Liquefaction Hazard Analysis

Protecting Your Building From the Ground Up — Before the Ground Moves

When an earthquake strikes, the greatest threat to a building is often not the shaking itself — it is the ground beneath it suddenly losing its strength and behaving like a liquid. Soil liquefaction has caused catastrophic structural failures, building settlements, and foundation collapses in earthquake-affected regions across the world, including Bangladesh. Envision Group’s Liquefaction Hazard Analysis service gives building owners, developers, and engineers a precise, scientifically grounded assessment of their site’s liquefaction susceptibility — and the engineering solutions needed to eliminate that risk before construction begins.

Liquefaction Is Silent, Sudden & Devastating — Unless You Know It Is Coming

Bangladesh sits in one of the most seismically active regions of South Asia. Loose, saturated sandy soils — which are widespread across much of the country’s deltaic landscape — are particularly vulnerable to liquefaction during seismic events. Yet the majority of buildings constructed across Bangladesh have never been assessed for liquefaction risk, leaving them quietly exposed to a hazard that can cause complete structural failure within seconds of a significant earthquake.

At Envision Group, our liquefaction hazard analysis goes beyond simply flagging a risk — we quantify it, map it, and design engineering solutions that directly address it. Using field investigation data, laboratory soil testing, and internationally recognized liquefaction assessment methodologies, we give every client a clear, evidence-based picture of their site’s seismic ground risk and a practical path to making it safe.

Site-specific seismic hazard & peak ground acceleration assessment
Soil liquefaction susceptibility screening & trigger analysis
SPT & CPT based liquefaction potential index calculation
Lateral spreading, settlement & structural impact assessment
Ground improvement & foundation mitigation design recommendations

Every liquefaction hazard analysis we deliver transforms an invisible, poorly understood seismic ground risk into a clearly quantified, professionally managed engineering challenge — giving your project the protection it needs long before the ground ever has a chance to move.

Science-Driven Assessment Tools for Reliable Seismic Ground Risk Evaluation

Accurate liquefaction hazard analysis demands a rigorous combination of seismic data, subsurface investigation, laboratory testing, and internationally validated assessment frameworks. Our geotechnical team applies the full depth of modern liquefaction engineering science to every site we assess — using field data and analytical tools that produce results engineers and authorities can rely on. Our capabilities allow us to:

Determine site-specific seismic hazard parameters from regional seismicity data and ground motion models
Apply SPT and CPT based simplified procedure methods to calculate liquefaction factor of safety at every soil layer
Compute liquefaction potential index values to classify overall site liquefaction severity and structural risk
Model post-liquefaction ground deformation, lateral spreading potential, and building settlement impacts

The combination of rigorous field data, validated analysis methods, and experienced engineering judgment produces liquefaction assessments that are technically robust, practically useful, and fully aligned with current international standards and BNBC 2020 seismic design requirements.

How We Assess, Quantify & Mitigate Your Site's Liquefaction Risk

A systematic, science-based liquefaction assessment process that moves from seismic hazard characterization to ground risk quantification and practical mitigation design — giving your project complete protection against one of construction’s most underestimated natural hazards.

Seismic Hazard Characterization

We begin by establishing the seismic hazard context for your site — reviewing regional seismicity records, fault locations, historical earthquake data, and ground motion attenuation models to determine the design peak ground acceleration and earthquake scenarios that will govern the liquefaction assessment.

Subsurface Investigation & Soil Profiling

We conduct or review a targeted geotechnical investigation program — including borehole drilling, standard penetration testing, and cone penetration testing — specifically designed to characterize the loose, saturated sandy soil layers that carry the greatest liquefaction susceptibility across the full depth of interest.

Liquefaction Triggering Analysis

Using SPT and CPT data collected from the site investigation, we apply internationally recognized simplified procedure methods to calculate the cyclic stress ratio imposed by the design earthquake and compare it against the cyclic resistance ratio of each soil layer — determining the factor of safety against liquefaction triggering at every depth across the site.

Liquefaction Consequence Assessment

Where liquefaction triggering is predicted, we assess the engineering consequences for the site and structure — calculating post-liquefaction ground settlement, evaluating lateral spreading potential on sloped or waterfront sites, and estimating the structural damage implications for the proposed foundation system.

Liquefaction Potential Index & Risk Classification

We integrate the layer-by-layer liquefaction analysis results into an overall liquefaction potential index calculation for the site — classifying the overall ground liquefaction severity and providing a clear, quantified risk rating that engineers, developers, and authorities can directly use in foundation design and risk management decisions.

Mitigation Design & Engineering Recommendations

Where unacceptable liquefaction risk is identified, we develop targeted engineering mitigation recommendations — covering ground improvement options such as sand compaction piles, stone columns, and densification techniques, as well as foundation system adaptations including deep pile foundations and mat foundation designs — providing a practical, costed, and technically justified path to making the site safe for the planned construction.