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一 | 人民网北京4月19日电 (记者王仁宏)近日,经过136辆总重约5000吨的大货车组的重压测试,中交二航局参建的深中通道伶仃洋大桥完成动静载试验,这是世界首次在全离岸海中超大跨径悬索桥上完成的荷载试验。此前,深中通道中山大桥、非通航孔引桥已完成荷载试验。

二 | On a balmy summer day in mid-August of 2021, the 20-year US-led nation-building project in Afghanistan came to an abrupt end. Following a 10-day blitzkrieg offensive in which the Taliban* captured 32 of the country’s 34 provinces with little resistance, the militants encircled and then entered Kabul and caused its government to flee, all while US and coalition forces, diplomats, and intelligence agents were still evacuating.,Afghanistan has been mired in foreign-backed civil conflict for generations, with the US-led invasion of the country in 2001 ensuing 23 years after the CIA kicked off Operation Cyclone - a covert action involving the deployment of jihadist fighters and tens of billions of dollars’ worth of weapons and cash to Afghanistan to fight a fledgling Soviet-backed government.,“We have to look at the history – the United States created the Afghan mujahedeen against the Soviet Union, when the Soviet Union came to help Afghanistan…That Islamic fundamentalism which includes Taliban, Mujahideen, ISIS [Daesh]** and others was created by the West,” says Dr. Zalmay Gulzad, a specialist on Afghan politics and professor of social sciences at Harold Washington College in Chicago.,WorldA Tale of Two Withdrawals: Why Soviet and US Pull-Outs From Afghanistan Were So Different18 August 2021, 04:00 GMT,In the mid-1990s, a few years after the end of the Cold War, Zbigniew Brzezinski, national security advisor to President Jimmy Carter, boasted that the overarching goal of the US project in Afghanistan was to “make the Soviets bleed for as much and as long as is possible,” and to coordinate with the intelligence services from the UK, Pakistan, Saudi Arabia, and other countries to make this happen.,Over four decades on, this strategy remains central to Washington’s calculations, Dr. Gulzad says, comparing US attempts to now use the Taliban to stir up trouble along Russia’s soft underbelly in Central Asia to the NATO proxy conflict against Moscow in Ukraine. Iran is another major target of US geopolitical ambitions, and Washington would like to play on the differences between the Sunni Taliban and the Shia Iranian state to “create problems” for the Islamic Republic, the academic argues.,Taliban Promise Safety for Resistance Leaders Including Ahmad Massoud as They Meet in Tehran10 January, 13:57 GMT,Graveyard of Empires,Brown University’s Costs of War project has calculated that the War in Afghanistan cost the United States alone more than $2.3 trillion, equivalent to $300 million per day for nearly 20 straight years. Notwithstanding the extravagant spending, and the rotational deployment of over 800,000 US troops and tens of thousands of personnel from over three dozen allied nations over the past generation, the Afghanistan project, once described by Harvard academic and chickenhawk Michael Ignatieff as a “humanitarian” “nation-building lite” adventure, has failed spectacularly.,The causes are legion, ranging from the pervasive corruption of Afghanistan’s political institutions and security structures (whose true fragility was demonstrated in August 2021), to the coalition’s tolerance for and even cooperation with unsavory warlords, drug traffickers, and even child sex criminals, and the imperious nature of the Western-backed project itself.,“It was a lost battle from the beginning,” says Dr. Swasti Rao, an associate fellow at the Europe and Eurasia Center at the Manohar Parrikar Institute for Defense Studies and Analyses in New Delhi.,US 'Lost Track' of Afghan War Aims, Says Retired Marine General12 August, 17:00 GMT,“One of the problems with the US is that it wishes to see the entire world in its own mirror image, what is called the liberal world order comprising of free market and democracy. This approach has a problem when enforced top down without taking account the regional and grassroots realities, cultural sensibilities of the people at hand. The government of Ashraf Ghani was never a popular government with massive charges of corruption that the Afghan people did not identify with,” Rao explains.,The researcher noted that all around the world, but in West Asia in particular, the “project of the liberal order of which the US considers itself a custodian” has met with failure.,“After 20 years, about $2.5 trillion and the lives of its citizens and soldiers, the US realized that retreating is the best possible decision, something they had been planning for a long time,” Rao says.,Challenges, Opportunities,A year on from Kabul’s fall, the situation in Afghanistan is unstable, unpredictable, and dangerous, both for ordinary Afghans and for countries in the region.,“After one year of the US withdrawal from Afghanistan and the Taliban takeover, it is Afghans who are suffering more than any other regional or extra-regional states,” says Shreyas Deshmukh, a researcher with the National Security Program at Delhi Policy Group, an India-based think tank.,“Now it is evident that the Taliban has not given up its extremist tendencies and will continue to stick with its interpretation of the extremist Sharia-based governance model. They do not have any concrete ideas to govern the state because [the Taliban] is a primarily insurgent organization. Therefore, anti-social elements including other terrorist organizations, drug lords, and human traffickers [have been] taking advantage of this vacuum. During the initial months after the Taliban takeover, the level of violence was reduced but now there is an uptick, as anti-Taliban forces are regrouping,” Deshmukh notes.,AfghanistanTaliban Militants Fire Into Air to Disperse Women's Protest in Kabul - Videos13 August, 07:44 GMT,The researcher points to an important dilemma for the Taliban: whether to make concessions on its governance model in exchange for cooperation with, assistance from, and possible recognition from other countries. Such a decision, Deshmukh notes, would carry with it the risk of heightening divisions within the Taliban’s ranks and even raise the possibility of their government’s collapse and renewed civil war. “On the contrary, if they implement a strict interpretation of Sharia law while going against international norms then the country will once again become a haven for terrorist organizations,” he warns.,Dr. Rao concurs with this pessimistic appraisal of Afghanistan’s internal situation, noting that while the Taliban proved capable of taking over from the Western-backed government, “they do not know how to engage in governance per se, let alone [create an] inclusive government with minorities and women. It’s been a year of denial of women’s rights, media crackdown, and retaliatory killings amid mass hunger. Especially with the Taliban bringing back the feared Ministry for the Promotion of Virtue and the Prevention of Vice, enforcing the group’s austere interpretation of Islam, it is more unlikely that women or minorities might have a say in the government any time in the foreseeable future,” he says.,Worse yet, Rao says, if the situation continues to fester, it will cause “even more unrest, drugs and illegal weapons smuggling, bloody fights between various fundamentalist groups like ISIS-K and the Taliban; in short a situation that will remain a regional security [concern] with uncontrolled global ramifications.”,The scholar emphasizes that the international community has asked the Taliban to form an inclusive government, ensure the rights of women and minorities, and guarantee that Afghanistan will no longer serve as a launch pad for global terror operations. “Unless that happens, the trade or investment promised by China will not flow. It is important to note that even Russia and China, which share a better equation with the Taliban compared to the Western world, have not recognized their government,” Rao believes.,WorldLithium, Gold & Rare Earths: How China May Open the Door to New Business Opportunities for Afghans19 August 2021, 08:38 GMT,At the same time, the researcher notes that although the US withdrawal exacerbated regional chaos, landed sophisticated weapons in Taliban hands, and created a regional power vacuum, it also “created space for countries like Russia, China and Iran to play a far more decisive role in the region,” as Washington shifted its attention to Eastern Europe and China.,Deshmukh concurs. “The Taliban is not a designated terrorist organization by many states including the US. However, its leadership is under UNSC and US sanctions. The real question is, will the countries recognize the Taliban regime in the near future? China, Pakistan, Russia, and Qatar have given some signals that they might recognize the regime. However, it remains a risky business considering that the Taliban is continuing close cooperation with terrorist organizations like AQ, Tehrik-e-Taliban Pakistan and Lashkar-e-Taiba. Many of their leaders have taken safe haven in Afghanistan.”,“No country would like to align itself with this regime and recognize them, for now. Meanwhile, they will continue to engage with the Taliban to provide humanitarian assistance to Afghans, keep a tab on terrorist elements which could threaten the national interest of those countries, and further to reap some economic benefits from Afghanistan,” Deshmukh concludes.,* A group under United Nations sanctions for terrorist activities.,** A terrorist group outlawed in Russia and many other countries.。深中通道桥梁工程顺利通过“大考”,朝着今年6月具备通车条件又迈进关键一步。深中通道是世界级“桥、岛、隧、水下互通”跨海集群工程,全长约24公里。其中,桥梁工程总长约17公里,包括伶仃洋大桥(悬索桥)、中山大桥(斜拉桥)和非通航孔引桥。荷载试验是大桥通车前必须经历的关键环节,分为静载试验和动载试验。通过等效模拟通车后的荷载情况,现场测试桥梁各部位的反应数据,判断桥梁承载能力是否符合设计要求和相关规范要求,为今后长期健康监测提供初始数据,也为日后养护、管理的决策提供科学依据和支持。

三 | 据悉,在最大荷载工况的伶仃洋大桥静载试验过程中,136辆总重约5000吨大货车分批行驶上桥,按照17行×8列的要求停放在桥面预先划定的停靠点,进行分级加载,实测主梁、主塔、主缆和吊索的位移和应变,并与理论值进行比较,从而评估桥梁工作性能。在动载无障碍行车试验中,两辆满载共70吨、相当于约45辆小汽车重量的载重卡车,以每小时10至60公里不等的时速在大桥上匀速行驶,通过布置在中跨中断面的动应变传感器,测试结构在行车荷载作用下的动力反应,分析得到桥梁的冲击系数。“从目前掌握的数据来看,深中通道伶仃洋大桥、中山大桥、非通航孔引桥的实测值均小于理论值,且大部分指标富余较大。

四 | 这意味着,深中通道桥梁工程不仅通过‘体检’,还可以说是在‘体能达标测试’中取得了不错的成绩。”广东交通集团深中通道管理中心副主任姚志安表示。

五 | 目前,深中通道的机电、交安、路面、房建附属等工程正在全力推进,为6月具备通车条件冲刺。项目建成通车后,深圳至中山的车程将从目前的约2小时缩短至30分钟内。

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