减压降水诱发地表沉降规律及其预测方法
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摘要
为合理预测减压降水引起的地表沉降量及其分布,实测了上海某深基坑工程群井抽水试验引起的观测井水头降深和地表沉降,分析了地表沉降的分布和变化规律,并引出场地的等效综合模量来建立承压含水层水位降深与相应地表点沉降之间的对应关系。将等效综合模量和渗流场的数值模拟相结合,提出了减压降水诱发地表沉降的预测方法。
In order to predict the value and the distribution of the settlement,drawdown of the observation well and ground settlement are measured which are induced by borehole pumping test of a deep foundation excavation in Shanghai. The distribution of the ground settlement during pumping test is analyzed and a synthesize modulus is introduced to establish the relationship between the ground settlement and the drawdown in corresponding site. Combining the synthesize modulus and a numerical simulation for the seepage field a method is established to predict the ground settlement induced by dewatering of confined water.
In order to predict the value and the distribution of the settlement,drawdown of the observation well and ground settlement are measured which are induced by borehole pumping test of a deep foundation excavation in Shanghai. The distribution of the ground settlement during pumping test is analyzed and a synthesize modulus is introduced to establish the relationship between the ground settlement and the drawdown in corresponding site. Combining the synthesize modulus and a numerical simulation for the seepage field a method is established to predict the ground settlement induced by dewatering of confined water.
引文
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[11]王建秀,吴林高,朱雁飞,等.地铁车站深基坑降水诱发沉降机制及计算方法[J].岩石力学与工程学报,2009(5):1010-1019.
[2]李国和,张建民,张嘎,等.水井抽水引起地基沉降影响范围探讨[J].铁道工程,2014,31(12):23-27.
[3]骆冠勇,潘泓,曹洪,等.承压水减压引起的沉降分析[J].岩土力学,2004(S2):196-200.
[4]龚晓南,张杰.承压水降压引起的上覆土层沉降分析[J].岩土工程学报,2011(1):145-149.
[5]曾婕,王旭东.考虑含水层非稳定流的弱透水层一维固结解答[J].南京工业大学学报(自然科学版),2012,(2):85-90.
[6]王春波,丁文其,刘文军,等.非稳定承压水降水引起土层沉降分布规律分析[J].同济大学学报(自然科学版),2013,41(3):361-367.
[7]李文广,胡长明.深基坑降水引起的地面沉降预测[J].地下空间与工程学报,2008,4(1):181-184.
[8]许胜,缪俊发,娄荣祥.承压水降水引起周边环境变形的粘弹性分析[J].地下空间与工程学报,2010,6(1):213-218.
[9]叶为民,万敏,陈宝,等.深基坑承压含水层降水对地面沉降的影响[J].地下空间与工程学报,2009(S2):1799-1805.
[10]唐益群,朱雁飞,王建秀,等.地铁车站抽水试验引起的地面沉降效应分析[J].工程地质学报,2007(S1):412-417.
[11]王建秀,吴林高,朱雁飞,等.地铁车站深基坑降水诱发沉降机制及计算方法[J].岩石力学与工程学报,2009(5):1010-1019.