Rising utilization of stable isotopes in tree rings for climate change and forest ecology

Analyses of stable isotopes(C,O,H)in tree rings are increasingly important cross-disciplinary programs.The rapid development in this field documented in an increasing number of publications requires a comprehensive review.This study includes a bibliometric analysis-based review to better understand research trends in tree ring stable isotope research.Overall,1475 publications were selected from the Web of Science Core Collection for 1974-2023.The findings are that:(1)numbers of annual publications and citations increased since 1974.From 1974 to 1980,there were around two relevant publications per year.However,from 2020 to 2022,this rose sharply to 109 publications per year.Likewise,average article citations were less than four per year before 1990,but were around four per article per year after 2000;(2)the major subjects using tree ring stable isotopes include forestry,geosciences,and environmental sciences,contributing to 42.5%of the total during 1974-2023;(3)the top three most productive institutions are the Chinese Academy of Sciences(423),the Swiss Federal Institute for Forest,Snow and Landscape Research(227),and the University of Arizona(204).These achievements result from strong collaborations;(4)review papers,for example,(Dawson et al.,Annu Rev Ecol Syst 33:507-559,2002)and(McCarroll and Loader,Quat Sci Rev 23:771-801,2004),are among the most cited,with more than 1000 citations;(5)tree ring stable isotope studies mainly focus on climatology and ecology,with atmospheric CO_(2) one of the most popular topics.Since 2010,precipitation and drought have received increasing attention.Based on this analysis,the research stages,key findings,debated issues,limitations and direc-tions for future research are summarized.This study serves as an important attempt to understand the progress on the use of stable isotopes in tree rings,providing scientific guid-ance for young researchers in this field.

Effectivity and safety of trifocal intraocular lenses and capsular tension rings implantation for cataract patients with axial high myopia

●AIM:To assess effectivity and safety of trifocal intraocular lenses(IOLs)and capsular tension rings in treating cataract patients with axial high myopia.●METHODS:A prospective nonrandomized controlled clinical trial was conducted.Totally 98 eyes(74 patients)who underwent femtosecond laser-assisted cataract surgery(FLACS)with trifocal IOLs were enrolled in the study and followed up for 2y after surgery:46 eyes(33 patients)with capsular tension ring implantation in the long axial lengths(AL)group(26<AL<29 mm)and 52 eyes(41 patients)in the normal AL group(22<AL<24.5 mm).Postoperative outcomes about effectivity and safety,including the subjective and objective visual quality,and postoperative complications were assessed.●RESULTS:Uncorrected distance visual acuity at 5 m and uncorrected intermediate visual acuity at 60 and 80 cm in the long AL group were significantly worse than those in the normal AL group at 3mo postoperatively(P<0.05).The differences in reading speed,spectacle independence and potential visual complaints between the two groups were not statistically significant(P>0.05).The dysfunctional lens index and total modulation transfer function(MTF)average height were similar between the two groups.The postoperative internal coma aberrations in the axial high myopia eyes were significantly higher than that in the normal AL group(P<0.05).The total satisfaction score in the long AL group(91.32±2.76)was slightly higher than that in the normal AL group(90.36±3.47),but there was no difference(P=0.136).A statistically negative correlation was found between corrected distance visual acuity(CDVA)and dysfunctional lens index(r=-0.382,P=0.009),and between CDVA and the total MTF average height(r=-0.374,P=0.01).But there was no significant correlation between CDVA and total satisfaction score(r=0.059,P=0.696).Postoperative complications mainly presented as posterior capsular opacity(PCO),retinal detachment and cystoid macular edema.There was no difference in the incidence of fundus disease(6.5%vs 3.8%,P=0.663)or PCO(17.4%vs 7.7%,P=0.217)between the two groups at two years.●CONCLUSION:The utilization of trifocal IOL and capsular tension ring implantation is beneficial for cataract patients with axial high myopia undergoing FLACS.This approach not only ensures excellent subjective feelings and objective visual quality,but also does not increase the incidence of postoperative complications.

Stability of neodymium:YAG laser posterior capsulotomy in eyes with capsular tension rings

·AIM: To evaluate the stability of neodymium(Nd):YAG laser posterior capsulotomy in eyes with capsular tension rings(CTRs).·METHODS: A total of 60 eyes that underwent cataract surgery and laser posterior capsulotomy postoperatively were included in this retrospective cohort study. To evaluate the safety and stability of capsulotomy, changes in the size of posterior capsulotomy and anterior chamber depth(ACD) in three groups: the group without CTR, the group with 12 mm CTRs, and the group with 13 mm CTRs, at 1wk, 3, 12, and 15mo after capsulotomy, were compared. ·RESULTS: In the group without CTR and the group with 12 mm CTR, there was no significant change in ACD at every post-laser follow-up. In the group with 13 mm CTR, the ACD change was significant until 3mo after capsulotomy. In all groups, there was a significant increase in the area of capsulotomy between 1wk and 3mo post-laser. Between 3 and 12mo post-laser, only the group with 13 mm CTR showed a significant increase in the area of capsulotomy(P<0.01). ·CONCLUSION: Laser posterior capsulotomy is safe in all three groups. The capsulotomy and ACD become stabilized and have not shown significant changes since 1y postlaser, even with larger CTRs. The maintenance of centrifugal capsular tension can last longer with larger CTRs, and the stability of the capsulotomy site can be reached about 12mo after capsulotomy in pseudophakic eyes with larger CTRs.

β-Ga_(2)O_(3) junction barrier Schottky diode with NiO p-well floating field rings

Recently,β-Ga_(2)O_(3),an ultra-wide bandgap semiconductor,has shown great potential to be used in power devices blessed with its unique material properties.For instance,the measured average critical field of the vertical Schottky barrier diode(SBD)based onβ-Ga_(2)O_(3) has reached 5.45 MV/cm,and no device in any material has measured a greater before.However,the high electric field of theβ-Ga_(2)O_(3) SBD makes it challenging to manage the electric field distribution and leakage current.Here,we showβ-Ga_(2)O_(3) junction barrier Schottky diode with NiO p-well floating field rings(FFRs).For the central anode,we filled a circular trench array with NiO to reduce the surface field under the Schottky contact between them to reduce the leakage current of the device.For the anode edge,experimental results have demonstrated that the produced NiO/β-Ga_(2)O_(3) heterojunction FFRs enable the spreading of the depletion region,thereby mitigating the crowding effect of electric fields at the anode edge.Additionally,simulation results indicated that the p-NiO field plate structure designed at the edges of the rings and central anode can further reduce the electric field.This work verified the feasibility of the heterojunction FFRs inβ-Ga_(2)O_(3) devices based on the experimental findings and provided ideas for managing the electric field ofβ-Ga_(2)O_(3) SBD.

AusMed Brings Game-Changing Healthcare Innovations from Hong Kong,China to the World——An interview with Christine Yip,Founder and CEO of AusMed Global Limited

“As a non-invasive alternative to the traditional finger-prick blood ketone testing devices,boasting a high level of accuracy comparable to industrial gold standards typically attainable only through bulky and expensive specialty equipment,we proudly introduce the world’s first-of-its-kind handheld breath ketone(BrAce)analyser,empowered by our patented disruptive photonic sensing technologies.These innovations are aimed at providing a more effective approach to managing diabetes and ketosis(fat metabolism),”said Christine Yip,founder and CEO of AusMed Global Limited,during a recent interview with China’s Foreign Trade magazine.

Studying Tuff Rings and Volcanic Hazards in a Tropical Setting: The Case of the Batoke Tuff Ring, Limbe, SW Region Cameroon

In subtropical volcanic environments, there are often few accessible outcrops. These are often highly weathered and of very poor quality. Soil development is rapid (1 cm/y) and small eruptions are unlikely to be preserved in the geological record. Reconstructing past eruptions and assessing hazards is a challenge. Here, we studied a poorly outcropping tuff ring (very poor, incomplete sections) with the best outcrop observed at a beach cliff (up to ca. 5 - 10 m high) at Batoke, to the south of Mt Cameroon volcano. Mt Cameroon has a few tuff rings, currently of unknown ages, near the SW coast of Cameroon. In the Batoke case, the sequence is dominated by gently dipping tuff beds varying in the proportion of lithics, juvenile clasts, and accretionary lapilli (acc-laps). Several beds are close-packed with acc-laps of up to 10 - 15 mm diameter. Part of the section is gullied by mud flow deposits. The rocks are highly weathered but differential weathering enhances relationships. Quantitative data can be extracted from a detailed study of outcrops’ external surfaces. The preserved section is close to where the deposits were initially thickest and where acc-laps were most abundant and largest. There is an empirical correlation between maximum acc-lap size in the thickest outcrop and eruption column height. This and the deposit features suggest that the Batoke eruption was pulsating but dominated by fallout, with a water and ice-rich eruption column reaching 10 - 15 km high. Recycling of water drops and ice-coated fine ash accumulated during eruption. At switch off, wholesale gravitational collapse of this material produced the mud flows, which gullied the previously-laid down deposits. Such ash fall and mud flows can represent a substantial hazard, e.g. they can gully down through towns and roads and cut evacuation routes. This study illustrates how, at subtropical tuff rings, it is possible to extract key data needed for hazard assessment from only 1 - 2 poor outcrops.

Relative Ding Projective Modules over Formal Triangular Matrix Rings

Let U be a (B, A)-bimodule, A and B be rings, and be a formal triangular matrix ring. In this paper, we characterize the structure of relative Ding projective modules over T under some conditions. Furthermore, using the left global relative Ding projective dimensions of A and B, we estimate the relative Ding projective dimension of a left T-module.

Penile and scrotal strangulation by stainless steel rings in an human immunodeficiency virus positive man: A case report

BACKGROUND Penoscrotal constriction devices are either used as autoerotic stimuli or to increase sexual pleasure or performance by maintaining an erection for a longer period,and a variety of metallic and non-metallic objects are used.On the other hand,penile strangulation is a rare urologic emergency that requires prompt evaluation and intervention to prevent long-term complications.The goal of treating penile incarceration is to remove the foreign object as soon as possible.On the other hand,removal can be very challenging,and often requires resourcefulness and a multidisciplinary approach.CASE SUMMARY A 47-year-old man who has sex with men was transferred to our hospital for persistent phallodynia and scrotal pain,accompanying swelling due to strangulation by stainless steel rings.His medical history included acquired immunodeficiency syndrome.One day prior,he had put three stainless steel rings on his penis and scrotum before sexual intercourse.After sexual intercourse,he was unable to remove them,due to swelling of his penis and scrotum.The swelling persisted,and he felt pain in the affected area the next day,then he was transferred to our hospital by ambulance.The emergency department found that his penis and scrotum were markedly engorged and swollen.We established a diagnosis of penile and scrotal strangulation by stainless steel rings.We unsuccessfully attempted to cut the rings using a cutter,then requested a rescue team via emergency medical service.They cut through each ring in two places,using an electric-powered angle grinder,and successfully removed all of the pieces.Finally,he was discharged and went home.CONCLUSION We report the first case of penile and scrotal strangulation by stainless steel rings in an human immunodeficiency virus positive person.

An Introduction to the Theory of Matrix Near-Rings

Matrix rings are prominent in abstract algebra. In this paper we give an overview of the theory of matrix near-rings. A near-ring differs from a ring in that it does not need to be abelian and one of the distributive laws does not hold in general. We introduce two ways in which matrix near-rings can be defined and discuss the structure of each. One is as given by Beildeman and the other is as defined by Meldrum. Beildeman defined his matrix near-rings as normal arrays under the operation of matrix multiplication and addition. He showed that we have a matrix near-ring over a near-ring if, and only if, it is a ring. In this case it is not possible to obtain a matrix near-ring from a proper near-ring. Later, in 1986, Meldrum and van der Walt defined matrix near-rings over a near-ring as mappings from the direct sum of n copies of the additive group of the near-ring to itself. In this case it can be shown that a proper near-ring is obtained. We prove several properties, introduce some special matrices and show that a matrix notation can be introduced to make calculations easier, provided that n is small.

*-诣零McCoy环

研究了具有对合映射*-诣零McCoy环的性质,给出了一批*-诣零McCoy环例子,并讨论了其扩张和*-斜多项式环的*-诣零McCoy性,证明了(1)设*-环R满足nil(R[x])=nil(R)[x],则环R是*-诣零McCoy环当且仅当环R[x]是*-诣零McCoy环;(2)设R[x;*]是*-斜多项式环,如果R是*-可逆环,则R[x;*]是*-诣零McCoy环。

嵌入式系统环形缓冲区快速读写方法的设计与实现

针对常用环形缓冲区读写数据运行效率低的弊端,提出了一种快速读写环形缓冲区数据的方法。在读写缓冲区数据时,通过位与逻辑运算修改读写指针值,利用读写指针的差值作为缓冲区有效数据个数实现环形缓冲区状态判断。通过仿真测试实验和测试数据分析,这种快速读写环形缓冲区的方法可以显著提高系统运行效率。

渐近安全引力下的黑洞阴影和光环

重点讨论了薄盘吸积与渐近安全(asymptotically safe,AS)引力修正参数对黑洞阴影和光环的影响.对于薄盘吸积,黑洞的暗区就是黑洞的阴影,而明亮的光环则是由直接像、透镜环和光子环组成的.对于吸积盘辐射源比强度,考虑了3个不同辐射轮廓模型.对辐射起始于最内圆轨道的二阶衰减函数模型,直接像、透镜环和光子环可以明显区分.直接像对黑洞光环亮度贡献最大,透镜环对光环亮度贡献很小,而光子环的贡献几乎可以忽略,且对应观测强度的峰值随AS引力参数的增加而减小,即对应光环亮度随修正参数的增大而变暗.对于辐射起始于光子球半径的三阶衰减函数模型,透镜环和光子环叠加在直接像上,使观测强度出现新的极值.这一极值随AS引力修正参数的增加而增加,且使得黑洞光环的亮度更亮.对辐射起始于事件视界的反三角衰减函数模型,透镜环和光子环在直接像上的叠加范围更大,观测到的光环更宽,且AS引力参数值越小,透镜环和光子环越难区分,黑洞光环的亮度越大.总之,研究表明,黑洞阴影半径的大小随AS修正参数的增加而减小,对于不同的AS引力修正参数,辐射源光强度、尤其是观测强度的辐射轮廓存在显著差异,导致黑洞的阴影和亮环明显不同.

基于探测器响应机理的碳/碳构件CT图像环状伪影的校正方法

在碳/碳复合材料的计算机断层扫描(CT)中,由于探测器单元的响应非线性及不一致性导致重建图像出现严重的环状伪影,干扰图像中缺陷的检出,影响检测系统对被检构件的质量评价。结合碳/碳复合材料组分单一且密度均匀的特点,提出了一种基于探测器响应机理的CT图像环状伪影的校正方法,利用采集的劣化投影数据做预重建,对重建结果做阈值分割以获得被检测物体的三维模型。结合已知的材料和密度信息,对被检物体进行重投影,得到投影数据的理论值与实测值之间的映射关系,用于探测器响应校正以优化检测图像。与传统低通滤波的环状伪影校正方法相比,该方法考虑了环状伪影的物理成因并充分利用了检测对象的先验信息。研究结果表明,该校正方法在保留图像细节和纹理的同时,能够有效减少环状伪影,提升图像质量,消除伪影对于图形中缺陷识别的干扰,为提升检测系统对碳/碳复合材料构件缺陷的检出能力提供理论依据。

腹腔镜内环口缩小加高位结扎术治疗儿童复发斜疝的应用体会

目的:探讨腹腔镜内环口缩小加高位结扎术治疗儿童复发性腹股沟斜疝的临床效果。方法:回顾分析2021年5月至2023年1月行腹腔镜内环口缩小加高位结扎术的11例复发性腹股沟斜疝患儿的临床资料,男10例,女1例,平均(4.32±1.87)岁,其中1例为第二次复发,复发时间(首次手术至发现复发的时间)平均(5.3±2.4)个月。结果:11例患儿均为单侧复发,对侧内环口均已闭合。9例复发侧可见原手术结扎缝线,于原结扎线内侧见未闭合的内环口;2例未见原结扎缝线。11例手术均顺利完成,手术时间平均(31.3±8.6)min。患儿麻醉清醒后4~6 h进半流质饮食,术后第2天出院。术后均无明显并发症发生。术后随访5~24个月,平均(15.6±4.8)个月,经病史询问、体格检查及超声检查,均未见再次复发征象。结论:腹腔镜内环口缩小加高位结扎术治疗儿童复发性腹股沟斜疝具有创伤小、安全有效、操作简单、并发症少等优点,值得临床推广。

一种基于频差自校准的高精度RC振荡器

提出了一种基于频差自校准的高精度RC振荡器。通过对PTAT高频环形振荡器时钟计数,得到RC振荡器和参考时钟的计数偏差。数字自校准电路通过电阻阵列校准参考电压,减小计数偏差,进而得到稳定的振荡频率。参考时钟仅在工作前校准,实际工作中不需要额外的参考时钟。该RC振荡器采用CSMC 0.18μm工艺,工作电压为1.8 V。仿真结果表明,该电路可以产生2 MHz的稳定振荡频率,整个系统的功耗为48.4μW,启动时间小于15μs。在-40~125℃温度范围内,振荡频率变化率小于±0.2%。在1.70~1.98 V供电电压范围内,振荡频率变化率小于±0.25%/V。

多工位硅胶圈缺陷在线视觉检测系统研究

硅胶圈检测由于缺陷具有种类多、易变形、复杂性高等特点,通过提出多工位、多角度、不同打光方式结合的基于视觉的机电检测系统来解决这类产品的检测问题。整个检测系统的图像处理使用了基于OpenCV库按照实际项目需求进行改进,使用滤波算子、阈值分割和形态学方法。使用VGG16卷积神经网络训练模型在小样本条件对三种缺陷分类和传统视觉检测方法得到的准确率进行对照实验。在小样本下传统机器视觉的检测准确率>98%,优于深度学习的方法。通过Qt完成UI界面的设计。该软件系统使用多线程设计模式编写,并提出了一种多工位循环剔除新方法,具备在线检测计数和剔除功能。就一种特定的硅胶圈产品检测进行实际实验和测试,验证了本系统的可靠性和实用性。

囊袋张力环联合Toric人工晶状体植入治疗高度近视合并角膜散光的白内障

目的研究伴有角膜散光的高度近视白内障患者进行超声乳化+环曲面人工晶状体(Toric intraocular lens,Toric IOL)及囊袋张力环(capsular tension ring,CTR)植入术的临床效果及稳定性。方法通过回顾性研究,分析在武汉市第一医院行白内障超声乳化吸除术的高度近视伴有角膜散光的患眼54例(76眼),其中31例(38眼)联合植入Toric IOL及CTR(联合组),23例(38眼)单纯植入Toric IOL(对照组)。术后随访6个月,比较两组患者术前及术后视力、角膜内皮细胞密度、人工晶状体旋转度、残余散光度,以及并发症发生情况。结果术后6月,两组患者裸眼远视力(uncorrected distance visual acuity,UCVA)、最佳矫正视力(best corrected visual acuity,BCVA)均显著高于术前,联合组术后UCVA(LogMAR)优于对照组,差异有统计学意义[(0.34±0.15)vs.(0.46±0.25),P<0.05]。术后1周、1月、3月及6月,联合组散光分别为(0.38±0.31)、(0.45±0.25)、(0.47±0.23)、(0.56±0.26),均明显低于对照组各时间点(均P<0.01)。术后6月联合组IOL平均旋转(2.63±0.94)°,显著低于对照组的(4.00±1.43)°(P<0.01)。两组间各时间点角膜内皮细胞密度比较,差异无统计学意义(均P>0.05)。联合组术后并发症总发生率低于对照组(P<0.05)。结论对于高度近视伴角膜散光的白内障患者,术中植入Toric IOL的同时联合应用CTR,安全性好,能够改善Toric IOL旋转稳定性,提高视觉质量,并且减少并发症。

吉西他滨联合顺铂方案治疗复发性三阴性乳腺癌的疗效观察

目的:探究吉西他滨联合顺铂方案在蒽环、紫杉类药物治疗后复发性三阴性乳腺癌(TNBC)患者中的应用效果。方法:选取2019年1月~2021年1月期间某院收治的81例蒽环、紫杉类药物治疗后复发性TNBC患者作为研究对象,采用随机、单盲试验研究方法,依据随机数字表法分为A组(n=40)和B组(n=41)。A组患者给予注射用盐酸吉西他滨联合卡培他滨片治疗,B组患者给予注射用盐酸吉西他滨联合注射用顺铂治疗。比较两组临床疗效、血清肿瘤标志物[癌胚抗原(CEA)、糖类抗原153(CA153)、糖类抗原125(CA125)]水平变化、生活质量情况[欧洲癌症研究与治疗组织生命质量量表(EORTC QLQ-C30)]、不良反应发生情况及治疗后2年内患者的预后情况。结果:治疗后,B组治疗总有效率(82.93%)高于A组(60.00%,P<0.05)。两组血清CEA、CA153、CA125水平均降低(P<0.05),且B组低于A组(P<0.05)。两组EORTC QLQ-C30评分在疲劳、失眠方面均降低(P<0.05),且B组低于A组(P<0.05);两组EORTC QLQ-C30评分在总体健康方面均升高(P<0.05),且B组高于A组(P<0.05);两组EORTC QLQ-C30评分在恶心呕吐、食欲丧失、便秘方面比较无统计学差异(P>0.05)。两组患者治疗期间不良反应总发生率比较无统计学差异(P>0.05)。B组患者2年内复发率(14.63%)低于A组(40.00%,P<0.05),中位无进展生存期[(6.65±1.45)个月]长于A组[(4.26±1.23)个月,P<0.05],稳定病例数(58.54%)高于A组(30.00%,P<0.05)。结论:与吉西他滨联合卡培他滨相比,吉西他滨联合顺铂治疗方案在蒽环、紫杉类药物治疗后复发性TNBC患者中临床疗效更佳,可有效降低患者血清肿瘤标志物水平,提高生活质量,改善预后。

盾尾密封失效诱发砂土地基盾构管片环失稳坍塌研究

盾构管片环失稳坍塌案例时有发生,探究其失稳坍塌发生条件对于预防重大安全事故发生具有重要意义。基于Midas GTS建立30环考虑环缝螺栓作用的荷载−结构计算模型,从盾尾管片环地基掏空和盾尾姿态突变2个方面探讨盾构管片环结构失稳破坏过程及失稳坍塌的发生条件。结果表明:盾尾渗漏使盾尾壳体失去了周围地基的有效约束作用,盾尾发生前仰后俯的姿态变化,隧道结构发生横向“横鸭蛋”和纵向挠曲变形,最终导致部分管片环坍塌。盾尾下沉位移是诱发管片环失稳坍塌的主要因素,盾尾下沉导致隧道纵向变形快速发展,快于盾尾渗漏引起管片环周围地基掏空所导致的隧道纵向变形。当盾尾下沉位移大于0.50 m且掏空范围大于5环、盾尾下沉位移大于0.45 m且掏空范围大于10环、盾尾下沉位移大于0.40 m且掏空范围大于11环时,环缝最大张开量超过单根螺栓极限应力时的环缝张开量47.43 mm,部分纵向螺栓被拉断,管片外水土发生喷射,加快管片环外砂土快速流失。当盾尾下沉位移大于0.5 m且掏空范围大于9环时,环缝最大张开量超过65.2 mm,管片环椭圆率超过46.1‰,最终诱发多环管片环失稳坍塌。研究结果可为盾尾渗漏诱发的重大安全风险评判提供参考。

环端面不平整条件下衬砌管片抗剪承载特性研究

在衬砌管片拼装过程中难免出现环端面不平整(或环缝间垫片局部脱空)的情形,进而在顶推力作用下管片容易产生局部开裂破损,严重时甚至危及衬砌结构安全。鉴于此,以衬砌管片抗剪原型试验为基础,在ABAQUS数值分析平台上建立P2型标准块管片的精细化模型,管片上部设置千斤顶靴板,底部设置垫片并使右侧垫片脱空。在靴板上逐级施加均布荷载,以分析局部脱空情况下衬砌管片在逐级顶推力作用下的力学响应,探讨环端面不平整条件下衬砌管片的裂缝发展过程及抗剪承载特性。数值模拟结果表明:顶推力加载至850 kN,管片脱空端竖向位移达到2 mm,管片内弧面上部出现第1道裂缝,内置钢筋仍处于弹性阶段;加载至1120 kN,脱空端竖向位移达到6 mm,内弧面上出现2道新裂缝,同时第1道裂缝进一步扩展形成内外贯穿性裂缝,即管片裂缝发展过程大致为内弧面→上环端面→外弧面,且裂缝附近上层纵向钢筋达到屈服强度;考虑到内外贯穿裂缝给衬砌管片带来较大渗漏水隐患,认为P2型标准块管片的抗剪承载力(即屈服荷载)约为1120 kN。将数值模拟结果与原型试验结果进行对比,二者所得管片裂缝分布与扩展规律大致一致,抗剪承载力基本相符,验证了数值模拟结果的可靠性。研究成果可为盾构隧道的衬砌设计与掘进施工提供参考依据。