Absolute Wall Thickness Measurement of Conducting Plates Using Pulsed Eddy Currents

The method using pulsed eddy currents to determine the thickness of a conduction plate is extended to enable the simultaneous measurement of the plate thickness and material properties. For optimal performance, a probe must be designed depending on the thickness range that should be accessible. The need for a calibration of the material properties of a conducting plate to enable the measurement of its thickness has been removed. All that is needed is a probe with known dimensions and suitable hardware to create a current pulse and measure a transient magnetic induction.

Theory of Flexural Shear, Bending and Torsion for a Thin-Walled Beam of Open Section

Aspects of the general Vlasov theory are examined separately as applied to a thin-walled channel section cantilever beam under free-end end loading. In particular, the flexural bending and shear that arise under transverse shear and axial torsional loading are each considered theoretically. These analyses involve the location of the shear centre at which transverse shear forces when applied do not produce torsion. This centre, when taken to be coincident with the centre of twist implies an equivalent reciprocal behaviour. That is, an axial torsion applied concentric with the shear centre will twist but not bend the beam. The respective bending and shear stress conversions are derived for each action applied to three aluminium alloy extruded channel sections mounted as cantilevers with a horizontal principal axis of symmetry. Bending and shear are considered more generally for other thin-walled sections when the transverse loading axes at the shear centre are not parallel to the section = s centroidal axes of principal second moments of area. The fixing at one end of the cantilever modifies the St Venant free angular twist and the free warping displacement. It is shown from the Wagner-Kappus torsion theory how the end constrained warping generates an axial stress distribution that varies with the length and across the cross-section for an axial torsion applied to the shear centre. It should be mentioned here for wider applications and validation of the Vlasov theory that attendant papers are to consider in detail bending and torsional loadings applied to other axes through each of the centroid and the web centre. Therein, both bending and twisting arise from transverse shear and axial torsion applied to each position being displaced from the shear centre. Here, the influence of the axis position upon the net axial and shear stress distributions is to be established. That is, the net axial stress from axial torsional loading is identified with the sum of axial stress due to bending and axial stress arising from constrained warping displacements at the fixing. The net shear stress distribution overlays the distributions from axial torsion and that from flexural shear under transverse loading. Both arise when transverse forces are displaced from the shear centre.

适应锅炉调峰运行的水冷壁高温腐蚀预测模型

随着可再生能源大规模并网,传统火电机组作为调配能源的地位显著增强,这对锅炉灵活调峰运行的安全稳定性提出了更高要求。本文耦合烟气侧与工质侧传热,结合管壁温计算,形成水冷壁壁温分布耦合计算方法。同时,建立了用于确定还原性气氛下的燃料硫释放以及含硫组分的相互转化过程的SO_(x)生成模型。综合炉膛数值模拟、水冷壁壁温耦合计算以及包含时间维度的管壁高温腐蚀模型,提出了一种适应锅炉调峰运行的水冷壁高温腐蚀预测模型并基于Matlab GUI开发了对应软件。选取一台超临界600MW四角切圆燃煤锅炉为研究对象,结果表明:采用壁温耦合计算模型和SO_(x)生成模型得到水冷壁的壁温分布和近壁面H_(2)S浓度分布准确度高,为水冷壁高温腐蚀的准确预测提供了良好基础。不同负荷下水冷壁高温腐蚀特征存在差异,壁面腐蚀程度整体上随负荷降低而降低。100%BMCR与75%THA负荷下前墙水冷壁燃烧器与SOFA之间的区域腐蚀最为严重,最大年腐蚀深度分别为276μm和233μm;50%THA与35%BMCR负荷下高温腐蚀深度在燃烧器区域的上部迅速增加至最大值,分别为224μm和256μm。多工况运行水冷壁高温腐蚀状态表现为各工况腐蚀状态的时空叠加。运用水冷壁高温腐蚀预测模型可实现通过锅炉运行参数和运行时间预测多工况下水冷壁高温腐蚀状态程度的时空分布。

装配式混凝土剪力墙结构接缝连接研究进展

装配式剪力墙结构拼装时存在大量的水平接缝和竖向接缝,由于剪力墙的刚度较大,接缝连接处易存在刚度不足引起的损伤集聚问题,成为影响结构整体性和抗震性能的决定性因素。总结了国内外正在发展的预制装配式剪力墙结构水平和竖向接缝的连接形式,并对各类连接形式的构造特点、抗震性能、应用优势和技术瓶颈进行了系统阐述和分析,在此基础上探讨了装配式剪力墙结构接缝连接技术的发展方向。结果表明:目前湿式连接技术已较为成熟且被广泛应用,但仍存在现场湿作业量大、质量不易检测和控制等问题;干式连接技术工业化程度高,但对施工精度的要求也高,可能产生的螺栓松动、锈蚀以及磨损问题限制了其工程应用;将消能减震技术融入竖向接缝连接,利用超高性能混凝土实现水平接缝连接,并结合可恢复功能防震技术,是未来装配式剪力墙结构高质量发展的新增长点。

嵌套加强的LQ550高强冷弯薄壁C型钢连续檩条受力性能研究

为提高LQ550级高强冷弯薄壁C型钢连续檩条的承载能力,采用在支座处嵌套的方法来加强连续檩条。对未加强和采用两种嵌套方式加强的檩条共7组试件进行三点受弯试验,得到了试件的承载性能和破坏形态,试验结果表明加强后的试件出现跨中局部屈曲和嵌套端部局部屈曲两种破坏形态。采用ABAQUS软件建立了非线性有限元模型对嵌套加强的檩条进行数值模拟,有限元分析得到的承载力和破坏形态与试验结果吻合良好,验证了有限元模型的准确性。基于验证的有限元模型,分析了两种嵌套方式和不同嵌套长度对檩条承载力的提升,且表明嵌套檩条的长度宜取为连续檩条跨度的1/5~1/4。

Impact of Right Ventricular Dysfunction in Morbidity and Mortality in Patients with Inferior Wall Myocardial Infarction Presenting to a Tertiary Care Center of Nepal

Introduction: In comparison to anterior wall myocardial infarction, inferior wall myocardial infarction is generally regarded as a low risk event. The aim of this study was to evaluate the prognostic impact of right ventricular (RV) myocardial involvement in patients with inferior wall myocardial infarction (IWMI). Methods: This is an observational study of 82 consecutive IWMI patients admitted and treated in Manmohan Cardiothoracic, Vascular and Transplant Center (MCVTC) from May 15 2018 to June 15 2019. The clinical characteristics, risk factors profile, electrocardiographic, echocardiographic, including RV function and angiographic characteristics, complications and in-hospital deaths were analyzed. Results: The mean age of patients presenting with IMWI was 64.8 ± 13.8 years with predominance of male (67%). Right ventricular myocardial infarction was present in 34.1% of patient with RV dysfunction in 25.6% patients. Mean Tricuspid Annular Plane Systolic Excursion (TAPSE), RV tricuspid annulus (S') and RV Fractional area change (FAC) in patients with RV dysfunction vs patients without RV dysfunction were 12.2 ± 3.3 mm vs 22.5 ± 3.5 mm (p < 0.001), 7.54 ± 0.91 cm/s vs. 12.79 ± 2.16 cm/s respectively (p Conclusion: In inferior wall myocardial infarction, RV involvement with RV dysfunction is an independent risk factor for in-hospital mortality along with advanced age, complete atrioventricular block, higher Killip class, delayed hospital presentation, left ventricular ejection fraction < 40% and angiographic evidence of triple vessel disease.

Recent Vegetation Cover Dynamics and Climatic Parameters Evolution Study in the Great Green Wall of Senegal

The drought recorded in 1970s and 1980s, particularly in the Sahara and Sahel region has greatly affected the population as well as the economies and the eco-systems of this area. In 2007, the African Union launched a Pan-African program, the Great Green Wall for the Sahara, the Sahel Initiative (GGWSSI) to reverse land degradation and desertification by planting a wall of trees stretching from Dakar to Djibouti. The objective is to improve food security, and support local people to adapt to climate change. This paper aims to evaluate the impacts of the reforestation program in Senegal, fifteen years after it was launched. This study uses a time series of satellite-derived vegetation cover and climatic parameters data to analyze the sustainability of these interventions. Change detection approaches were applied to identify and characterize the drives of the eventual changes. A comparative analysis of reforestation on climatic parameters was explored through the temporal analysis of the vegetation index over the periods 2000-2008 and 2009-2020. An increase in vegetation activity was noted through the NDVI at the interannual (+2% to +8%) and seasonal (+1.5% to 7% for the wet season and 1% to 4% for the dry season) scale and a positive and significant evolution is noted on the trace of the GGW. Also, the period 2009-2020 recorded an increase in rainfall of 2% to 8% of the average value 2000-2020 and 4% to 8% of the rainy season. Soil moisture is the climatic parameter that has increased the most, with an increase of 25% to 54% of the 2000-2020 average, i.e. between 20 mm and 70 mm more. This study shows a significant improvement in the relationship between NDVI and climate parameters after the different reforestation actions of the GGW.

果实采后软化机制研究进展

采后果实在经过储藏运输等一系列过程后会发生软化现象,而软化现象产生的原因有很多,例如由于细胞壁代谢相关酶活性的作用,使得细胞壁的物质成分、结构等发生改变;也可能是由于果实成熟后相关物质的变化以及受到植物激素的调控,进而促进果实成熟软化。本文综述了采后果实软化产生的原因,包括植物激素合成以及与受体结合进而促进果实软化、相关转录因子对果实软化的调控和果实软化相关的细胞壁代谢与碳水化合物代谢等途径,以期为探究采后果实软化机制提供参考。

模块化冷弯薄壁型钢结构体系低层村镇住宅设计研究

在传统冷弯薄壁型钢结构体系的基础上,从模块化、装配化角度出发,提出了一种适用于低层村镇住宅的新型结构体系——模块化冷弯薄壁型钢结构体系。首先,简述了墙体模块单元的构成,给出了7种通用标准化墙体模块单元,并介绍了基于通用标准化模块单元的村镇模块化户型构建原则及过程;其次,详述了便于快速装配安装的标准墙体单元间模块化连接方式,对模块连接节点进行了受力分析及数值模拟,并给出了模块化冷弯薄壁型钢结构体系构建的原则;最后,重点介绍了适用于所有冷弯薄壁型钢结构体系的抗剪墙长简化设计方法以及基于模块化冷弯薄壁结构体系的抗剪墙长设计方法,并通过实际案例详述了墙长确定过程,同时对比了不同计算方法的抗剪墙长,进一步验证了所提出的抗剪墙长简化设计方法的可行性。结果表明:所提出的模块化冷弯薄壁型钢结构体系可大幅提高冷弯薄壁型钢结构低层村镇住宅的工业化和产品化水平,大幅缩减了工期;所提出的抗剪墙长简化设计方法可显著降低设计门槛,便于该类体系的推广应用。

钢幕墙“POSN STEEL WALL”结构性能试验及评价

玻璃装饰外墙的幕墙具有外观华丽、施工维护方便等优点,目前得到了广泛应用。作为幕墙外墙的玻璃框架,主要采用重量轻、加工方便的铝材制作。韩国钢制幕墙(POSN STEEL WALL)由高耐腐蚀性合金镀层钢板制作而成,具有优异的结构性能,可承受压缩、拉伸和弯曲载荷,无需加固即可安装,且其强度大于铝材,可用于薄型框架制作。通过开展全尺寸钢幕墙POSN STEEL WALL的结构性能试验,并将试验结果应用于实际项目,分析其施工性能。

A Sandwich Technique Employing Right Ventricular Incision to Repair Posterior Ventricular Septal Rupture with Right Ventricular Wall Dissection: A Case Report

Background: Ventricular septal rupture (VSR) leading to right ventricular (RV) wall dissection is an extremely rare and life-threatening complication of inferior myocardial infarction (MI) with posterior VSR. Its rare incidence and complex pathology make it difficult to select the appropriate surgical procedures to prevent fatalities. Case Presentation: A 68-year-old woman was transferred to our hospital because of a post-infarction VSR 12 days after symptom onset. Short-axis image obtained using transthoracic echocardiography demonstrated a large posterior VSR. Moreover, the VSR was continuous, with a large echo-free space in the posterior wall of the right ventricle. Color echocardiography showed blood flowing into the echo-free space through the septal defect and blood flowing out into the RV lumen. Coronary angiography revealed complete occlusion of the second segment of the right coronary artery. Thus, dissection of the posterior wall of the right ventricle that continued into the RV lumen was considered to have been caused by the posterior VSR caused by an inferior MI. The patient underwent urgent surgery to repair the VSR using the sandwich double-patch technique by making a posterior RV incision that was repaired using a third patch. No additional procedure was required to block the flow from the cavity of the RV wall dissection into the RV lumen. Postoperative echocardiography and contrast-enhanced computed tomography demonstrated that the VSR was closed securely and the RV wall dissection was almost completely thrombosed. Conclusion: In this case, a patient with a posterior VSR and RV wall dissection was successfully treated using the sandwich double-patch technique with a posterior RV incision. No additional procedure may be needed for RV wall dissection when a secure VSR repair is complete;however, close follow-up is essential to improve the long-term prognosis.

Estimation of the Carbon Sequestration Dynamics of Senegal’s Great Green Wall Based on Land Cover over the Past Three Decades

The severe drought observed in the Sahel during 1970s, 1980s and 1990s has deeply affected the population as well as the economies and the eco-systems of this climatic area. The GGW Initiative spearheaded by Africa Union in 2007 proposed to combat the land degradation and desertification by planting a wall of trees stretching from Dakar to Djibouti. A reforestation was then conducted in the Senegal’s GGW since 2006 as part as other areas in the Sahel. This paper aims to evaluate the carbon sequestration dynamics in the sites of the Senegal’s GGW over the last three decades. The method consists firstly of analyzing the evolution of land cover and land use dynamics based on ESA-CCI LC satellite data. There is an improvement of the surface areas of tree and shrub savanna of 11.40% (Tessekere), 8.25% (Syer) and 2.70% (Loughere-Thioly). The regreening of the different localities and a positive dynamic observed is explained by the return to normal rainfall and to reforestation actions, agroforestry practices, better management of natural resources undertaken. However, some non-reforested sites showed an opposite trend despite of the normal rainfall. Secondly, the results on land mapping are used as a proxy for the assessment of carbon stocks. The dynamic observed in vegetation cover since the beginning of the reforestation made it possible to sequester 5.8 million tons of carbon representing respectively 2.31% of African GGW. This gain in stored carbon is equivalent to 21.2 million tons of CO2 captured in the atmosphere. Through this study, it appears that carbon storage becomes significant 8 to 10 years after the start of reforestation. An urbanization without respect for the environmental factors could be a danger for the climate (case of Ballou).

基于HR-MRI分析MCAS患者血管管壁特征与卒中的关系

目的基于三维高分辨率磁共振(HR-MRI)分析大脑中动脉粥样硬化性狭窄(MCAS)患者血管管壁特征与卒中的关系。方法回顾性分析2020年4月~2023年4月我院收治的100例MCAS患者临床资料,根据病变血管是否引发卒中情况,将其分为责任血管组(引发卒中的大脑中动脉,n=100)和非责任血管组(对侧未引发卒中的大脑中动脉,n=77),比较两组大脑中动脉斑块分布情况、斑块类型、斑块强化类型、斑块强化程度及管壁参数。结果100例MCAS患者中共发现227个斑块,其中责任血管组中有106个,非责任血管组中有121个;两组均以前壁斑块最为常见,但责任血管组上壁斑块所占比例(26.42%)明显高于非责任血管组(14.88%)(P<0.05)。责任血管组不规则斑块所占比例(63.21%)明显高于非责任血管组(43.80%)(P<0.05)。责任血管组偏心性强化斑块及高度强化斑块所占比例(84.91%、53.77%)明显高于非责任血管组(30.58%、8.26%),无强化和轻度强化斑块所占比例(7.55%、17.92%)明显低于非责任血管组(16.53%、43.80%),差异均有统计学意义(P<0.05)。责任血管组管腔狭窄程度、最大管壁厚度、管壁面积及斑块负荷均明显大于非责任血管组(P<0.05)。结论HR-MRI可清晰显示MCAS患者血管管壁特征,有助于评估斑块稳定性和识别责任血管,对预防卒中的发生具有一定参考价值。

Surgical Outcomes Following Partial Breast Reconstruction with Chest Wall Perforator Flaps

Introduction: In the last two decades, chest wall perforator flaps (CWPF) have become a versatile tissue replacement technique for partial breast reconstruction following breast-conserving surgery (BCS) in well-selected cases. We present the surgical outcome of 81 patients with chest wall perforator flaps used for breast-conserving surgery. Methods: We recorded the outcomes of three oncoplastic breast surgeons who performed partial breast reconstruction with chest wall perforator flaps from 1st January 2018 to 30th June 2022 at Sherwood Forest Hospitals NHS Foundation Trust. Data were collected on patient demographics, including age, BMI, smoking status, bra size, previous treatments, type of CWPF procedure, tumor size (measured clinically, via imaging and histologically), biopsy results, specimen weight, margins involvement, re-operation rate, surgical site infection (SSI), flap loss, flap shrinkage, hematoma, and seroma rates. Results: A total of 81 patients were included in this study, with an average age of 55.7 years and a body mass index (BMI) of 26.7 kg/m2. The bra size varied between A to FF with A (7.4%), B (28.3%), C (38.2%), D (13.6%), DD (11.1%), and FF (1.2%). 14.8% of the patients had neoadjuvant chemotherapy (NACT). For 45 patients, LICAP (lateral intercostal artery perforator), 16 AICAP (anterior intercostal artery perforator), 13 MICAP (medial intercostal artery perforator), and for seven patients, LTAP (lateral thoracic artery perforator) flaps were used. The average tumor was measured at 15.75 mm clinically, 19.1 mm via imaging, and 19.6 mm histologically. Biopsy showed that 16% of the tumors were ductal carcinoma in situ (DCIS), and 84% were invasive. 16% of patients had involved margins, and re-excision was required in 10 patients, and completion mastectomy was performed in 2 patients. A thirty-day SSI rate was 6.2%, with flap-related complications, including flap loss and shrinkage, at 3.7% and 4.9%, respectively. In addition, 3.7% had a hematoma, and 17.3% had other complications. Conclusion: Partial breast reconstruction with perforator flaps is an excellent volume replacement technique in breast-conserving surgery with acceptable complications in well-selected cases.

果香香韵单体在壁式加热卷烟中转移行为分析研究

为量化表征果香单体香原料在壁式加热卷烟中的调香可用性,基于气相色谱质谱联用技术和嗅觉感官阈值测定,分别研究了果香单体香料在壁式加热卷烟中的转移分布、加香贡献度及逐口释放行为。通过研究发现:1)果香单体香原料的加香贡献度D值差距甚大,其中D值最大的γ-辛内酯(12485.0)是苯甲醇(0.1)的10万倍;2)果香单体香料的主流烟气转移率不高,约7%~37%,但高沸点香料损失主要原因是冷凝截留而低沸点香料损失主要原因是抽吸过程中空气散失;3)果香单体香料的逐口释放量随抽吸口序增加有两种趋势,一种呈逐口递减趋势,另一种呈先增后递减趋势。其中庚酸乙酯,辛酸乙酯,癸酸乙酯,乙酰丙酸乙酯和苯乙酸乙酯属递减,肉桂酸乙酯,γ-庚内酯,γ-辛内酯,γ-癸内酯等属先增后减。

基于等值面体的三维涡旋数量与形状特征研究

涡旋是湍流的基本结构,被誉为流体运动的肌腱,涡旋研究对自然探索和工程应用有重要的意义.基于直接数值模拟的槽道湍流数据与旋转强度涡旋识别方法,以涡旋三维结构等值面体(以三角网格为单位)为研究对象,通过设置三角形切面,利用两三角形相交快速检测算法提取涡旋多边形,研究不同等值面体阈值及壁面距离条件下,涡旋数量与形状特征(圆度、半径、凸状及纵横比因子)的变化规律.以对数区内涡旋为例:随着阈值的增加,涡旋密度呈对数律快速递减,圆度和半径因子概率密度函数(PDF)变高耸,圆度均值快速递增后保持不变而半径均值不断递减,纵横比因子PDF未显著改变且均值基本不变,凸状因子PDF向脉冲函数靠近,说明阈值增大导致涡旋逐渐变少、变圆、变小并更饱满.在同一阈值下,随着壁面距离的增加,涡旋密度在外区(除靠近水面区域外)也呈对数律递减,圆度、纵横比及凸状因子先快速增加随后不变或缓慢增长,半径因子快速递减后保持不变,说明涡旋在远离壁面的过程中在不断破灭但形态却较为稳定.

自体腘绳肌腱植入手术治疗重度阴道前壁脱垂的中期疗效

目的探讨自体腘绳肌腱植入治疗重度阴道前壁脱垂的安全性和中期疗效。方法本研究为单臂临床试验,2021年5月开始纳入有症状、要求手术治疗的以阴道前壁重度脱垂为主的盆腔器官脱垂(pelvic organ prolapse,POP)患者,经患者充分知情,自愿选择自体腘绳肌腱添加修补,同时行双侧高位骶韧带悬吊。术后随访盆腔器官脱垂定量分度(pelvic organ prolapse quantification,POP-Q)、盆底不适调查表简表评分(Pelvic Floor Distress Inventory-Short Form 20,PFDI-20)、术后满意度评分、患者整体印象改善评分(Patient Global Impression of Improvement,PGI-I)。观察术后取腱侧下肢功能及术后并发症处理、再手术情况。结果取腱手术时间(19.7±8.3)min,盆底手术时间(122.1±37.8)min,术中出血量中位数70 ml(50~400 ml),无术中副损伤和术后病率。12例随访(26.4±2.5)月。Aa、Ba、C术前分别为3(-1~3)、5(2~10)、4(-1~10),术后24个月分别为-3(-3~3)、-3(-3~3)、-6(-6~3),差异有显著性(P<0.05)。12例术前、术后24个月PFDI-20评分分别为88.0(16.7~204.2)、8.3(0~32.3)分,差异有显著性(Z=-2.803,P=0.005);PGI-I问卷11例术后症状明显改善,1例有改善。术后6、24个月满意度评分分别为(4.8±0.4)分和(4.6±0.7)分。1例术后12个月自感阴道脱出物,阴道前壁及顶端脱垂Ⅲ度,复发率8.3%(1/12)。2例分别术后9 d、2周肺栓塞,Clavien-Dindo外科手术并发症分级分别为Ⅱ、Ⅲ级,分别门诊和住院治疗后痊愈。1例阴道顶端局部筋膜暴露,药物治疗好转。所有患者取腱部位切口愈合良好,肌力、下肢活动均正常。无因复发和筋膜条并发症再次手术。结论自体腘绳肌腱植入治疗重度阴道前壁脱垂手术安全,中期疗效满意。术前需向患者宣教下肢锻炼预防静脉血栓并发症。

基于旋量理论的镜像加工运动学建模及轨迹自动修调研究

针对镜像加工过程中结构变形致使加工精度难以控制的问题,建立了基于旋量理论的镜像加工剩余壁厚运动学模型,综合考虑零件加工要求及镜像约束关系,提出了镜像加工“支撑-铣削”轨迹生成方法,建立了针对工件变形补偿的镜像支撑轨迹修调模型,实现了镜像加工“支撑-铣削”轨迹自动修调。栅格壁板镜像加工验证试验结果表明,提出的镜像加工“支撑-铣削”轨迹生成和自动修调方法可以满足镜像加工剩余壁厚要求。

联肢弯剪型钢板剪力墙抗震性能试验研究

联肢钢板剪力墙结构是将2片钢板剪力墙通过钢连梁连接形成的抗侧力结构。通过对1榀1/3缩尺的4层联肢弯剪型钢板剪力墙试件进行低周往复加载试验,从滞回曲线、骨架曲线、延性、承载力及刚度退化、耗能能力等方面研究了该结构体系的抗震性能,并且对试件的屈服顺序和变形模式进行了分析。结果表明:联肢钢板剪力墙试件的延性系数达到5.03,承载力退化系数均大于0.96,承载力和刚度退化稳定,等效黏滞阻尼系数达到0.25以上,表明联肢弯剪型钢板剪力墙具有优越的抗震性能。加载过程中,连梁先于墙板发生屈服,墙板先屈曲后屈服,此后柱脚和横梁相继屈服。连梁的引入改变了结构的屈服机制,提高了整体的延性和耗能能力,能够组成多道抗震防线,且试件整体最终也体现出合理的破坏机制。整体侧移曲线呈弯剪变形模式。该试验研究更加贴合实际工程中联肢钢板剪力墙结构的应用情况,为联肢钢板剪力墙结构的进一步研究和应用提供了试验基础。

深厚覆盖层上土石坝防渗墙损伤开裂精细化分析及防渗功能评价

混凝土防渗墙是覆盖层上土石坝坝基的关键防渗结构,由于防渗墙与覆盖层的刚度和尺度差异巨大,通常的数值分析方法难以保证精度,且现有基于强度的安全评价方法,无法适应防渗墙作为防渗结构而非承载结构的功能评价要求。本文提出了比例边界元-有限元耦合跨尺度离散、塑性损伤模型和内聚力模型分离描述压损伤和受拉开裂、破损后防渗功能目标评价的精细化分析方法,实现了深厚覆盖层上土石坝防渗墙的性态演化评价。研究结果表明:超深覆盖层上悬挂式防渗墙在两岸底部因近似垂直于岸坡的高压应力发生压损伤,类“外伸梁”的面内弯曲变形使靠近防渗墙两岸的顶部和底部区域产生坝轴向高拉应力导致槽段间出现竖向裂缝;在防渗墙两岸的上游侧局部设置辅助防渗措施,可有效降低防渗墙破损后的渗流量。本文方法揭示了混凝土防渗墙的损伤开裂模式,定位了防渗墙薄弱区域,评价了防渗墙损伤开裂对防渗功能的影响,量化防渗措施效果,实现了防渗墙从传统承载能力评价到功能性态评价的跨越,可为深厚覆盖层上土石坝防渗墙的安全评价和设计优化提供理论和技术支持。