Urban construction activity is the main cause of land subsidence in Chengdu www.cpew.cn

City construction activity is caused by the red main cause of land subsidence in Chengdu is the deformation rate of the place, the Green strain rate is small, yellow is the strain rate in the middle of nowhere (Longmen Mountain Fault Zone) in settlement to represent the deformation rate in the monitoring period lasted for two years in Mianyang City, Leshan City, Dujiangyan city overall settlement quantity, Chengdu’s annual settlement is the largest volume of 2.2 cm per year, the minimum is -2.8 cm. Chasing the reason, Sun Xiaopeng said: "the main cause of land subsidence in Chengdu is human reason, that is, the development of real estate and the construction of the subway." In recent years, Chengdu has built a subway line every year to speed up the construction of the subway, at the same time, the construction of real estate is also very rapid. These frequent and active urban construction activities are the main causes of land subsidence in Chengdu. Through monitoring, it is found that the area deformation rate of the subway passing through is obviously higher than that of other areas. "A concave feeling is formed, and the subway line will have a larger ground subsidence after the shield". On the other hand, because of the high-rise building construction, the ground construction needs pumping groundwater, at the same time, after the building is completed, the building will have self weight, but also cause the ground subsidence. Sun Xiaopeng said that the subsidence rate from west to east gradually increased in Chengdu plain. In this regard, Sun Xiaopeng gave a scientific explanation. He introduced, this may mainly exist in 3 aspects: Chengdu plain is in the squeeze environment, the west side of Chengdu by the impact of thrusting upward trend, the eastern side of the subsidence trend. The groundwater from the west to the east of Chengdu changes from rich water area to poor water area, and the decrease of groundwater will lead to subsidence. In the east of Chengdu City, especially in Longquanyi District, the real estate development activities are frequent in recent years, and the new construction projects increase the carrying capacity of the ground, which is easy to induce settlement. Therefore, the superposition of the three factors leads to the pattern of westward rising and falling eastward. In recent years, Chengdu metro construction activities are active, along the construction of the subway construction line, showing a very obvious subsidence trend. The annual subsidence data of Chengdu are mainly located between -1.4 cm and 0.05 cm." Sun Xiaopeng said, "so in general, the shape variable of Chengdu is small, and its land subsidence is within the scope of safety."

城市建设活动是造成成都地面沉降的主要原因 红色是形变速率大的地方,绿色形变速率小,黄色是形变速率中间的地方(龙门山断裂带)   以年沉降量来表示形变速率,在历时两年的监测时段内,绵阳市、乐山市、都江堰市主城区总体沉降量不大,成都的年沉降量最大的是2.2厘米 每年,最小的是-2.8厘米。   追其原因,孙晓鹏说:“主要造成成都市地面沉降的原因是人为原因,就是房地产的开发和地铁的修建。”近年来,成都以每年新开建一条地铁线路的速度在进行地铁的建设,同时房地产的建设也非常迅速。这些频发活跃的城市建设活动是造成成都地面沉降的主要原因。   通过监测发现,地铁穿过的地区形变速率要明显的高于其他地区,“形成一个凹的感觉,地铁线路在盾构之后会有一个较周围更大的地面沉降”。另一方面,由于高层建筑物建设,地基施工需要抽地下水,同时,建筑建成之后楼会有自重,也是造成地面沉降的原因。   孙晓鹏说,成都平原自西向东沉降速率逐渐增大。   对此,孙晓鹏给予了科学的解释。他介绍,这主要可能存在3个方面的原因:   ——成都平原处于挤压环境中,成都西侧受逆冲作用的影响呈现抬升趋势,东侧呈现沉降趋势。   ——成都自西向东地下水由富水区变为贫水区,地下水量的减少同样会导致沉降。   ——成都市东侧,尤其龙泉驿区近年房地产开发活动频繁,新建楼盘增加地面承载负荷,易诱发沉降。因此,三重因素叠加导致呈现西抬东降的格局。近年成都地铁建设活动活跃,沿在建地铁施工线路,呈现十分明显的沉降趋势。   “成都年沉降量数据主要位于-1.4厘米和0.05厘米之间。”孙晓鹏说,“所以总体来说,成都市形变量是小的,其地面沉降是处于安全范围内的。”相关的主题文章: