, little heterogeneity is represented, and αn differs with cases, which have an upper limit of about 0.6; in the reasonable range of αn, a peak-like distribution of roughness length can be depicted by a small value of γ, etc.. Key words Representation of land surface heterogeneity - “ Combined approach” - Numerical experiment This work was supported by the National Sciences Foundation of China, Grant No.49875005 and the State Key Project (973) G19990434 (03).

Combining ability and gene action studies for yield and fibre traits in Gossypium arboreum using Griffings numerical and Haymans graphical approach

Background For the purpose of utilising hybrid vigour to produce possible hybrids with a suitable level of stability,the knowledge of gene activity and combining ability is a crucial prerequisite before choosing desirable parents.The present study was carried out with six parents crossed in full diallel fashion and generated 30 F1 hybrids.These hybrids were evaluated in two replications in Randomized Block Design at Department of Cotton,TNAU for combining ability and gene action.Diallel analysis was carried out according to Griffing’s method-I(parents + F_(1) + reciprocals) and model-I and Hayman’s graphical approach by using INDOSTAT software.Results Analysis of variance for combining ability indicated that mean square values of GCA,SCA and reciprocals were highly significant for all the traits except for the uniformity index.RG763 and K12 showed highly positively significant GCA effects for most of the yield traits while PA838 and K12 for fibre quality traits,so they were found as best general combiners.PAIG379 × K12 and PDB29 × K12 for yield traits,and PDB29 × PA838,RG763 × PA838,and CNA1007 × RG763 cross combinations for fibre quality traits could be recommended for future breeding programms.Conclusion The results of both Griffing’s and Hayman’s approaches showed that non-additive gene action predominates as SCA variance was bigger than GCA variance,so heterosis breeding is thought to be a more fruitful option for enhancing GCA of many traits.

Effectiveness and postoperative rehabilitation of one-stage combined anterior-posterior surgery for severe thoracolumbar fractures with spinal cord injury

BACKGROUND Thoracolumbar fractures are generally combined with spinal cord injury to varying degrees,which may cause deterioration of the patients’condition and increase the difficulty of clinical treatment.At present,anterior or combined anterior-posterior surgery is preferred for severe thoracolumbar fractures.AIM To investigate the effectiveness and postoperative rehabilitation of one-stage combined anterior-posterior surgery for severe thoracolumbar fractures with spinal cord injury.METHODS One-hundred-and-twenty patients who received surgery for severe thoracolumbar fractures with spinal cord injury at our hospital from February 2018 to February 2020 were randomly enrolled.They were randomly divided into group 1(one-stage combined anterior-posterior surgery,n=60)and group 2(onestage anterior-approach surgery,n=60).Treatment efficacy was compared between the two groups.RESULTS Blood loss was greater and the operation time was longer in group 1 than in group 2,and the differences were statistically significant(P<0.05).Incision length,intraoperative X-rays,and length of hospital stay were not significantly different between the two groups(P>0.05).Preoperative function of the affected vertebrae was not significantly different between the two groups(P>0.05).In each group,the patients showed significant improvement after surgery.The anterior vertebral height ratio and the posterior vertebral height ratio in group 1 after surgery were significantly higher than those in group 2.The Cobb angle after surgery was significantly lower in group 1 than in group 2(P<0.05).The canal-occupying ratio of the affected vertebrae was not significantly different between the two groups(P>0.05).Before surgery,there was no significant difference in the quality of life scores between the two groups(P>0.05).The above indicators were significantly improved after surgery compared with before surgery in each group.In addition,these indicators were markedly better in group 1 than in group 2 after surgery(P<0.05 for each).CONCLUSION One-stage combined anterior-posterior surgery effectively improves the function of the affected vertebrae and the life quality of patients with severe thoracolumbar fractures and spinal cord injury.This surgical approach is worthy of popularization in clinical use.

Surgical treatment of metachronous rectal liver and lungmetastases： A combined videolaparoscopic andvideothoracoscopic approach

To the Editor：We read with tremendous interest the paper by Del Fabbroet al. [1]. In this thorough article, the authors meticulously underlinethe advantages of a modified j-shaped incision for the simultaneoustreatment of difficult liver colorectal metastases （CRM） and right-lung CRM, reporting their experience in a cohort of 11 patients.

Relaxed Stability Criteria for Time-Delay Systems:A Novel Quadratic Function Convex Approximation Approach

This paper develops a quadratic function convex approximation approach to deal with the negative definite problem of the quadratic function induced by stability analysis of linear systems with time-varying delays.By introducing two adjustable parameters and two free variables,a novel convex function greater than or equal to the quadratic function is constructed,regardless of the sign of the coefficient in the quadratic term.The developed lemma can also be degenerated into the existing quadratic function negative-determination(QFND)lemma and relaxed QFND lemma respectively,by setting two adjustable parameters and two free variables as some particular values.Moreover,for a linear system with time-varying delays,a relaxed stability criterion is established via our developed lemma,together with the quivalent reciprocal combination technique and the Bessel-Legendre inequality.As a result,the conservatism can be reduced via the proposed approach in the context of constructing Lyapunov-Krasovskii functionals for the stability analysis of linear time-varying delay systems.Finally,the superiority of our results is illustrated through three numerical examples.

Reply to： Surgical treatment of metachronous rectal liver andlung metastases： A combined videolaparoscopic and videothoracoscopic approach

The Author Reply：We thank Dr. Sucameli et al. for the interest toward our article[1] and for the opportunity for further discussing on this issue,providing a case report of single metastastic fore sites in the liverand lung both treated in a minimal access fashion. However, giventhe interest of the authors insight, it appears misleading when related to that discussed in our report which was clearly referred toother patients＇ profiles. Indeed, they described a case with a singleperipheral nodule in the right lung and a single liver metastasesin segment 5. This uncommon situation （less than 2% of patientsaccording to the LiverMetSurvey registry [2]）, is obviouslya more than reasonable indication for a mini-invasive approach.However, our patients received surgery for complex oncological involvementof the liver： as described, this means large and/or multiplelesions, in contact or invading the hepatic veins at caval confluence.For such conditions we have introduced original surgicalapproaches [3,4]： in such conditions we would select a J-shapedthoracophrenolaparotomy for the liver per se [5]. This incision forsuch complex conditions other than allowing the liver clearance in a single operation rather than in staged approach [6], allows justin case the removal of lung nodules. Therefore, we thank again theauthors for their interest to our report, and furthermore we congratulatefor the original management of the shared clinical case.However, the condition recalled by the authors is related to a scenariooncologically and surgically at the opposite side of that discussedin our paper and for that somehow suggesting a comparisonis misleading.

Combined hepatocellular-cholangiocarcinoma:An update on epidemiology,classification,diagnosis and management

Background:Combined hepatocellular-cholangiocarcinoma(CHC)is a rare subtype of primary hepatic malignancies,with variably reported incidence between 0.4%–14.2%of primary liver cancer cases.This study aimed to systematically review the epidemiological,clinicopathological,diagnostic and therapeutic data for this rare entity.Data sources:We reviewed the literature of diagnostic approach of CHC with special reference to its clinical,molecular and histopathological characteristics.Additional analysis of the recent literature in order to evaluate the results of surgical and systemic treatment of this entity has been accomplished.Results:The median age at CHC’s diagnosis appears to be between 50 and 75 years.Evaluation of tumor markers[alpha fetoprotein(AFP),carbohydrate antigen 19–9(CA19–9)and carcinoembryonic antigen(CEA)]along with imaging patterns provides better opportunities for CHC’s preoperative diagnosis.Reported clinicopathologic prognostic parameters possibly correlated with increased tumor recurrence and grimmer survival odds include advanced age,tumor size,nodal and distal metastases,vascular and regional organ invasion,multifocality,decreased capsule formation,stem-cell features verification and increased GGT as well as CA19–9 and CEA levels.In case of inoperable or recurrent disease,combinations of cholangiocarcinoma-directed systemic agents display superior results over sorafenib.Liver-directed methods,such as transarterial chemoembolization(TACE),percutaneous ethanol injection(PEI),hepatic arterial infusion chemotherapy(HAIC),radioembolization and ablative therapies,demonstrate inferior efficacy than in cases of hepatocellular carcinoma(HCC)due to CHC’s common hypovascularity.Conclusions:CHC demonstrates an overlapping clinical and biological pattern between its malignant ingredients.Natural history of the disease seems to be determined by the predominant tumor element.Gold standard for diagnosis is histology of surgical specimens.Regarding therapeutic interventions,major hepatectomy is acknowledged as the cornerstone of treatment whereas minor hepatectomy and liver transplantation may be applied in patients with advanced cirrhosis.Despite all therapeutic attempts,prognosis of CHC remains dismal.

“大思政课”建设的理论意涵和实践进路

“大思政课”建设是推进思想政治理论课高质量发展的重要举措。“大思政课”区别于“大思政”,其本质属性是课程属性,通过各种方式实现教学中的理论与实际相结合,以达成育人目标;实践教学并非是“大思政课”的唯一实现途径,课堂讲授中史论结合的头脑思辨、社会资源和力量参与课堂教学过程、借助现代信息技术的虚拟现实教学场景体验等,也应是“大思政课”建设的重要举措。因此,应在教学论视域下明确“大思政课”建设的目标、内容、方式、主体及评价内涵,并在把准实践逻辑的基础上明晰其主要进路。

前外联合后内侧入路手术治疗伴冠状面半脱位的Wahlquist C型内侧胫骨平台骨折的效果分析

目的探究前外联合后内侧入路手术方案治疗伴冠状面半脱位的Wahlquist C型内侧胫骨平台骨折(mTPF)患者的疗效。方法前瞻性选取2020年8月至2022年8月江阴市人民医院收治的69例伴冠状面半脱位的Wahlquist C型mTPF患者,按照信封法将其分为对照组(n=34)和研究组(n=35)。对照组接受单一后侧倒“L”形入路手术方案,研究组接受前外联合后内侧入路手术方案。随访12个月,比较组间临床指标(手术时间、切口长度、术中失血量、术后引流量及住院时间);术前、术后1、3、6、12个月的疼痛[视觉模拟评分法(VAS)评分]情况;术前及术后1、3、6、12个月的膝关节功能[美国特种外科医院(HSS)评分];术后即刻、术后12个月的影像学资料(内翻角、后倾角、活动度);术后12个月的生活质量情况[世界卫生组织生存质量测定简表(WHOQOL-BREF)评分],并于末次随访时评估疗效,记录并发症情况。结果两组间手术时间、切口长度、术中失血量、术后引流量、住院时间比较,差异均无统计学意义(P>0.05)。研究组术后1、3、6个月的VAS评分分别为(3.45±0.56)、(3.01±0.34)、(2.56±0.38)分,均低于对照组[(3.88±0.61)、(3.37±0.33)、(2.98±0.42)分],差异均有统计学意义(P<0.05);术前及术后12个月,组间VAS评分比较,差异均无统计学意义(P>0.05)。术前及术后1、3、6、12个月,两组间HSS评分比较,差异均无统计学意义(P>0.05)。术后12个月,研究组内翻角、后倾角分别为(85.11±4.32)°、(5.03±0.35)°,均低于对照组[(88.98±3.16)°、(6.11±0.36)°],活动度为(113.26±13.66)°,高于对照组[(106.56±12.06)°],差异均有统计学意义(P<0.05)。术后12个月,两组间WHOQOL-BREF评分比较,差异均无统计学意义(P>0.05)。两组治疗优良率比较,差异无统计学意义(P>0.05)。两组并发症发生率比较,差异无统计学意义(P>0.05)。结论采用前外联合后内侧入路手术方案治疗伴有冠状面半脱位的Wahlquist C型mTPF患者的疗效和安全性与单一后侧倒“L”形入路手术方案相当,但在术后影像学指标、疼痛程度方面有一定优势,临床应根据实际情况灵活选择。

考虑泄洪设施闸门控制的水库防洪调度

【目的】水库防洪调度在防汛工作中具有举足轻重的地位,而如何控制泄洪设施闸门是水库防洪调度方案实施的关键。为此,【方法】建立了考虑泄洪闸门调度的水库防洪优化调度模型以实现精细化调度,并提出一种两层嵌套算法对模型进行求解。在内层建立了包括所有泄洪闸门可行组合的泄洪闸门组合表,外层采用POA算法对水库坝前水位和总泄水量进行优化,并通过查询闸门组合表确定各泄洪闸门的运行状态。【结果】澜沧江漫湾水库防洪优化调度的实例分析结果表明:所提出的两层嵌套方法计算效率较高,对于100年一遇和10年一遇的洪水事件,洪峰分别从12010 m^(3)/s减少到10611 m^(3)/s和从5003 m^(3)/s减少到3351 m^(3)/s,分别减少了11.6%和33.0%,洪水波动幅度分别降低了94.5%和8.8%,极大地缓解了下游防洪压力。此外,与不考虑泄洪闸门调度的传统防洪调度模型相比,所提出的模型能生成更加符合实际、更易于执行的防洪调度方案。【结论】该方法能够实现水库防洪优化调度向泄洪设施运行控制的精细化转变,对于增强防洪优化调度成果的可操作性、提升水库防洪调度管理水平具有一定意义。

踝关节后外侧及内侧联合入路术式治疗踝骨骨折的临床效果分析

目的探究踝骨骨折患者应用踝关节后外侧及内侧联合入路术式治疗的作用。方法随机选取昆山市第四人民医院于2016年6月—2023年12月收治的60例踝骨骨折患者为研究对象。采用双色球法均分为研究组、参照组,各30例。参照组行单侧入路术式,研究组行后外侧及内侧联合入路术式。比较两组的围术期指标、踝关节功能及并发症发生情况。结果研究组术中出血量为(101.48±7.65)mL,高于参照组的(97.52±5.33)mL,差异有统计学意义(t=2.326,P<0.05)。两组手术时间、下床活动时间及住院时间比较,差异无统计学意义(P均>0.05)。研究组踝关节功能中疼痛、功能及活动度评分均高于参照组,差异有统计学意义(P均<0.05)。两组并发症发生情况比较,差异无统计学意义(P>0.05)。结论与单侧入路术式相比,后外侧及内侧联合入路术式能够改善踝骨骨折患者的围术期指标,提高骨代谢及踝关节功能,减少并发症发生情况。

以总体性把握和践行总体国家安全观

总体性是总体国家安全观的突出特征和理论本质,在逻辑上表现为总体国家安全观对“两个结合”的遵循,在理论上强调总体国家安全观的总体性优化,在实践中突出全局性主动的品格。具言之,总体国家安全观以唯物辩证法为理论底蕴,回应了国内外安全局势的现实且吸纳了中华优秀传统文化中的安全思想;对传统安全与非传统安全的论述丰富了国家安全的领域,对共同安全的关注提升了国家安全的国际视野和战略高度,对虚拟安全的重视使国家安全的场域空间更加全面完整;通过法治体系建设奠定总体性格局,通过坚持党的领导、完善国家安全教育制度主动应对风险与挑战。

尾侧中间联合入路在腹腔镜结肠癌完整结肠系膜切除术患者中的应用效果

目的:观察尾侧中间联合入路在腹腔镜结肠癌完整结肠系膜切除术患者中的应用效果。方法:回顾性分析2020年1月至2021年12月该院收治的60例右半结肠癌并不完全性肠梗阻患者的临床资料,根据手术入路不同将其分为对照组和研究组各30例。两组均行腹腔镜结肠癌完整结肠系膜切除术治疗,对照组采用头侧中间联合入路,研究组采用尾侧中间联合入路,两组术后均随访1年。比较两组手术相关指标(手术时间、术中出血量、排便时间、排气时间、术后住院时间)水平,手术前后应激指标[促肾上腺皮质激素(ACTH)、皮质醇(Cor)、去甲肾上腺素(NE)、肾上腺素(E)]水平、炎性指标[肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)、C反应蛋白(CRP)]水平、肿瘤标志物[癌胚抗原(CEA)、糖类抗原125(CA125)、糖类抗原19-9(CA19-9)]水平,并发症发生率和1年生存率。结果:研究组手术时间、排便时间、排气时间、术后住院时间均短于对照组,术中出血量少于对照组,差异有统计学意义(P<0.05);术后1 d,研究组ACTH、Cor、NE、E、CRP、TNF-α、IL-6水平均低于对照组,差异有统计学意义(P<0.05);术后3d,研究组CEA、CA125、CA19-9水平均低于对照组,差异有统计学意义(P<0.05);两组并发症发生率和1年生存率比较,差异均无统计学意义(P>0.05)。结论:尾侧中间联合入路应用于腹腔镜结肠癌完整结肠系膜切除术患者可改善手术相关指标水平,降低术后应激指标、炎性指标和肿瘤标志物水平,效果优于头侧中间联合入路。

基于信息量法的多模型对比分析石家庄西部山区滑坡易发性研究

石家庄市西部山区地质状况不良,气象方面常在雨季形成暴雨,因而地质灾害频发,其中滑坡灾害占比较重,因此针对石家庄市西部山区的滑坡灾害进行易发性分析有重要意义。现有单一模型在滑坡灾害易发性评价方面应用广泛,但仍有局限性。为提高对区域滑坡灾害易发性评价精准度,采用单一模型和复合模型等多模型对比分析研究区滑坡易发性,得到评价精度更好的评价模型。首先通过对研究区孕灾条件筛选出降雨量、坡度、高程、坡向、曲率、地质岩性、距水系距离、距断层距离、地震烈度、距道路距离、植被覆盖率和土地利用类型共12项评价因子。基于信息量法,用层次分析法、熵权法以及组合赋权法进行对比分析,最终得到易发性分区图,通过ROC曲线和灾害点密度验证其可靠性。结果表明,以上三种分析方法在ROC曲线中的AUC值分别为0.732、0.749、0.766,三种模型评价结果都有一定的可靠性,其中组合赋权法模型精度更高,可靠性更好,确定采用组合赋权模型。

基于国外某矿厂码头的结构方案研究

在某矿厂码头工程设计中,利用矿厂采矿废石料回填造陆价格低廉的优势,提出了高桩梁板式结构、钢管板桩组合结构、钢管排桩结构方案并开展分析研究。在高桩梁板式方案中,为减少前方承台与后方陆域距离,采用了一种可以适应较大水深卸荷承台式接岸结构。钢管板桩组合结构和钢管排桩结构虽然均为板桩结构,但相对于钢板桩,钢管桩单桩水上可打性更好,因此分别对其采用了填筑施工围堰的陆上打桩施工方式和打桩船打桩的水上打桩施工方式。最终通过综合技术经济比选,选定了适用于本工程的最优结构方案,为提高钢排桩板桩结构的应用前景提供经验。

单纯后路病灶清除颗粒植骨内固定与后前路联合治疗腰椎结核的疗效比较

目的探讨单纯后路病灶清除颗粒植骨内固定术治疗腰椎结核的疗效及安全性。方法回顾性分析河北省胸科医院2020年5月—2022年8月接受腰椎结核后路及后前路手术的患者42例,根据手术方式分为单纯后路组24例和后前路组18例。比较2组患者手术时间、术中出血量及术后卧床时间;检测ESR、CRP等炎性指标的变化;使用疼痛视觉模拟评分(VAS)和Oswestry功能障碍指数(ODI)评估腰部疼痛及功能恢复情况;测量术后Cobb角矫正度数与随访1年丢失度数,记录术后融合时间;应用Bridwell植骨融合标准及CT骨融合标准评估植骨融合情况。结果与后前路组比较,单纯后路组手术时间缩短(t/P=5.995/<0.001),术中出血量减少(t/P=2.134/0.039),术后卧床时间缩短(t/P=5.835/<0.001)。与术前比较,2组患者术后6个月ESR、CRP降低,差异均有统计学意义(P<0.01);随访1年VAS、ODI评分均降低,差异有显著统计学意义(P<0.01),而2组之间比较差异无统计学意义(P>0.05)。2组患者术后Cobb角纠正度数、术后1年丢失度数及术后融合时间比较差异无统计学意义(P>0.05)。根据Bridwell融合标准和CT骨融合标准,2组随访1年的植骨融合比较,差异无明显统计学意义(P>0.05)。结论单纯后路与后前路联合手术治疗腰椎结核均可获得满意疗效。单纯后路病灶清除颗粒植骨内固定手术治疗腰椎结核取得了良好的临床疗效且安全可行,具有手术时间短、出血少、创伤小的优点。

腰腹联合入路机器人辅助马蹄肾右肾部分切除术1例报告(“大家泌尿网”观看手术视频)

目的探讨腰腹联合入路机器人辅助马蹄肾(HSK)右肾部分切除术治疗HSK合并肾肿瘤的可行性与安全性。方法报道安徽医科大学第一附属医院收治的1例HSK合并肾肿瘤的患者的临床及随访资料。本例患者的治疗创新性采用腰腹联合入路机器人辅助HSK右肾部分切除术,术前经肾脏计算机断层扫描平扫、增强+血管成像明确诊断及血供,术后随访。结果手术顺利完成,手术时间为270 min。术中热缺血时间30 min,术中出血约300 mL,术中及术后无并发症出现。术后2个月随访,患者恢复良好,未见胸腹部淋巴结肿大及肺部转移灶。结论腰腹联合入路机器人辅助HSK肾部分切除术是治疗HSK合并肾肿瘤安全可行的微创治疗方案。

文化外译与传播研究路径探索——“中华文化翻译与国际传播”高端研讨会述评

近年来,国内的中华文化译介与传播研究趋热,成果较丰富,但有待加强和推进。对近期举行的一次全国性专题研讨会上的重要论文进行述评,由此管窥、分析本领域研究最新进展和存在的不足,发现当前研究聚焦于理论建构、中华典籍和中国文学经典的翻译与传播、受众接受等,但研究取向上存在三个突出问题,即普遍重翻译,轻传播;重传播结果,轻传播过程;讨论传播效果却缺乏可靠的接受研究。进而探讨社会学、传播学和综合路径应用于本领域研究的潜力,指出社会学路径和传播学路径较为成熟,但拓展和改进的空间还很大,综合路径尚有待探索,有望取得重要突破。

强震区含空洞高速铁路隧道刚柔相济减震效果研究

为提高强震区含空洞铁路隧道衬砌的安全性,采用检查车对19座高铁隧道背后空洞进行测试,借助数值模拟研究刚柔相济措施在强震区含空洞隧道的应用效果。研究结果表明:高铁隧道素混凝土区段空洞最易出现在拱顶,频率为0.82;含空洞高铁隧道采用柔性减震措施时,安全系数提高34.49%~39.36%;采用刚性抗震措施时,安全系数提高20.34%~32.66%;采用刚柔相济措施时,安全系数提高35.65%~51.15%;综合位移、地震动峰值加速度、结构内力,刚柔相济措施在强震区含空洞高铁隧道的应用效果最优。研究结果可为强震区含病害高铁隧道抗震设防提供参考。