電大【工程地質(zhì)】形成性考核冊參考答案-閱讀頁
2025-06-23 10:37本頁面
【正文】 ：黏性土在水中崩散解體的性能，稱為土的崩解性，又稱濕化性。 它受到崩解時間的影響。土的崩解性也受土的粒度成分、礦物成分、水溶液的 PH 值、電解質(zhì)濃度和極化程度的影響。 2．天然平衡拱法圍巖應力的普氏 fk 方法的基本假定是什么？ 普氏 fk 方法的基本假定：洞室開挖后圍巖一部分砂體失去平衡而向下塌落，塌落部位以上和兩側(cè)砂體，處于新的平衡狀態(tài)而穩(wěn)定。若洞室側(cè)圍砂體沿斜面滑動，洞頂仍塌落后呈拱形。 3．敘述剪節(jié)理的主要特征。 四．論述題 1．地震的效應 在地震作用影響下，地面出現(xiàn)的各種震害 和破壞稱為地震效應。當建筑物經(jīng)受不住這種地震力的作用時，建（構(gòu)）筑物將會發(fā)生變形、開裂，甚至倒塌。這種振動具有很大的能量，它以作用力的方式作用于巖石上，當這些作用力超過了巖石的強度時，巖石就要發(fā)生突然破裂和位移，形成斷層和地裂縫，引發(fā)建（構(gòu)）筑物變形和破壞。 地震激發(fā)地質(zhì)災害的效應：強烈的地震作用能激發(fā)斜坡上巖土體松動、失穩(wěn)，發(fā)生滑坡和崩塌等不良的地質(zhì)現(xiàn)象。s 72hour visafree policy has attracted wide attention from both Chinese and foreign experts and businessmen since it took effect on Sept 1 last year. The program permits citizens from 51 countries and regions including the United States, Australia, Canada and Japan who have valid visas and flight tickets to a third country to spend three days in the city. The capital of Sichuan province is the first city in the western region of China to offer foreign tourists a threeday visa and the fourth nationwide to adopt the policy following Shanghai, Beijing and Guangzhou. Li Zhiyong, deputy dean of the tourism institute at Sichuan University, said the move contributes to a large increase in the number of overs eas tourists and raises the city39。s largest breeding and research center. Three days are long enough for foreign visitors to visit those iconic tourist spots, he noted. The city is home to the remains of the Jin sha civilization that dates back more than 3,000 years as well as the Qing cheng Mountains and the Du jiang yan irrigation system. Qing cheng has long been recognized as the birthplace of Taoism, China39。s business development. Rudy Buttignol, president of the public broadcasting pany in British Columbia, Canada, said his work requires frequent tra vel to Chengdu and the policy makes the trips easier. Data from the city39。s cooperation with Central Asian countries, a senior official said. Shaanxi Governor Lou Qinjian said the province is fresh, rich and unique, as it was when it anchored one end of the ancient Silk Road. It is the best option for acmodating industrial transfers from East China or the world at large, he said on Wednesday in Xi39。an, the starting point of the ancient Silk Road, a trade channel established more than 2,000 years ago linking China, Central Asia and Europe.
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